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| smsc usb251x hub family datasheet revision 1.1 (04-26-10) datasheet product features usb2512/12a/12b usb2513/13b usb2514/14b usb2517 usb 2.0 hi-speed hub controller general description the smsc usb251x hub is a family of low-power, oem configurable, mtt (multi transaction translator) 1 hub controller ic products for embedded usb solutions. the ?x? in the part number indicates the number of downstream ports available. the smsc hub supports low-speed, full-speed, and hi-speed (if operating as a hi- speed hub) downstream devices on all of the enabled downstream ports. for a summary of the products documented in this datasheet, please refer to the chapter 1, "usb251x hub family differences overview," on page 7 . highlights ? high performance, low-power, small footprint hub controller ic with 2, 3, 4, or 7 downstream ports (indicated by the ?x? in the part number) ? fully compliant with the usb 2.0 specification ? enhanced oem configuration options available through either a single serial i 2 c ? eeprom, or smbus slave port ? multitrak tm ? high-performance multiple transaction translator which provides one transaction translator per port ? portmap ? flexible port mapping and disable sequencing ? portswap ? programmable usb differential-pair pin locations ease pcb design by aligning usb signal lines directly to connectors ? phyboost ? programmable usb signal drive strength for recovering signal integrity using 4-level driving strength resolution features ? usb251xb/xbi products are fully footprint compatible with usb251x/xi/xa/xai products as direct drop-in replacements ? cost savings include using the same pcb components and application of usb-if compliance by similarity ? full power management with individual or ganged power control of each downstream port ? fully integrated usb termination and pull-up/pull- down resistors ? supports a single external 3.3 v supply source; internal regulators provide 1.2 v or 1.8 v internal core voltage ? onboard 24 mhz crystal driver, ceramic resonator, or external 24/48 mhz clock input ? customizable vendor id, product id, and device id ? 4 kilovolts of hbm jesd22-a114f esd protection (powered and unpowered) ? supports self- or bus-powered operation ? usb251xb and usb251xbi products support the usb battery charging specification rev. 1.1 for charging downstream ports (cdp) ? lead-free rohs compliant packages: ? 36-pin qfn (6x6 mm) ? 48-pin qfn (7x7 mm) ? 64-pin qfn (9x9 mm) ? usb251xi, usb2512ai, and usb251xbi products support the industrial te mperature range of -40oc to +85oc ? usb251xb products support the extended commercial temperature range of 0oc to +85oc applications ? lcd monitors and tvs ? multi-function usb peripherals ? pc motherboards ? set-top boxes, dvd players, dvr/pvr ? printers and scanners ? pc media drive bay ? portable hub boxes ? mobile pc docking ? embedded systems 1.usb2512a/ai only uses a single transaction translator.
order numbers: this product meets the halogen maximum concentration values per iec61249-2-21. for rohs compliance and enviro nmental information, plea se visit www.smsc.com/rohs. order numbers lead-free rohs compliant package package size temperature range usb2512-aezg usb2512a-aezg usb2513-aezg usb2514-aezg 36qfn 6 x 6 x 0.5 mm 0oc to 70oc usb2512b-aezg usb2513b-aezg usb2514b-aezg 0oc to 85oc usb2512i-aezg usb2512ai-aezg usb2512bi-aezg usb2513i-aezg usb2513bi-aezg usb2514i-aezg usb2514bi-aezg -40oc to 85oc usb2513-hzh usb2514-hzh 48qfn 7 x 7 x 0.5 mm 0oc to 70oc usb2513i-hzh usb2514i-hzh -40oc to 85oc usb2517-jzx 64qfn 9 x 9 x 0.5 mm 0oc to 70oc usb2517i-jzx -40oc to 85oc usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 2 smsc usb251x datasheet 80 arkay drive, hauppauge, ny 11788 (631) 435-6000, fax (631) 273-3123 copyright ? 2010 smsc or its subsidiaries. all rights reserved. circuit diagrams and other information relating to smsc produc ts are included as a means of illustrating typical applications. consequently, complete information sufficient for construction purposes is not necessarily given. although the information has been checked and is believed to be accurate, no re sponsibility is assumed for inaccuracies. smsc reserves the right to make changes to specifications and produc t descriptions at any time without notice. contact your local sm sc sales office to obtain the latest specifications before placing your product order. the provision of this inform ation does not convey to the purchaser of the described semicond uctor devices any licenses under any patent rights or other intellectual property rights of smsc or others. all sales are expressly conditional on your agreement to the te rms and conditions of the most recently dated version of smsc's standard terms of sale agreement dated before the date of your order (the "terms of sale agreement"). the pro duct may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. anomaly sheets are availab le upon request. smsc products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. any and all such uses without prior written approval of an officer of smsc and further testing and/or modification will be fully at the risk of the customer. copies of this document or other smsc literature, as well as the terms of sale agreement, may be obtained by visiting smsc?s website at h ttp://www.smsc.com. smsc is a registered trademark of standard microsystems corporation (?smsc?). product names and company names are the trademarks of their respective holders. smsc disclaims and excludes any and all warranties, including without limitation any and all implied warranties of merchantabil ity, fitness for a particular purpose, title, and against infringement and the like, and any and all warranties arising from any cou rse of dealing or usage of trade. in no event shall smsc be liable for any direct, incidental, indirect, special, punitive, or cons equential damages; or for lost data, profits, savings or revenues of any kind; regardless of the form of action, whether based on contrac t; tort; negligence of smsc or others; strict liability; breach of warranty; or otherwise; whether or not any remedy of buyer is h eld to have failed of its essential purpose, and whether or no t smsc has been advised of the possibility of such damages. usb 2.0 hi-speed hub controller datasheet smsc usb251x 3 revision 1.1 (04-26-10) datasheet table of contents chapter 1 usb251x hub family differences overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 chapter 2 general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 chapter 3 acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 chapter 4 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 chapter 5 pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 5.1 pin configurations and lists (organiz ed by package type) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.2 usb251x pin descriptions (grouped by f unction). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.3 buffer type descriptio ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 chapter 6 led usage description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.1 led functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.1.1 usb mode 14-wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.1.2 led mode speed indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 chapter 7 battery charging support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 7.1 general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 7.2 usb battery charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 7.2.1 special behavior of prtpwr pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 7.3 battery charging configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 7.3.1 battery charging enabled via eeprom or smbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 chapter 8 configuration options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 8.1 hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 8.1.1 hub configuration options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 8.1.2 smbus or eeprom interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 8.1.3 vbus detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 8.2 eeprom interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 8.2.1 internal register set (common to eeprom and smbu s) . . . . . . . . . . . . . . . . . . . . . . . 35 8.2.2 i 2 c eeprom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 8.2.3 in-circuit eeprom programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 8.3 smbus slave interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 8.3.1 smbus slave addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 8.3.2 bus protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 8.3.3 invalid protocol response behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 8.3.4 general call address response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 8.3.5 slave device time-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 8.3.6 stretching the sclk signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 8.3.7 smbus timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 8.3.8 bus reset sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 8.3.9 smbus alert response address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8.4 default configuration option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8.5 default strapping options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8.6 strap options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8.6.1 non-removable strap option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8.6.2 internal pull-down (ipd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 8.6.3 led strap option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 8.7 reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 4 smsc usb251x datasheet 8.7.1 external hardware r eset_n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 8.7.2 usb bus reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 chapter 9 dc parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 9.1 maximum guaranteed ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 9.2 operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 9.2.1 package thermal specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 chapter 10 ac specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 9 10.1 oscillator/crystal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 10.2 ceramic resonator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 10.3 external clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 10.3.1 smbus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 10.3.2 i 2 c eeprom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 10.3.3 usb 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 chapter 11 package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1 11.1 tape and reel specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 usb 2.0 hi-speed hub controller datasheet smsc usb251x 5 revision 1.1 (04-26-10) datasheet list of tables table 1.1 36-pin qfn (6x6x0.5 mm) rohs compliant part numb ers . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 1.2 48-pin qfn (7x7x0.5 mm) rohs compliant part numb ers . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 1.3 64-pin qfn (9x9x0.5 mm) rohs compliant part numb ers . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 2.1 summary of compatibilities between usb251xb/xbi and usb251x/ xi/xa/xai products. . . . . . 9 table 5.1 pin list in alphabetical order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 5.2 usb251x pin descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 5.3 buffer type descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 8.1 hub configuration options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 table 8.2 internal default, eeprom and smbus register memory map. . . . . . . . . . . . . . . . . . . . . . . . 35 table 8.3 portmap register for ports 1 & 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 table 8.4 portmap register for ports 3 & 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 table 8.5 portmap register for ports 5 & 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 table 8.6 portmap register for port 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 table 8.7 summary of strap options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 table 8.8 reset_n timing for default/strap option mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 table 8.9 reset_n timing for eeprom mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8 table 8.10 reset_n timing for smbus mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 table 9.1 dc electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 table 9.2 supply current unconfigured: hi-speed host (iccinths) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 table 9.3 supply current unconfigured: full-speed host (iccintfs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 table 9.4 supply current configured : hi-speed host (ihch1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 table 9.5 supply current configured: full-speed host (ifcc1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 table 9.6 usb251x/xi/xa/xai supply current suspend (icsby). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 table 9.7 usb251xb/xbi supply current suspend (icsby) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 table 9.8 usb251x/xi/xa/xai supply current reset (icrst) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 table 9.9 usb251xb/xbi supply current reset (icrst) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 table 9.10 pin capacitance for usb251x, usb251xi, usb251 xa, usb251xai . . . . . . . . . . . . . . . . . . . . 67 table 9.11 pin capacitance for usb251xb and usb251xbi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 table 9.12 package thermal resistance parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 table 9.13 legend. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 table 10.1 crystal circuit legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 table 11.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 6 smsc usb251x datasheet list of figures figure 4.1 usb251x hub family block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 figure 5.1 2-port 36-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 5.2 3-port 36-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 5.3 4-port 36-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 5.4 3-port 48-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 5.5 4-port 48-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 5.6 7-port 64-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 6.1 dual color led implementation exam ple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 figure 7.1 battery charging via external power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 figure 8.1 block write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 figure 8.2 block read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 figure 8.3 non-removable pin strap example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 figure 8.4 pin strap option with ipd pin example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 figure 8.5 led pin strap example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 figure 8.6 reset_n timing for default/strap option mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 figure 8.7 reset_n timing for eeprom mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8 figure 8.8 reset_n timing for smbus mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 figure 9.1 supply rise time model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 figure 10.1 typical crystal circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 figure 10.2 formula to find the value of c1 and c2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 figure 10.3 ceramic resonator usage with smsc ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 figure 11.1 36-pin qfn, 6x6 mm body, 0.5 mm pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 figure 11.2 48-pin qfn, 7x7 mm body, 0.5 mm pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 figure 11.3 64-pin qfn, 9x9 mm body, 0.5 mm pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 figure 11.4 36-pin package tape specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 figure 11.5 48-pin package tape specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 figure 11.6 36-pin and 48-pin package reel specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 usb 2.0 hi-speed hub controller datasheet smsc usb251x 7 revision 1.1 (04-26-10) datasheet chapter 1 usb251x hub fami ly differences overview table 1.1 36-pin qfn (6x6x0.5 mm) rohs compliant part numbers table 1.2 48-pin qfn (7x7x0.5 mm) rohs compliant part numbers table 1.3 64-pin qfn (9x9x0.5 mm) rohs compliant part numbers note 1.1 *usb2512a/ai only uses a single transaction tr anslator, whereas all other parts use a multi transactions translator. part number down- stream ports true speed battery charging lower power consumption led port indicators clock (mhz) 0oc to 70oc 0oc to 85oc -40oc to 85oc usb2512 usb2512a* 2 24 3 usb2512i usb2512ai* 2 24 3 usb2512b 2 3 3 24 3 usb2512bi 2 3 3 24 3 usb2513 3 24 3 usb2513i 3 24 3 usb2513b 3 3 3 24 3 usb2513bi 3 3 3 24 3 usb2514 4 24 3 usb2514i 4 24 3 usb2514b 4 3 3 24 3 usb2514bi 4 3 3 24 3 part number down- stream ports true speed battery charging lower power consumption led port indicators clock (mhz) 0oc to 70oc 0oc to 85oc -40oc to 85oc usb2513 3 3 3 24/48 3 usb2513i 3 3 3 24/48 3 usb2514 4 3 3 24/48 3 usb2514i 4 3 3 24/48 3 3 part number down- stream ports true speed battery charging lower power consumption led port indicators clock (mhz) 0oc to 70oc 0oc to 85oc -40oc to 85oc usb2517 7 3 3 24 3 usb2517i 7 3 3 24 3 usb 2.0 high-speed 2-port hub controller datasheet revision 1.1 (04-26-10) 8 smsc usb251x datasheet chapter 2 general description the smsc usb251x hub family is a group of low-power, oem configurable, mtt (multi transaction translator) 1 hub controller ic?s with downstream ports for embedded usb solutions. the smsc usb251x hub family is fully compliant with the usb 2.0 specification. each of the smsc hub controllers can attach to an upstream port as a full-speed hub or as a full-/hi-speed hub. the smsc hub controllers support low-spe ed, full-speed, and hi-speed (if operating as a hi-speed hub) downstream devices on all of the enabled downstream ports. all required resistors on the usb ports are inte grated into the hub. this includes all series termination resistors on d+ and d? pins and al l required pull-down and pull-up resistors on d+ and d? pins. the over-current sense inputs for th e downstream facing ports have internal pull- up resistors. the usb251x hub family includes programmable features such as: multitrak tm technology which utilizes a dedicated tt per port to maintain consistent full- speed data throughput regardless of the number of active downstream connections. multitrak tm outperforms conventional usb 2.0 hubs with a si ngle tt in usb full-speed data transfers. portmap which provides flexible port mapping and disable sequences. the downstream ports of a usb251x hub can be reordered or disabled in any sequence to support multiple platform designs with minimum effort. for any port that is disabled, the usb251x hub controllers automatically reorder t he remaining ports to match the usb host controller?s port numbering scheme. portswap which adds per-port programmability to u sb differential-pair pin locations. portswap allows direct alignment of usb signals (d+/d-) to connectors to avoid uneven trace length or crossing of the usb differential signals on the pcb. phyboost which enables 4 programmable levels of usb signal drive strength in downstream port transceivers. phyboost attempts to restore usb signal integrity. oem selectable features a default configuration is available in each of the smsc usb251x hub controllers following a reset. this configuration may be sufficient fo r most applications. strapping option pins make it possible to modify a sub-set of the configuration options. the usb251x hub controllers may be configured by an external eeprom or a microcontroller. when using the microcontroller interface, the hub appears as an smbus slave device. if the hub is pin-strapped for external eeprom configurat ion but no external eepr om is present, then a value of ?0? will be written to all configuration dat a bit fields (the hub will attach to the host with all ?0? values). the usb251x hub family supports oem selectable features including: ? optional oem configuration via i 2 c eeprom or via the industry standard smbus interface from an external smbus host or microcontroller. ? supports compound devices on a port-by-port basis. ? selectable over-current sensing and port power control on an individual or ganged basis to match the oem?s choice of circuit board component selection. ? customizable vendor id, product id, and device id. ? configurable delay time for filteri ng the over-current sense inputs. ? configurable downstream port powe r-on time reported to the host. ? supports indication of the maximum current th at the hub consumes from the usb upstream port. ? supports indication of the maximum current required for the hub controller. 1.usb2512a/2ai only uses a single transaction translator. usb 2.0 hi-speed hub controller datasheet smsc usb251x 9 revision 1.1 (04-26-10) datasheet ? supports custom string descriptors (up to 31 characters): - product string - manufacturer string - serial number string ? when available, pin selectable options for default configuration may include: -downstream ports as non-removable ports -downstream ports as disabled ports -downstream port power control and over-curr ent detection on a ganged or individual basis -usb signal drive strength -usb differential pair pin location ? for more information, please contact your sales repr esentative to obtain a copy of the latest battery charging white paper. ? usb251xb/xbi products are fully footprint co mpatible with usb251x/xi/xa/xai products: -pin-compatible -direct drop-in replacement -use the same pcb components -usb-if compliance by similarity for ease of use and a complete cost reduction solution -pids, dids, and other register defaults may differ and can be configured to match the oem?s needs. please see table 8.2, "internal default, eeprom and smbus register memory map" for details. table 2.1 summary of compatibilities between usb251xb/xbi and usb251x/xi/xa/xai products part number drop-in replacement package usb2512 usb2512b 36qfn usb2512i usb2512bi usb2512a usb2512b usb2512ai usb2512bi usb2513 usb2513b usb2513i usb2513bi usb2514 usb2514b usb2514i usb2514bi usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 10 smsc usb251x datasheet chapter 3 acronyms i 2 c ? : inter-integrated circuit 1 ocs: over-current sense pcb: printed circuit board phy: physical layer pll: phase-locked loop qfn: quad flat no leads rohs: restriction of hazardous substances directive scl: serial clock sie: serial interface engine smbus: system management bus tt: transaction translator 1.i 2 c is a registered trademark of philips corporation. usb 2.0 hi-speed hub controller datasheet smsc usb251x 11 revision 1.1 (04-26-10) datasheet chapter 4 block diagram figure 4.1 usb251x hub family block diagram note 4.1 usb2512a/usb2512ai only supports a single transaction translator. note 4.2 the led port indicators only apply to usb2 513/13i/14/14i (48qfn only) and usb2517/17i. to upstream v bus 3.3 v upstream phy upstream usb data repeater controller serial interface engine serial interface to eeprom or smbus master scl sda port controller bus- power detect/ v bus pulse phy#1 usb data downstream oc sense switch/ led drivers usb data downstream port power 3.3 v pll 24 mhz crystal routing & port re-ordering logic regulator crfilt port power regulator phy#x port #x oc sense switch driver/ led drivers tt #x tt #1 ... port #1 oc sense switch driver/ led drivers oc sense switch/ led drivers ... the ?x? indicates the number of available downstream ports: 2, 3, 4, or 7. usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 12 smsc usb251x datasheet chapter 5 pin descriptions this chapter is organized by a set of pin configur ations (organized by package type) followed by a corresponding pin list organized alphabetically. a co mprehensive and detailed description list of each signal (named in the pin list) is organized by function in table 5.2, ?usb251x pin descriptions,? on page 22 . please refer to table 5.3, ?buffer type descriptions,? on page 27 for a list of buffer types. the ?n? symbol in the signal name indicates that th e active, or asserted, state occurs when the signal is at a low voltage level. when ?n? is not present af ter the signal name, the signal is asserted when it is at the high voltage level. the terms assertion and negation are used exclusively. this is done to avoid confusion when working with a mixture of ?activ e low? and ?active high? signals. the term assert, or assertion, indicates that a signal is active, in dependent of whether that le vel is represented by a high or low voltage. the term negate, or negat ion, indicates that a signal is inactive. 5.1 pin configurations and list s (organized by package type) figure 5.1 2-port 36-pin qfn note: *battery charging enable (bc_en) is only available in the usb251xb/bi. ground pad (must be connected to vss) smsc usb2512/12a/12b usb2512i/12ai/12bi (top view qfn-36) 26 vdd33 25 reset_n 24 hs_ind / cfg_sel[1] 23 scl / smbclk / cfg_sel[0] 22 sda / smbdata / non_rem[1] 21 nc 20 nc 19 vbus_det 27 nc 18 nc 17 ocs_n[2] 16 prtpwr[2] / bc_en[2]* 15 ocs_n[1] 14 vdd33 13 crfilt 12 prtpwr[1] / bc_en[1]* 11 test 10 vdd33 susp_ind / local_pwr / non_rem[0] 28 vdd33 29 usbdp_up 31 xtalout 32 xtalin / clkin 33 rbias 36 vdd33 35 pllfilt 34 usbdm_up 30 vdd33 1 usbdm_dn[1] 2 usbdp_dn[1] 3 usbdm_dn[2] 4 usbdp_dn[2] 5 nc 6 nc 7 nc 8 nc 9 indicates pins on the bottom of the device. usb 2.0 hi-speed hub controller datasheet smsc usb251x 13 revision 1.1 (04-26-10) datasheet figure 5.2 3-port 36-pin qfn note: *battery charging enable (bc_en) is only available in the usb251xb/bi. ground pad (must be connected to vss) smsc usb2513/13i usb2513b/13bi (top view qfn-36) 26 vdd33 25 reset_n 24 hs_ind / cfg_sel[1] 23 scl / smbclk / cfg_sel[0] 22 sda / smbdata / non_rem[1] 21 nc 20 nc 19 vbus_det 27 ocs_n[3] 18 prtpwr[3] / bc_en[3]* 17 ocs_n[2] 16 prtpwr[2] / bc_en[2]* 15 ocs_n[1] 14 vdd33 13 crfilt 12 prtpwr[1] / bc_en[1]* 11 test 10 vdd33 susp_ind / local_pwr / non_rem[0] 28 vdd33 29 usbdp_up 31 xtalout 32 xtalin / clkin 33 rbias 36 vdd33 35 pllfilt 34 usbdm_up 30 vdd33 1 usbdm_dn[1] / prt_dis_m[1] 2 usbdp_dn[1] / prt_dis_p[1] 3 usbdm_dn[2] / prt_dis_m[2] 4 usbdp_dn[2] / prt_dis_p[2] 5 usbdm_dn[3] / prt_dis_m[3] 6 usbdp_dn[3] / prt_dis_p[3] 7 nc 8 nc 9 indicates pins on the bottom of the device. usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 14 smsc usb251x datasheet figure 5.3 4-port 36-pin qfn note: *battery charging enable (bc_en) is only available in the usb251xb/bi. ground pad (must be connected to vss) smsc usb2514/14i usb2514b/14bi (top view qfn-36) indicates pins on the bottom of the device. 26 vdd33 25 reset_n 24 hs_ind / cfg_sel[1] 23 scl / smbclk / cfg_sel[0] 22 sda / smbdata / non_rem[1] 21 ocs_n[4] 20 prtpwr[4] / bc_en[4]* 19 vbus_det 27 ocs_n[3] 18 prtpwr[3] / bc_en[3]* 17 ocs_n[2] 16 prtpwr[2] / bc_en[2]* 15 ocs_n[1] 14 vdd33 13 crfilt 12 prtpwr[1] / bc_en[1]* 11 test 10 vdd33 susp_ind / local_pwr / non_rem[0] 28 vdd33 29 usbdp_up 31 xtalout 32 xtalin / clkin 33 rbias 36 vdd33 35 pllfilt 34 usbdm_up 30 vdd33 1 usbdm_dn[1] / prt_dis_m[1] 2 usbdp_dn[1] / prt_dis_p[1] 3 usbdm_dn[2] / prt_dis_m[2] 4 usbdp_dn[2] / prt_dis_p[2] 5 usbdm_dn[3] / prt_dis_m[3] 6 usbdp_dn[3] / prt_dis_p[3] 7 usbdm_dn[4] / prt_dis_m[4] 8 usbdp_dn[4] / prt_dis_p[4] 9 usb 2.0 hi-speed hub controller datasheet smsc usb251x 15 revision 1.1 (04-26-10) datasheet figure 5.4 3-port 48-pin qfn ground pad (must be connected to vss) smsc usb2513 / usb2513i (top view qfn-48) prtpwr_pol 38 susp_ind / local_pwr / non_rem[0] 39 led_a_n[1] / prtswp[1] 37 sel48 40 vdd33 41 usbdp_up 43 xtalout 44 xtalin / clkin 45 rbias 48 vdd33 47 pllfilt 46 usbdm_up 42 vdd33 1 usbdm_dn[1] / prt_dis_m[1] 2 usbdp_dn[1] / prt_dis_p[1] 3 usbdm_dn[2] / prt_dis_m[2] 4 usbdp_dn[2] / prt_dis_p[2] 5 usbdm_dn[3] / prt_dis_m[3] 6 usbdp_dn[3] / prt_dis_p[3] 7 nc 8 nc 9 nc 10 nc 11 vdd33 12 21 prtpwr[3] 20 ocs_n[2] 19 prtpwr[2] 18 vdd33 17 prtpwr[1] 16 crfilt 15 ocs_n[1] 14 test 13 nc 23 led_a_n[3] / prtswp[3] 22 led_b_n[3] / gang_en 24 led_b_n[2] / boost[1] 35 led_b_n[1] / boost[0] 34 vbus_det 33 reset_n 32 hs_ind / cfg_sel[1] 31 scl / smbclk / cfg_sel[0] 30 vdd33 29 sda / smbdata / non_rem[1] 28 nc 36 cfg_sel[2] 27 nc 26 ocs_n[3] 25 led_a_n[2] / prtswp[2] indicates pins on the bottom of the device. usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 16 smsc usb251x datasheet figure 5.5 4-port 48-pin qfn ground pad (must be connected to vss) smsc usb2514 / usb2514i (top view qfn-48) prtpwr_pol 38 susp_ind / local_pwr / non_rem[0] 39 led_a_n[1] / prtswp[1] 37 sel48 40 vdd33 41 usbdp_up 43 xtalout 44 xtalin / clkin 45 rbias 48 vdd33 47 pllfilt 46 usbdm_up 42 vdd33 1 usbdm_dn[1] / prt_dis_m[1] 2 usbdp_dn[1] / prt_dis_p[1] 3 usbdm_dn[2] / prt_dis_m[2] 4 usbdp_dn[2] / prt_dis_p[2] 5 usbdm_dn[3] / prt_dis_m[3] 6 usbdp_dn[3] / prt_dis_p[3] 7 usbdm_dn[4] / prt_dis_m[4] 8 usbdp_dn[4] / prt_dis_p[4] 9 led_b_n[4] 10 nc 11 vdd33 12 21 prtpwr[3] 20 ocs_n[2] 19 prtpwr[2] 18 vdd33 17 prtpwr[1] 16 crfilt 15 ocs_n[1] 14 test 13 led_a_n[4] / prtswp[4] 23 led_a_n[3] / prtswp[3] 22 led_b_n[3] / gang_en 24 led_b_n[2] / boost[1] 35 led_b_n[1] / boost[0] 34 vbus_det 33 reset_n 32 hs_ind / cfg_sel[1] 31 scl / smbclk / cfg_sel[0] 30 vdd33 29 sda / smbdata / non_rem[1] 28 ocs_n[4] 36 cfg_sel[2] 27 prtpwr[4] 26 ocs_n[3] 25 led_a_n[2] / prtswp[2] indicates pins on the bottom of the device. usb 2.0 hi-speed hub controller datasheet smsc usb251x 17 revision 1.1 (04-26-10) datasheet figure 5.6 7-port 64-pin qfn ground pad (must be connected to vss) smsc usb2517/17i (top view qfn-64) usbdp_dn[6] / prt_dis_p[6] 54 usbdm_dn[7] / prt_dis_m[7] 55 usbdm_dn[6] / prt_dis_m[6] 53 usbdp_dn[7] / prt_dis_p[7] 56 vdd33 57 usbdp_up 59 xtalout 60 xtalin / clkin 61 rbias 64 vdd33 63 pllfilt 62 usbdm_up 58 vdd33 1 usbdm_dn[1] / prt_dis_m[1] 2 usbdp_dn[1] / prt_dis_p[1] 3 usbdm_dn[2] / prt_dis_m[2] 4 usbdp_dn[2] / prt_dis_p[2] 5 usbdm_dn[3] / prt_dis_m[3] 6 usbdp_dn[3] / prt_dis_p[3] 7 usbdm_dn[4] / prt_dis_m[4] 8 usbdp_dn[4] / prt_dis_p[4] 9 usbdp_dn[5] / prt_dis_p[5] 10 usbdm_dn[5] / prt_dis_m[5] 11 vdd33 12 27 ocs_n[2] 26 prtpwr[2] 25 crfilt 24 vdd33 23 ocs_n[4] 22 prtpwr[3] 21 ocs_n[3] 20 prtpwr[4] 19 test 29 prtpwr[1] 28 ocs_n[1] 30 prtpwr[5] 45 vdd33 44 susp_ind / local_pwr / non_rem[0] 43 vbus_det 42 hs_ind / cfg_sel[1] 41 scl / smbclk / cfg_sel[0] 40 sda / smbdata / non_rem[1] 39 prtpwr[6] 38 ocs_n[6] 46 reset_n 37 ocs_n[7] 36 prtpwr[7] 35 ocs_n[5] led_b_n[1] / boost[0] 50 led_a_n[1] / prtswp[1] 51 led_a_n[2] / prtswp[2] 49 vdd33 52 47 led_b_n[2] / boost[1] led_a_n[3] / prtswp[3] 48 33 led_b_n[3] / gang_en led_a_n[4] / prtswp[4] 34 18 led_b_n[5] 17 led_a_n[6] / prtswp[6] 32 led_b_n[4] 31 led_a_n[5] / prtswp[5] cfg_sel[2] 13 led_b_n[6] 14 led_a_n[7] / prtswp[7] 15 led_b_n[7] 16 indicates pins on the bottom of the device. usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 18 smsc usb251x datasheet table 5.1 pin list in alphabetical order symbol name pin numbers 36 qfn 48qfn 64 qfn usb2512 usb2512i usb2512a usb2512ai usb2512b usb2512bi usb2513 usb2513i usb2513b usb2513bi usb2514 usb2514i usb2514b usb2514bi usb2513 usb22513i usb2514 usb22514i usb2517 usb2517i bc_en[1] battery charging strap option -12-12-12 - bc_en[2] - 16 - 16 - 16 - bc_en[3] - 18 - 18 - bc_en[4] - 20 - boost[0] phy boost strapping option -3650 boost[1] - 24 48 cfg_sel[0] configuration programming selection 24 31 41 cfg_sel[1] 25 32 42 cfg_sel[2] - 33 13 clkin external clock input 33 45 61 crfilt core regulator filter capacitor 14 17 25 gang_en ganged port power strap option -2234 ground pad exposed pad tied to ground (vss) epad hs_ind hi-speed upstream port indicator 25 32 42 led_a_n[1] port led indicator -3751 led_a_n[2] - 25 49 led_a_n[3] - 23 47 led_a_n[4] - 13 33 led_a_n[5] - 31 led_a_n[6] - 17 led_a_n[7] - 15 led_b_n[1] enhanced indicator port led -3650 led_b_n[2] - 24 48 led_b_n[3] - 22 34 led_b_n[4] - 12 32 led_b_n[5] - 18 led_b_n[6] - 16 led_b_n[7] - 14 local_pwr local power detection 28 39 45 usb 2.0 hi-speed hub controller datasheet smsc usb251x 19 revision 1.1 (04-26-10) datasheet nc no connect 6 - 8 11 - nc 7 - 9 - nc 18 - 11 - nc 19 - 12 - nc 8 - 13 - nc 9 - 27 - nc 20 - 28 - nc 21 - non_rem[0] non- removable port strap option 28 39 45 non_rem[1] 22 29 40 ocs_n[1] over-current sense 13 16 28 ocs_n[2] 17 20 27 ocs_n[3] - 19 26 22 ocs_n[4] - 21 - 28 21 ocs_n[5] - 35 ocs_n[6] - 38 ocs_n[7] - 37 pllfilt pll regulator filter capacitor 34 46 62 prt_dis_m[1] downstream port disable strap option -1 prt_dis_m[2] - 3 prt_dis_m[3] - 6 prt_dis_m[4] - 8 - 8 prt_dis_m[5] - 11 prt_dis_m[6] - 53 prt_dis_m[7] - 55 prt_dis_p[1] port disable - 2 prt_dis_p[2] - 4 prt_dis_p[3] - 7 prt_dis_p[4] - 9 - 9 prt_dis_p[5] - 12 prt_dis_p[6] - 54 prt_dis_p[7] - 56 table 5.1 pin list in alphabetical order (continued) symbol name pin numbers 36 qfn 48qfn 64 qfn usb2512 usb2512i usb2512a usb2512ai usb2512b usb2512bi usb2513 usb2513i usb2513b usb2513bi usb2514 usb2514i usb2514b usb2514bi usb2513 usb22513i usb2514 usb22514i usb2517 usb2517i usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 20 smsc usb251x datasheet prtpwr[1] usb port power enable 12 15 29 prtpwr[2] 16 19 26 prtpwr[3] - 18 21 23 prtpwr[4] - 20 - 27 20 prtpwr[5] - 30 prtpwr[6] - 39 prtpwr[7] - 36 prtpwr_pol port power polarity strapping -38- prtswp[1] port swap strapping option -3751 prtswp[2] - 25 49 prtswp[3] - 23 47 prtswp[4] - 13 33 prtswp[5] - 31 prtswp[6] - 17 prtswp[7] - 15 rbias usb transceiver bias 35 47 63 reset_n reset input 26 34 43 scl serial clock 24 31 41 sda serial data signal 22 29 40 sel48 select 48 mhz clock input -40- smbclk system management bus clock 24 31 41 smbdata server message block data signal 22 29 40 susp_ind active/suspend status indicator 28 39 45 test test pin 11 14 19 usbdm_up usb bus data 30 42 58 usbdp_up 31 43 59 table 5.1 pin list in alphabetical order (continued) symbol name pin numbers 36 qfn 48qfn 64 qfn usb2512 usb2512i usb2512a usb2512ai usb2512b usb2512bi usb2513 usb2513i usb2513b usb2513bi usb2514 usb2514i usb2514b usb2514bi usb2513 usb22513i usb2514 usb22514i usb2517 usb2517i usb 2.0 hi-speed hub controller datasheet smsc usb251x 21 revision 1.1 (04-26-10) datasheet usbdm_dn[1] hi-speed usb data 1 usbdm_dn[2] 3 usbdm_dn[3] - 6 usbdm_dn[4] - 8 - 8 usbdm_dn[5] - 11 usbdm_dn[6] - 53 usbdm_dn[7] - 55 usbdp_dn[1] 2 usbdp_dn[2] 4 usbdp_dn[3] - 7 usbdp_dn[4] - 9 - 9 usbdp_dn[5] - 12 usbdp_dn[6] - 54 usbdp_dn[7] - 56 vbus_det upstream vbus power detection 27 35 44 vdd33 3.3 v power 5 vdd33 10 vdd33 15 18 24 vdd33 23 30 46 vdd33 29 41 52 vdd33 36 48 57 vdd33 - 64 xtalin crystal input 33 45 61 xtalout crystal output 32 44 60 table 5.1 pin list in alphabetical order (continued) symbol name pin numbers 36 qfn 48qfn 64 qfn usb2512 usb2512i usb2512a usb2512ai usb2512b usb2512bi usb2513 usb2513i usb2513b usb2513bi usb2514 usb2514i usb2514b usb2514bi usb2513 usb22513i usb2514 usb22514i usb2517 usb2517i usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 22 smsc usb251x datasheet 5.2 usb251x pin descriptio ns (grouped by function) table 5.2 usb251x pin descriptions symbol buffer type description upstream usb 2.0 interfaces usbdm_up usbdp_up io-u usb data these pins connect to the upstream usb bus data signals (host, port, or upstream hub). vbus_det i/o12 detect upstream vbus power detects the state of upstream vbus power. the smsc hub monitors vbus_det to determine when to assert the internal d+ pull-up resistor which signals a connect event. when designing a detachable hub, this pin should be connected to vbus on the upstream port via a 2 to 1 voltage divider. for self-powered applications with a perma nently attached host, this pin must be connected to 3.3 v (typically vdd33). downstream usb 2.0 interfaces usbdp_dn[x:1]/ prt_dis_p[x:1] io-u hi-speed usb data these pins connect to the downstream usb peripheral devices attached to the hub?s port. to disable, pull up with a 10 k resistor to 3.3 v. usbdm_dn[x:1]/ prt_dis_m[x:1] downstream port disable strap option if this strap is enabled by pa ckage and configuration settings (see table 8.1, "hub configuration options" ), then this pin will be sampled at reset_n negation to determine if the port is disabled. to disable a port, pull up both prt_ dis_m[x:1] and prt_dis_p[x:1] pins corresponding to the port numbers. prtpwr[x:1] / bc_en[x] o12 usb power enable enables power to usb peripheral devices downstream. when prtpwr_pol pin is unavailable, the hub supports active high power controllers only. when prtpwr_pol pin is available, t he active signal level of the prtpwr pins is determined by the power pol arity strapping function of the prtpwr_pol pin. ipd battery charging strap option *this feature is only available on usb251xb/bi. if this strap is enabled by pack age and configuration settings, (see table 8.1, "hub configuration options" ), this pin will be sampled at reset_n negation to determine if ports [x:1] support the ba ttery charging protoc ol (and thus the supporting external port power controller s) that would enable a device to draw the currents per the usb batt ery charging specification. bc_en[x] = 1: battery charging f eature is supported for port x bc_en[x] = 0: battery chargi ng feature is no t supported for port x usb 2.0 hi-speed hub controller datasheet smsc usb251x 23 revision 1.1 (04-26-10) datasheet downstream usb 2.0 in terfaces (continued) led_a_n[x:1] / prtswp[x:1] i/o12 port led indicators this pin will be active low when led support is enabled via eeprom or smbus. port swap strapping option if this strap is enabled by pa ckage and configuration settings (see table 8.1, "hub configuration options" ), this pin will be sampled at reset_n negation to determine the electrical connection polarity of the downstream usb port pins (usb_dp and usb_dm). also, the active state of the led will be determined as follows: ?0? = port polarity is normal, led is active high. ?1? = port polarity (usb_dp and usb_dm) is swapped, led is active low. led_b_n[7:4] i/o12 enhanced indicator port led for ports 4-7 enhanced indicator led for ports 4-7. this pin will be active low when led support is enabled via eeprom or smbus. led_b_n[3] / gang_en i/o12 enhanced indicator port led for port 3 this pin will be active low when led support is enabled via eeprom or smbus. ganged power and over-current strap option this signal selects between ganged or individual port power and over-current sensing. if this strap is enabled by package and configuration settings (see table 8.1, "hub configuration options" ), this pin will be sampled at reset_n negation to determine the mode as follows: ?0? = individual sensing and switchi ng, led_b_n[3] is active high. ?1? = ganged sensing and switching, led_b_n[3] is active low. table 5.2 usb251x pin descriptions (continued) symbol buffer type description usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 24 smsc usb251x datasheet downstream usb 2.0 in terfaces (continued) led_b_n[2:1] / boost[1:0] i/o12 enhanced indicator port led for ports 1 and 2 enhanced indicator led for ports 1 and 2. this pin will be active low when led support is enabled via eeprom or smbus. if this strap option is enabled by pa ckage and configuration settings (see table 8.1, "hub configuration options" ), this pin will be sampled at reset_n negation to determine if all phy ports (upstream and downstream) operate at a normal or boosted electrical level. also, the active state of the leds will be determined as follows: see section 8.2.1.27, "register f6h: boost_up," on page 45 and section 8.2.1.29, "register f8h: boost_4:0," on page 46 for more information. boost[1:0] = boost_iout[1:0] boost[1:0] = ?00?, led_b_n[2] is active high, led_b_n[1] is active high. boost[1:0] = ?01?, led_b_n[2] is active high, led_b_n[1] is active low. boost[1:0] = ?10?, led_b_n[2] is active low, led_b_n[1] is active high. boost[1:0] = ?11?, led_b_n[2] is active low, led_b_n[1] is active low. prtpwr_pol ipu port power polarity strapping port power polarity strapping determination for th e active signal polarity of the [x:1]prtpwr pins. while reset_n is asserted , the logic state of this pin will (thr ough the use of internal combinatorial logic) determine the active state of the prtpwr pins in order to ensure that downst ream port power is not inadvertently enabled to inactive ports during a hardware reset. when reset_n is negated, the logic value will be latched internally, and will retain the active signal polarity for the prtpwr[x:1] pins. ?1? = prtpwr[x:1]_p/n pins have an active ?high? polarity ?0? = prtpwr[x:1]_p/n pins have an active ?low? polarity warning: active low port power controllers may glitch the downstream port power when the system power is first applied. care should be taken when designing with active low components. when prtpwr_pol is not an available pin on the package, the hub will only support active high power controllers. ocs_n[x:1] ipu over-current sense input from external current monitor indicating an over-current condition. rbias i-r usb transceiver bias a 12.0 k (+/- 1%) resistor is attached from ground to this pin to set the transceiver?s inter nal bias settings. table 5.2 usb251x pin descriptions (continued) symbol buffer type description usb 2.0 hi-speed hub controller datasheet smsc usb251x 25 revision 1.1 (04-26-10) datasheet serial port interfaces sda / smbdata / non_rem[1] i/osd12 serial data signal (sda) server message block data signal (smbdata) non-removable port strap option if this strap is enabled by package and configuration settings (see ta b l e 8 . 1 ), this pin will be sampled (in conjunction with local_pwr / susp_ind / non_rem[0]) at reset_n negation to determine if ports [7:1] contain permanently attached (non-removable) devices: non_rem[1:0] = ?00?, all ports are removable. non_rem[1:0] = ?01?, port 1 is non-removable. non_rem[1:0] = ?10?, ports 1 & 2 are non-removable. non_rem[1:0] = ?11?, when availabl e, ports 1 2 & 3 are non-removable. reset_n is reset input the system can reset the chip by drivi ng this input low. the minimum active low pulse is 1 s. scl / smbclk / cfg_sel[0] i/osd12 serial clock (scl) system management bus clock (smbclk) configuration select: the logic state of this multifunction pin is internally latched on the rising edge of reset_n (reset_n negation), and will determine the hub configuration method as described in table 8.1, "hub configuration options" . hs_ind / cfg_sel[1] i/o12 hi-speed upstream port indicator hs_ind: hi-speed indicator for up stream port connection speed. the active state of the led will be determined as follows: cfg_sel[1] = ?0?, hs_ind is active high, cfg_sel[1] = ?1?, hs_ind is active low, ?asserted? = the hub is connected at hs ?negated? = the hub is connected at fs configuration programming select cfg_sel[1]: the logic state of this pin is internally latched on the rising edge of reset_n (reset_n negation), and will determine the hub configuration method as described in table 8.1, "hub configuration options" . cfg_sel[2] i configuration programming select the logic state of this pin is interna lly latched on the rising edge of reset_n (reset_n negation), and will determine the hub configuration method as described in table 8.1, "hub configuration options" . when the cfg_sel[2] pin is unavailable, then the logic is internally tied to ?0?. table 5.2 usb251x pin descriptions (continued) symbol buffer type description usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 26 smsc usb251x datasheet misc xtalin iclkx crystal input 24 mhz crystal this pin connects to either one terminal of the crystal or to an external 24 mhz clock when a crystal is not used. clkin external clock input this pin connects to either one terminal of the crystal or to an external 24 mhz clock when a crystal is not used. xtalout oclkx crystal output 24 mhz crystal this is the other terminal of the crystal, or a no connect pin, when an external clock source is used to drive xtalin/clkin. susp_ind / local_pwr / non_rem[0] i/o active/suspend status led suspend indicator: indicates usb state of the hub. ?negated? = unconfigured, or configured and in usb suspend ?asserted? = the hub is conf igured, and is active (i.e., not in suspend) local power: detects availabilit y of local self-power source. low = self/local power source is not available (i.e., the hub gets all power from upstream usb vbus). high = self/local power source is available. non_rem[0] strap option: if this strap is enabled by pa ckage and configuration settings (see table 8.1, "hub configuration options" ), this pin will be sampled (in conjunction with non_rem[1]) at reset_n negation to determine if ports [x:1] contain permanently attached (non-removable) de vices. also, the active state of the led will be determined as follows: non_rem[1:0] = ?00?, all ports are removable, and the led is active high non_rem[1:0] = ?01?, port 1 is non-re movable, and the led is active low non_rem[1:0] = ?10?, ports 1 & 2 are n on-removable, and the led is active high non_rem[1:0] = ?11?, when available, ports 1, 2 & 3 are non-removable, and the led is active low test ipd test pin user must treat as a no connect pin or connect to ground. no trace or signal should be routed or attached to this pin. table 5.2 usb251x pin descriptions (continued) symbol buffer type description usb 2.0 hi-speed hub controller datasheet smsc usb251x 27 revision 1.1 (04-26-10) datasheet 5.3 buffer type descriptions sel48 i 48 mhz clock input selection 48 mhz external input clock select. when the hub is clocked from an external clock source, this pin selects either 24 mhz or 48 mhz mode. ?0? = 24 mhz ?1? = 48 mhz power, ground, and no connects crfilt vdd core regulator filter capacitor this pin must have a 1.0 f (or greater) 20% (esr <0.1 ) capacitor to vss. vdd33 3.3 v power pllfilt pll regulator filter capacitor this pin must have a 1.0 f (or greater) 20% (esr <0.1 ) capacitor to vss. vss ground pad / epad the package slug is the only vss for th e device and must be tied to ground with multiple vias. nc no connect no signal or trace should be ro uted or attached to these pins. table 5.3 buffer type descriptions buffer description i input. i/o input/output. ipd input with internal weak pull-down resistor. ipu input with internal weak pull-up resistor. is input with schmitt trigger. o12 output 12 ma. table 5.2 usb251x pin descriptions (continued) symbol buffer type description usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 28 smsc usb251x datasheet i/o12 input/output buffer with 12 ma sink and 12 ma source. i/osd12 open drain with schmitt trigger and 12 ma sink. meets the i 2 c-bus specification, version 2.1, requirements. iclkx xtal clock input. oclkx xtal clock output. i-r rbias. i/o-u analog input/output def ined in usb specification. table 5.3 buffer type descriptions (continued) buffer description usb 2.0 hi-speed hub controller datasheet smsc usb251x 29 revision 1.1 (04-26-10) datasheet chapter 6 led usage description 6.1 led functionality usb2513 and usb2514 (48-pin qfn only) and u sb2517/17i smsc hubs support two different (mutually exclusive) led modes. the ?x? represent s the number of downstream ports. the usb mode provides up to 14 led?s that conform to the usb 2.0 specification functional requirements for green and amber led?s. the led mode ?speed indicato r? provides the downs tream device connection speed. 6.1.1 usb mode 14-wire the led_a_n[x:1] pins are used to provide green led support as defined in the usb 2.0 specification. the led_b_n[x:1] pins are used to provide amber led support as defined in the usb 2.0 specification. the usb specific ation defines the led?s as port st atus indicators for the downstream ports. please note that no indication of port speed is possible in this mode. the pins are utilized as follows: led_a_n[x:1] = port [x:1] green led led_b_n[x:1] = port [x:1] amber led 6.1.2 led mode speed indication the led_a[x:1]_n pins are used to provide connection status as well as port speed by using dual color led's. this scheme requires that the led's be in the same package, and that a third color is produced so that the user perceives bot h led's as being driven "simultaneously". the led_a[x:1] pins used in this mode are connect ed to x number of dual color led?s (each led pair in a single package). these pins indicate the usb speed of each attached downstream device. each dual color led provides two separate co lors (commonly green and red). if each of these separate colors are pulsed on and off at a rapid rate, a user will see a third color (in this example, orange). using this method, 4 different "color" states are possible (green, red, orange, and off). figure 6.1 dual color led implementation example hub led pin d1a (green led) d1b (red led) 3.3 v general purpose diode current limiting resistor connection to other dual color diodes usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 30 smsc usb251x datasheet figure 6.1 shows a simple example of how this led circuit will be implemented. the circuit should be replicated for each of the x led pins on the smsc hub. in this circuit, when the led pin is driven to a logic low state, the green led will light up. wh en the led pin is driven to a logic high state the red led will light up. when a 1 khz square wave is driven out on the led pin, the green and red led's will both alternately light up giving the effect of the color oran ge. when nothing is driven out on the led pin (i.e. the pin floats to a "tri-state" co ndition), neither the green nor red led will light up, this is the "off" state. the assignment is as follows: led_a_n[x:1] = led d[x:1] (downstream port [x:1]) the usage is as follows: led_a_n[x] driven to logic low = ls device attached (green led) led_a_n[x] driven to logic high = fs device attached (red led) led_a_n[x] pulsed @ 1 khz = hs device attach ed (orange color by pulsing red & green). led_a_n[x] is tri-state= no devices are attached, or the hub is in suspend, led's are off. usb 2.0 hi-speed hub controller datasheet smsc usb251x 31 revision 1.1 (04-26-10) datasheet chapter 7 battery charging support 7.1 general description the battery charging feature is only available in usb251xb (which represents usb2512b/3b/4b and usb2512bi/3bi/4bi hub family pr oducts). any one or combination of downstream ports on the usb251xb hub can be configured to support battery charging. the smsc hub provides support fo r battery charging devices on a per port basis in compliance with the usb battery charging specification, version 1.1. the hub can be configured to individually enable each downstream port for battery charging support either via pin strappi ng as illustrated in figure 7.1 or by setting the corresp onding configuration bits via eeprom or smbus. figure 7.1 battery charging via external power supply 7.2 usb battery charging a downstream port enabled for battery charging tu rns on port power as soon as the configuration process has completed. the hub does not need to be enumerated nor does vbus_det need to be asserted for the port power to be enabled. these conditions allow battery charging in s3, s4 and s5 system power states as well as in the fully operational state. the usb battery charging specification does not interfere with standard usb operation, whic h allows a device to perform battery charging at any time. a port that supports battery charging must be able to support 1.5 amps of current on vbus. standard usb port power controllers typically only allow for 0. 8 amps of current before detecting an over-current condition. therefore, the 5 volt power supply, port pow er controller or over-current protection devices must be chosen to handle the larger current demand compared to standard usb hub designs. 7.2.1 special behavi or of prtpwr pins the smsc hub enables vbus by asserting the por t power (prtpwr) pin as soon as the hardware configuration process has complete d. if the port detects an over-current condition, prtpwr will be turned off to protect the circuitry from overloading. if an over-current condition is detected when the hub is not enumerated, prtpwr can only be turned on from the host or if reset_n is toggled. these usb251xb/xbi vbus prtpwr[x] in en flag ocs_n[x] r strap 3.3 v 5 v note: r strap enables battery charging. usb port power controller usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 32 smsc usb251x datasheet behaviors provide battery charging even when the hub is not enumerat ed and protect the hub from sustained short circuit conditions. if the short circ uit condition persists when the hub is plugged into a host system the user is notified that a port has an over-current co ndition. otherwise the prtpwr is turned on by the host system and the port operates normally. 7.3 battery charging configuration configuration of ports to support battery chargi ng is done through a strap option on the corresponding ports prtpwr[x] / bc_en[x] pin. see chapter 5, pin descriptions , or through eeprom or smbus configuration load. 7.3.1 battery charging enab led via eeprom or smbus register memory map location 0xd0 is allocated fo r battery charging support. the "battery charging" register at location 0xd0 starting from bit 1 e nables battery charging for each downstream port when asserted. bit 1 represents port 1 and so on. each port with battery charging enabled asserts the corresponding prtpwr[x:0] pin. usb 2.0 hi-speed hub controller datasheet smsc usb251x 33 revision 1.1 (04-26-10) datasheet chapter 8 configuration options 8.1 hub smsc?s usb 2.0 hub is fully specif ication compliant to the universal serial bus specification, version 2.0, april 27, 2000 (12/7/2000 and 5/28/2002 errata). please referenc e chapter 10 (hub specification) for general details regarding hub operation and functionality. the hub provides 1 transaction translator (tt) t hat is shared by both down stream ports (defined as single-tt configuration), the tt contains 4 non-periodic buffers. 8.1.1 hub configuration options the smsc hub supports a large nu mber of features (some are mu tually exclusive), and must be configured in order to correctly function when attached to a usb host controller. there are three principal ways to configure the hub: smbus, eeprom, or by internal default settings (with or without configuration option over-rides). in all cases, the configuratio n method will be determined by the cfg_sel[2], cfg_sel[1] and cfg_sel [0] pins immediately after reset_n negation. please refer to table 8.1, "hub configuration options" for more information. 8.1.2 smbus or eeprom interface table 8.1 hub configuration options cfg_sel[2] cfg_sel[1] c fg_sel[0] description 0 0 0 internal default configuration without any over-rides ? strap options enabled ? self-powered operation enabled ? led mode = speed (when available on package) ? individual power switching ? individual over-current sensing 0 0 1 configured as an smbus slave for external download of user-defined descriptors ? strap options disabled ? all settings are controlled by registers as set by the user 0 1 0 internal default configuration ? strap options enabled ? bus-powered operation ? led mode = usb (when available on package) ? individual power switching ? individual over-current sensing 01 12-wire i 2 c eeproms are supported ? strap options disabled ? all settings are controlled by registers as set by the user usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 34 smsc usb251x datasheet note: when the cfg_sel[2] pin is unavailable, then the logic is internally tied to ?0?. 8.1.2.1 power switching polarity when the prtpwr_pol pin is unavailable (3 and 4 port, 48-pin packages only), the hub only supports ?active high? port power controllers. 8.1.3 vbus detect according to section 7.2.1 of th e usb 2.0 specification, a downstream port can never provide power to its d+ or d- pull-up resistors unless the upstream port?s vbus is in the asserted (powered) state. the vbus_det pin on the hub monitors the state of the upstream vbus signal and will not pull-up the d+ resistor if vbus is not acti ve. if vbus goes from an active to an inactive state (not powered), the hub will remove power from the d+ pull-up resistor within 10 seconds. 8.2 eeprom interface the smsc hub can be configured via a 2-wire (i 2 c) eeprom (256x8). (please see table 8.1, "hub configuration options" for specific details on how to enable configuration via an i 2 c eeprom). the internal state-mach ine will (when conf igured for eeprom support) read the external eeprom for configuration data. the hub will then ?attach? to the upstream usb host. note: the hub does not have the capacity to write, or ?program,? an external eeprom. the hub only has the capability to read external eeprom s. the external eeprom will be read (even if it is blank or non-populated), and the hub will be ?configured? wit h the values that are read. 1 0 0 internal default configurat ion with the following over-rides ? dynamic power-switching enabled ? strap options disabled ? led mode = speed (when available on package) ? individual power switching ? individual over-current sensing 1 0 1 internal default configurat ion with the following over-rides ? dynamic power-switching enabled ? strap options disabled ? led mode = usb (when available on package) ? individual power switching ? individual over-current sensing 1 1 0 internal default configurat ion with the following over-rides ? strap options disabled ? led mode = speed (when available on package) ? individual power switching ? individual over-current sensing 1 1 1 internal default configurat ion with the following over-rides ? strap options disabled ? led mode = usb (when available on package) ? ganged port power switching ? ganged over-current sensing table 8.1 hub configuration options (continued) cfg_sel[2] cfg_sel[1] c fg_sel[0] description usb 2.0 hi-speed hub controller datasheet smsc usb251x 35 revision 1.1 (04-26-10) datasheet please see the internal register set (common to eeprom and smbus) for a list of the available data fields. please visit www.smsc.com/ ftpdocs/usb.html to locate the configuration ut ility for the hub eeprom data. select th e ?e2prommap.msi? link to download the tool. each register has r/w capability. smbus and eepr om reset values are 0x00. reserved registers should be written to ?0? unless ot herwise specified. contents read sh ould be ignored (such as the case of ?r? in the table below). 8.2.1 internal register set (common to eeprom and smbus) table 8.2 internal default, eeprom and smbus regist er memory map address register name default rom valu es (hexidecimal) usb2512/12i usb2512a/12ai usb2513/13i usb2514/14i usb2512b/12bi usb2513b/13bi usb2514b/14bi usb2517/17i 00h vendor id lsb 24 01h vendor id msb 04 02h product id lsb 12 13 14 12 13 14 17 03h product id msb 25 04h device id lsb 00 a0 00 a0 00 05h device id msb 00 0a 00 0b 00 06h configuration data byte 1 8b 9b 07h configuration data byte 2 20 08h configuration data byte 3 02 09h non-removable devices 00 0ah port disable (self) 08 00 0bh port disable (bus) 08 00 0ch max power (self) 01 0dh max power (bus) 32 0eh hub controller max current (self) 01 0fh hub controller max current (bus) 32 10h power-on time 32 11h language id high 00 12h language id low r 00 13h manufacturer string length r 00 14h product string length r 00 15h serial string length r 00 16h-53h manufacturer string r 00 usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 36 smsc usb251x datasheet 8.2.1.1 register 00h: vendor id (lsb) 8.2.1.2 register 01h: vendor id (msb) 54h-91h product string r 00 92h-cfh serial string r 00 d0h battery charging enable r 00 e0h reserved 00 r f5h reserved 00 r 00 f6h boost_up 00 f7h boost_7:5 00 r 00 f8h boost_x:0 00 f9h reserved 00 fah port swap 00 fbh port map 12 00 fch port map 34 r 00 r 00 fdh port map 56 r 00 feh port map 7 r 00 ffh status/command note: smbus register only 00 bit number bit name description 7:0 vid_lsb least significant byte of the vendor id. this is a 16-bit value that uniquely identifies the vendor of the user device (assigned by usb-interface forum). this field is set by the oem using either the smbus or eeprom interface options. bit number bit name description 7:0 vid_msb most significant byte of the vendor id. this is a 16-bit value that uniquely identifies the vendor of the user device (assigned by usb-interface forum). this field is set by the oem using either the smbus or eeprom interface options. table 8.2 internal default, eeprom an d smbus register memory map (continued) address register name default rom valu es (hexidecimal) usb2512/12i usb2512a/12ai usb2513/13i usb2514/14i usb2512b/12bi usb2513b/13bi usb2514b/14bi usb2517/17i usb 2.0 hi-speed hub controller datasheet smsc usb251x 37 revision 1.1 (04-26-10) datasheet 8.2.1.3 register 02h: product id (lsb) 8.2.1.4 register 03h: product id (msb) 8.2.1.5 register 04h: device id (lsb) 8.2.1.6 register 05h: device id (msb) bit number bit name description 7:0 pid_lsb least significant byte of the product id. this is a 16-bit value that the vendor can assign that uniquely i dentifies this particular product (assigned by oem). this field is set by the oem using either the smbus or eeprom interface options. bit number bit name description 7:0 pid_msb most significant byte of the product id. this is a 16-bit value that the vendor can assign that uniquely identifies this particular product (assigned by oem). this field is set by the oem using either the smbus or eeprom interface options. bit number bit name description 7:0 did_lsb least significant byte of the device id. this is a 16-bit device release number in bcd format (assigned by oem). this field is set by the oem using either the smbus or eeprom interface options. bit number bit name description 7:0 did_msb most significant by te of the device id. this is a 16-bit device release number in bcd format (assigned by oem). this field is set by the oem using either the smbus or eeprom interface options. usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 38 smsc usb251x datasheet 8.2.1.7 register 06h: config_byte_1 bit number bit name description 7 self_bus_pwr self or bus power: selects between self- and bus-powered operation. the hub is either self-powered (dra ws less than 2 ma of upstream bus power) or bus-powered (limited to a 100 ma maximum of upstream power prior to being configured by the host controller). when configured as a bus-powered devic e, the smsc hub consumes less than 100 ma of current prior to being c onfigured. after configuration, the bus- powered smsc hub (along with all associated hub circuitry, any embedded devices if part of a compound device, and 100 ma per externally available downstream port) must consume no more than 500 ma of upstream vbus current. the current consumption is system dependent, and the oem must ensure that the usb 2.0 spec ifications are not violated. when configured as a self-powered device, <1 ma of upstream vbus current is consumed and all ports are av ailable, with each port being capable of sourcing 500 ma of current. this field is set by the oem using either the smbus or eeprom interface options. please see the description under dynamic power for the self-/bus- power functionality when dynamic power switching is enabled. '0' = bus-powered operation ?1? = self-powered operation if dynamic power switching is enabled, this bit is ignored and the local_pwr pin is used to determine if the hub is operating from self or bus power. 6 reserved reserved 5 hs_disable hi-speed disable: dis ables the capability to attach as either a hi-/full-speed device, and forces attachment as full -speed only (i.e. no hi-speed support). '0' = hi-/full-speed ?1? = full-speed-only (hi-speed disabled!) 4 mtt_enable multi-tt enable: enables one tr ansaction translator per port operation. (not available on the usb2512a/12ai.) selects between a mode where only one transaction translator is available for all ports (single-tt), or each por t gets a dedicated transaction translator (multi-tt). '0' = single tt for all ports ?1? = one tt per port (when multiple tt's are supported) 3 eop_disable eop disable: disables eop gener ation at eof1 when in full-speed mode. during fs operation only, this permits the hub to send eop if no downstream traffic is detected at eof1 . see section 11.3.1 of the usb 2.0 specification for additional details. '0' = eop generation is normal ?1? = eop generation is disabled usb 2.0 hi-speed hub controller datasheet smsc usb251x 39 revision 1.1 (04-26-10) datasheet 8.2.1.8 register 07h: configuration data byte 2 2:1 current_sns over-current sense: selects cu rrent sensing on a port-by-port basis, all ports ganged, or none (only for bus-powered hubs). the ability to support current sensing on a port or ganged basis is hardware implementation dependent. ?00? = ganged sensing (all ports together) ?01? = individual (port-by-port) ?1x? = over-current sensing not supported (must only be used with bus- powered configurations!) 0 port_pwr port power switchi ng: enables power switching on all ports simultaneously (ganged), or port power is individually switched on and off on a port- by-port basis (individual). the ability to support power enabling on a port or ganged basis is hardware implementation dependent. ?0? = ganged switching (all ports together) ?1? = individual port-by-port switching bit number bit name description 7 dynamic dynamic power enable: controls the ability of the hub to automatically change from self-powered operation to bus-powered operation if the local power source is removed or is unavai lable (and from bus-powered to self- powered if the local power source is restored). when dynamic power switching is enabled, the hub detects the availability of a local power source by monitoring the external local_pwr pin. if the hub detects a change in power source availability, the hub immediately disconnects and removes power from all downstream devices and disconnects the upstream port. the hub will then re-attach to the upstream port as either a bus-powered hub (if local-power is unavailable) or a self- powered hub (if local power is available). ?0? = no dynamic auto-switching ?1? = dynamic auto-switching capable 6 reserved reserved 5:4 oc_timer overcurrent timer: over-current timer delay. ?00? = 0.1 ms ?01? = 4.0 ms ?10? = 8.0 ms ?11? = 16.0 ms 3 compound compound device: allows oem to indicate that the hub is part of a compound (see the usb specification fo r definition) device. the applicable port(s) must also be defined as having a "non-removable device". note: when configured via strapping options, declaring a port as non- removable automatically causes the hu b controller to report that it is part of a compound device. ?0? = no ?1? = yes, the hub is part of a compound device 2:0 reserved reserved bit number bit name description usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 40 smsc usb251x datasheet 8.2.1.9 register 08h: configuration data byte 3 8.2.1.10 register 09h: non-removable device bit number bit name description 7:4 reserved reserved 3 prtmap_en port mapping enable: selects the method used by the hub to assign port numbers and disable ports. ?0? = standard mode ?1? = port mapping mode 2:1 led_mode led mode selection: the led_ a[x:1]_n and led_b[x:1]_n pins support several different modes of operatio n (depending upon oem implementation of the led circuit). ?00' = usb mode ?01? = speed indication mode ?10? = same as ?00?, usb mode ?11? = same as ?00?, usb mode warning: do not enable an led mode that requires led pins that are not available in the specific package being used in the implementation. note: the hub will only report that it supports led's to the host when usb mode is selected. all other modes will be reported as no led support. 0 string_en enables string descriptor support ?0? = string support disabled ?1? = string support enabled bit number bit name description 7:0 nr_device non-removable device: indicates which port(s) include non-removable devices. ?0? = port is removable ?1? = port is non-removable informs the host if one of the active ports has a permanent device that is undetachable from the hub. (note: the device must provide its own descriptor data.) when using the internal default option, the non_rem[1:0] pins will designate the appropriate ports as being non- removable. bit 7= controls port 7 bit 6= controls port 6 bit 5= controls port 5 bit 4= controls port 4 bit 3= controls port 3 bit 2= controls port 2 bit 1= controls port 1 bit 0= reserved usb 2.0 hi-speed hub controller datasheet smsc usb251x 41 revision 1.1 (04-26-10) datasheet 8.2.1.11 register 0ah: port disa ble for self-powered operation 8.2.1.12 register 0bh: port di sable for bus-powered operation bit number bit name description 7:0 port_dis_sp port disable self-pow ered: disables 1 or more ports. 0 = port is available 1 = port is disabled during self-powered operation when mapping mode is disabled (prtmap_en='0'), this selects the ports which will be permanently disabled, and are not available to be enabled or enumerated by a host controller. the ports can be disabled in any order, the internal logic will aut omatically report the correct number of enabled ports to the usb host, and will reorder the active ports in order to ensure proper function. when using the internal default option, the prt_dis_p[x:1] and prt_dis_m[x:1] pins will di sable the appropriate ports. bit 7= controls port 7 bit 6= controls port 6 bit 5= controls port 5 bit 4= controls port 4 bit 3= controls port 3 bit 2= controls port 2 bit 1= controls port 1 bit 0= reserved, always = ?0? bit number bit name description 7:0 port_dis_bp port disable bus-powe red: disables 1 or more ports. 0 = port is available 1 = port is disabled during self-powered operation when mapping mode is disabled (prtmap_en='0'), this selects the ports which will be permanently disabled, and are not available to be enabled or e numerated by a host controller. the ports can be disabled in any order, the internal logic will aut omatically report the correct number of enabled ports to the usb host, and will reorder the active ports in order to ensure proper function. when using the internal default option, the prt_dis_p[x:1] and prt_dis_m[x:1] pins will di sable the appropriate ports. bit 7= controls port 7 bit 6= controls port 6 bit 5= controls port 5 bit 4= controls port 4 bit 3= controls port 3 bit 2= controls port 2 bit 1= controls port 1 bit 0 is reserved, always = ?0? usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 42 smsc usb251x datasheet 8.2.1.13 register 0ch: max powe r for self-powered operation 8.2.1.14 register 0dh: max power for bus-powered operation 8.2.1.15 register 0eh: hub controller max current for self-powered operation 8.2.1.16 register 0fh: hu b controller max current for bus-powered operation bit number bit name description 7:0 max_pwr_sp max power self_powered: value in 2 ma increments t hat the hub consumes from an upstream port (vbus) when operating as a self-powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device, a nd the embedded peripheral reports 0 ma in its descriptors. note: the usb 2.0 specification does not permit this value to exceed 100 ma bit number bit name description 7:0 max_pwr_bp max power bus_powered: value in 2 ma increments t hat the hub consumes from an upstream port (vbus) when op erating as a bus-powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device, a nd the embedded peripheral reports 0 ma in its descriptors. bit number bit name description 7:0 hc_max_c_sp hub controller max current self-powered: value in 2 ma increments that the hub consumes from an upstream port (vbus) when operating as a self- powered hub. this value includes the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value does not include the power consumption of a permanently attached peripheral if the hub is configured as a compound device. note: the usb 2.0 specification does not permit this value to exceed 100 ma a value of 50 (decimal) indicates 100 ma, which is the default value. bit number bit name description 7:0 hc_max_c_bp hub controller max current bus-powered: value in 2 ma increments that the hub consumes from an upstream po rt (vbus) when operating as a bus- powered hub. this value will include the hub silicon along with the combined power consumption (from vbus) of all associated circuitry on the board. this value will not include the pow er consumption of a permanently attached peripheral if the hub is configured as a compound device. a value of 50 (decimal) would indicate 100 ma, which is the default value. usb 2.0 hi-speed hub controller datasheet smsc usb251x 43 revision 1.1 (04-26-10) datasheet 8.2.1.17 register 10h: power-on time 8.2.1.18 register 11h: language id high 8.2.1.19 register 12h: language id low 8.2.1.20 register 13h: manufacturer string length 8.2.1.21 register 14h: product string length 8.2.1.22 register 15h: serial string length bit number bit name description 7:0 power_on_time power-on time: the length of time that it takes (in 2 ms intervals) from the time the host initiated power-on sequence begins on a port until power is adequate on that port. bit number bit name description 7:0 lang_id_h usb language id (upper 8 bits of a 16-bit id field) bit number bit name description 7:0 lang_id_l usb language id (lower 8 bits of a 16-bit id field) bit number bit name description 7:0 mfr_str_len manufacturer string length when supported, the maximum st ring length is 31 characters. bit number bit name description 7:0 prd_str_len product string length when supported, the maximum st ring length is 31 characters. bit number bit name description 7:0 ser_str_len serial string length when supported, the maximum st ring length is 31 characters. usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 44 smsc usb251x datasheet 8.2.1.23 register 16h-53h: manufacturer string 8.2.1.24 register 54h-91h: product string 8.2.1.25 register 92h- cfh: serial string bit number bit name description 7:0 mfr_str manufacturer string, unicod e utf-16le per usb 2.0 specification when supported, the maximum string length is 31 characters (62 bytes). note: the string consists of individual 16-bit unicode utf-16le characters. the characters will be stored starting with the lsb at the least significant address and the msb at the next 8-bit location (subsequent characters must be stored in sequential contiguous address in the same lsb, msb manner). some eeprom programmers may transpose the msb and lsb, thus reversing the byte order. please pay careful attent ion to the byte ordering or your selected programming tools. bit number bit name description 7:0 prd_str product string, unicode utf-16le per usb 2.0 specification when supported, the maximum string length is 31 characters (62 bytes). note: the string consists of individual 16-bit unicode utf-16le characters. the characters will be stored starting with the lsb at the least significant address and the msb at the next 8-bit location (subsequent characters must be stored in sequential contiguous address in the same lsb, msb manner). some eeprom programmers may transpose the msb and lsb, thus reversing the byte order. please pay careful attent ion to the byte ordering or your selected programming tools. bit number bit name description 7:0 ser_str serial string, unicode utf-16le per usb 2.0 specification when supported, the maximum string length is 31 characters (62 bytes). note: the string consists of individual 16-bit unicode utf-16le characters. the characters will be stored starting with the lsb at the least significant address and the msb at the next 8-bit location (subsequent characters must be stored in sequential contiguous address in the same lsb, msb manner). some eeprom programmers may transpose the msb and lsb, thus reversing the byte order. please pay careful attent ion to the byte ordering or your selected programming tools. usb 2.0 hi-speed hub controller datasheet smsc usb251x 45 revision 1.1 (04-26-10) datasheet 8.2.1.26 register d0h: battery charging enable 8.2.1.27 register f6h: boost_up 8.2.1.28 register f7h: boost_7:5 bit number bit name description 7:0 bc_en only available in usb251xb/bi hub family products. battery charging enable: enables the battery charging feature for the corresponding port. '0' = battery charging support is not enabled '1' = battery charging support is enabled bit 7= reserved bit 6= reserved bit 5= reserved bit 4= controls port 4 bit 3= controls port 3 bit 2= controls port 2 bit 1= controls port 1 bit 0= reserved bit number bit name description 7:2 reserved reserved 1:0 boost_iout usb electrical signaling drive strength boost bit for the upstream port. ?00? = normal electrical drive strength = no boost ?01? = elevated electrical drive strength = low (~ 4% boost) ?10? = elevated electrical drive strength = medium (~ 8% boost) ?11? = elevated electrical dr ive strength = high (~12% boost) note: ?boost? could result in non- usb compliant parameters, oem should use a ?00? value unless s pecific implementation issues require additional signal boosting to correct for degraded usb signalling levels. bit number bit name description 7:6 reserved reserved 5:4 boost_iout_7 usb electrical signaling drive strength boost bit for downstream port ?7?. ?00? = normal electrical drive strength = no boost ?01? = elevated electrical drive strength = low (~4% boost) ?10? = elevated electrical drive strength = medium (~ 8% boost) ?11? = elevated electrical dr ive strength = high (~12% boost) 3:2 boost_iout_6 usb electrical signaling drive strength boost bit for downstream port ?6?. ?00? = normal electrical drive strength = no boost ?01? = elevated electrical drive strength = low (~4% boost) ?10? = elevated electrical drive strength = medium (~ 8% boost) ?11? = elevated electrical dr ive strength = high (~12% boost) usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 46 smsc usb251x datasheet note: ?boost? could result in non-usb compliant parameters, oem should use a ?00? value unless specific implementation issues require additional signal boosting to correct for degraded usb signalling levels. 8.2.1.29 register f8h: boost_4:0 note: ?boost? could result in non-usb compliant parameters, oem should use a ?00? value unless specific implementation issues require additional signal boosting to correct for degraded usb signalling levels. 1:0 boost_iout_5 usb electrical signaling drive strength boost bit for downstream port ?5?. ?00? = normal electrical drive strength = no boost ?01? = elevated electrical drive strength = low (~4% boost) ?10? = elevated electrical drive strength = medium (~ 8% boost) ?11? = elevated electrical dr ive strength = high (~12% boost) bit number bit name description 7:6 boost_iout_4 usb electrical signaling drive strength boost bit for downstream port ?4?. ?00? = normal electrical drive strength = no boost ?01? = elevated electrical drive strength = low (~4% boost) ?10? = elevated electrical drive strength = medium (~ 8% boost) ?11? = elevated electrical dr ive strength = high (~12% boost) 5:4 boost_iout_3 usb electrical signaling drive strength boost bit for downstream port ?3?. ?00? = normal electrical drive strength = no boost ?01? = elevated electrical drive strength = low (~4% boost) ?10? = elevated electrical drive strength = medium (~ 8% boost) ?11? = elevated electrical dr ive strength = high (~12% boost) 3:2 boost_iout_2 usb electrical signaling drive strength boost bit for downstream port ?2?. ?00? = normal electrical drive strength = no boost ?01? = elevated electrical drive strength = low (~4% boost) ?10? = elevated electrical drive strength = medium (~ 8% boost) ?11? = elevated electrical dr ive strength = high (~12% boost) 1:0 boost_iout_1 usb electrical signaling drive strength boost bit for downstream port ?1?. ?00? = normal electrical drive strength = no boost ?01? = elevated electrical drive strength = low (~4% boost) ?10? = elevated electrical drive strength = medium (~ 8% boost) ?11? = elevated electrical dr ive strength = high (~12% boost) bit number bit name description usb 2.0 hi-speed hub controller datasheet smsc usb251x 47 revision 1.1 (04-26-10) datasheet 8.2.1.30 register fah: port swap bit number bit name description 7:0 prtsp port swap: swaps the upstream a nd downstream usb dp and dm pins for ease of board routing to devices and connectors. ?0? = usb d+ functionality is associated with the dp pin and d- functionality is associated with the dm pin. ?1? = usb d+ functionality is associated with the dm pin and d- functionality is associated with the dp pin. bit 7= controls port 7 bit 6= controls port 6 bit 5= controls port 5 bit 4= controls port 4 bit 3= controls port 3 bit 2= controls port 2 bit 1= controls port 1 bit 0= when this bit is ?1?, the upstream port dp/dm is swapped. usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 48 smsc usb251x datasheet 8.2.1.31 register fbh: portmap 12 bit number bit name description 7:0 prtr12 portmap register for ports 1 & 2. when a hub is enumerated by a usb host controller, the hub is only permitted to report how many ports it ha s; the hub is not permitted to select a numerical range or assignment. the host controller will number the downstream ports of the hub starting with the number '1', up to the number of ports that the hub reported having. the host's port number is referred to as "logical port number" and the physical port on the hub is the ?physical port number". when mapping mode is enabled (see prtmap_en in register 08h: configuration data byte 3) the hub's downstream port numbers ca n be mapped to different logical port numbers (assigned by the host). note: oem must ensure that contiguous logical port numbers are used, starting from #1 up to the maximum number of enabled ports; this ensures that the hub's ports are numbered in accordance with the way a host will communicate with the ports. table 8.3 portmap register for ports 1 & 2 bit [7:4] ?0000? physical port 2 is disabled ?0001? physical port 2 is mapped to logical port 1 ?0010? physical port 2 is mapped to logical port 2 ?0011? physical port 2 is mapped to logical port 3 ?0100? physical port 2 is mapped to logical port 4 ?0101? physical port 2 is mapped to logical port 5 ?0100? physical port 2 is mapped to logical port 6 ?0111? physical port 2 is mapped to logical port 7 ?1000? to ?1111? reserved, will default to ?0000? value bit [3:0] ?0000? physical port 1 is disabled ?0001? physical port 1 is mapped to logical port 1 ?0010? physical port 1 is mapped to logical port 2 ?0011? physical port 1 is mapped to logical port 3 ?0100? physical port 1 is mapped to logical port 4 ?0101? physical port 1 is mapped to logical port 5 ?0110? physical port 1 is mapped to logical port 6 ?0111? physical port 1 is mapped to logical port 7 ?1000? to ?1111? reserved, will default to ?0000? value usb 2.0 hi-speed hub controller datasheet smsc usb251x 49 revision 1.1 (04-26-10) datasheet 8.2.1.32 register fch: portmap 34 bit number bit name description 7:0 prtr34 portmap register for ports 3 & 4. when a hub is enumerated by a usb host controller, the hub is only permitted to report how many ports it ha s; the hub is not permitted to select a numerical range or assignment. the host controller will number the downstream ports of the hub starting with the number '1', up to the number of ports that the hub reported having. the host's port number is referred to as "logical port number" and the physical port on the hub is the ?physical port number". when mapping mode is enabled (see prtmap_en in register 08h: configuration data byte 3) the hub's downstream port numbers ca n be mapped to different logical port numbers (assigned by the host). note: oem must ensure that contiguous logical port numbers are used, starting from #1 up to the maximum number of enabled ports; this ensures that the hub's ports are numbered in accordance with the way a host will communicate with the ports. table 8.4 portmap register for ports 3 & 4 bit [7:4] ?0000? physical port 4 is disabled ?0001? physical port 4 is mapped to logical port 1 ?0010? physical port 4 is mapped to logical port 2 ?0011? physical port 4 is mapped to logical port 3 ?0100? physical port 4 is mapped to logical port 4 ?0101? physical port 4 is mapped to logical port 5 ?0100? physical port 4 is mapped to logical port 6 ?0111? physical port 4 is mapped to logical port 7 ?1000? to ?1111? reserved, will default to ?0000? value bit [3:0] ?0000? physical port 3 is disabled ?0001? physical port 3 is mapped to logical port 1 ?0010? physical port 3 is mapped to logical port 2 ?0011? physical port 3 is mapped to logical port 3 ?0100? physical port 3 is mapped to logical port 4 ?0101? physical port 3 is mapped to logical port 5 ?0110? physical port 3 is mapped to logical port 6 ?0111? physical port 3 is mapped to logical port 7 ?1000? to ?1111? reserved, will default to ?0000? value usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 50 smsc usb251x datasheet 8.2.1.33 register fdh: portmap 56 bit number bit name description 7:0 prtr56 portmap register for ports 5 & 6. when a hub is enumerated by a usb host controller, the hub is only permitted to report how many ports it ha s; the hub is not permitted to select a numerical range or assignment. the host controller will number the downstream ports of the hub starting with the number '1', up to the number of ports that the hub reported having. the host's port number is referred to as "logical port number" and the physical port on the hub is the ?physical port number". when mapping mode is enabled (see prtmap_en in register 08h: configuration data byte 3) the hub's downstream port numbers ca n be mapped to different logical port numbers (assigned by the host). note: oem must ensure that contiguous logical port numbers are used, starting from #1 up to the maximum number of enabled ports; this ensures that the hub's ports are numbered in accordance with the way a host will communicate with the ports. table 8.5 portmap register for ports 5 & 6 bit [7:4] ?0000? physical port 6 is disabled ?0001? physical port 6 is mapped to logical port 1 ?0010? physical port 6 is mapped to logical port 2 ?0011? physical port 6 is mapped to logical port 3 ?0100? physical port 6 is mapped to logical port 4 ?0101? physical port 6 is mapped to logical port 5 ?0100? physical port 6 is mapped to logical port 6 ?0111? physical port 6 is mapped to logical port 7 ?1000? to ?1111? reserved, will default to ?0000? value bit [3:0] ?0000? physical port 5 is disabled ?0001? physical port 5 is mapped to logical port 1 ?0010? physical port 5 is mapped to logical port 2 ?0011? physical port 5 is mapped to logical port 3 ?0100? physical port 5 is mapped to logical port 4 ?0101? physical port 5 is mapped to logical port 5 ?0110? physical port 5 is mapped to logical port 6 ?0111? physical port 5 is mapped to logical port 7 ?1000? to ?1111? reserved, will default to ?0000? value usb 2.0 hi-speed hub controller datasheet smsc usb251x 51 revision 1.1 (04-26-10) datasheet 8.2.1.34 register feh: portmap 7 bit number bit name description 7:0 prtr7 portmap register for port 7. when a hub is enumerated by a usb host controller, the hub is only permitted to report how many ports it ha s; the hub is not permitted to select a numerical range or assignment. the host controller will number the downstream ports of the hub starting with the number '1', up to the number of ports that the hub reported having. the host's port number is referred to as "logical port number" and the physical port on the hub is the ?physical port number". when mapping mode is enabled (see prtmap_en in register 08h: configuration data byte 3) the hub's downstream port numbers ca n be mapped to different logical port numbers (assigned by the host). note: oem must ensure that contiguous logical port numbers are used, starting from #1 up to the maximum number of enabled ports; this ensures that the hub's ports are numbered in accordance with the way a host will communicate with the ports. table 8.6 portmap register for port 7 bit [7:4] ?0000? to ?1111? reserved bit [3:0] ?0000? physical port 7 is disabled ?0001? physical port 7 is mapped to logical port 1 ?0010? physical port 7 is mapped to logical port 2 ?0011? physical port 7 is mapped to logical port 3 ?0100? physical port 7 is mapped to logical port 4 ?0101? physical port 7 is mapped to logical port 5 ?0110? physical port 7 is mapped to logical port 6 ?0111? physical port 7 is mapped to logical port 7 ?1000? to ?1111? reserved, will default to ?0000? value usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 52 smsc usb251x datasheet 8.2.1.35 register ffh: status/command 8.2.2 i 2 c eeprom the i 2 c eeprom interface implem ents a subset of the i 2 c master specification (please refer to the philips semiconductor standard i 2 c-bus specification for details on i 2 c bus protocols). the smsc hub?s i 2 c eeprom interface is designed to attach to a single ?dedicated? i 2 c eeprom, and it conforms to the standard-mode i 2 c specification (100 kb it/s transfer rate and 7-bit addressing) for protocol and electrical compatibility. note: extensions to the i 2 c specification ar e not supported. the hub acts as the master and generates the serial clock scl, controls the bus access (determines which device acts as the transmitter and which devic e acts as the receiver), and generates the start and stop conditions. 8.2.2.1 implementation characteristics the hub will only access an eeprom us ing the sequential read protocol. 8.2.2.2 pull-up resistor the circuit board designer is required to place external pull-up resistors (10 k recommended) on the sda / smbdata and scl / smbclk / cfg_sel[0] li nes (per smbus 1.0 specification, and eeprom manufacturer guidelines) to vdd33 in order to assure proper operation. 8.2.2.3 i 2 c eeprom slave address the slave address is 1010000. note: 10-bit addressing is not supported. 8.2.3 in-circuit eeprom programming the eeprom can be programmed via ate (automatic test equipment) by pulling reset_n low (which tri-states the hub?s eeprom interface and allows an external source to program the eeprom). bit number bit name description 7:3 reserved reserved 2 intf_pw_dn smbus interface power down ?0? = interface is active ?1? = interface power down after ack has completed 1 reset reset the smbus interface and internal memory back to reset_n assertion default settings. ?0? = normal run/idle state ?1? = force a reset of registers to their default state 0 usb_attach usb attach (and write protect) ?0? = smbus slave interface is active ?1? = the hub will signal a usb attach event to an upstream device, and the internal memory (address range 00h-feh) is ?write-protected? to prevent unintentional data corruption. usb 2.0 hi-speed hub controller datasheet smsc usb251x 53 revision 1.1 (04-26-10) datasheet 8.3 smbus slave interface instead of loading user-defined descriptor data from an external eeprom, the smsc hub can be configured to receive a code load from an external processor via an smbus interface. the smbus interface shares the same pins as the eeprom interface; if cfg_ sel[1] & cfg_sel[0] activate the smbus interface, external eeprom support is no lo nger available (and the user-defined descriptor data must be downloaded via the smbus). the smsc hub waits indefinitely for the smbus code load to complete and only ?appears? as a newly connected device on usb after the code load is complete. the hub?s smbus implementation is a slave-only smbus device. the implementation only supports read block and write block protocols. the hub responds to other protocols as described in section 8.3.3, "invalid protocol response behavior," on page 54 . reference the system management bus specification, rev 1.0. the smbus interface is used to read and write the re gisters in the device. the register set is shown in section 8.2.1, "internal re gister set (common to eeprom and smbus)," on page 35 . 8.3.1 smbus slave addresses the smbus slave address is 58h (01011000b). 8.3.2 bus protocols typical write block and read block protocols are shown below. register accesses are performed using 7-bit slave addressing, an 8-bit register add ress field, and an 8-bit data field. the shading indicates the hub driving data on the smbdata lin e; otherwise, host data is on the sda/smbdata line. the slave address is the unique smbus interface addr ess for the hub that identifies it on smbus. the register address field is the internal address of the register to be accessed. the register data field is the data that the host is attempting to write to the r egister or the contents of the register that the host is attempting to read. note: data bytes are transferred msb first. 8.3.2.1 block read/write the block write begins with a slave address and a write condition. after the command code, the host issues a byte count which describes how many more bytes will follow in the message. if a slave had 20 bytes to send, the first byte would be the number 20 (14h), followed by the 20 bytes of data. the byte count may not be 0. a block read or write is allowed to transfer a maximum of 32 data bytes. note: for the following smbus tables: figure 8.1 block write denotes master-to-slave denotes slave-to-master 1 81 s slave address register address wr a 17118 a 1 ... byte count = n a data byte 1 a data byte 2 81 1 1 88 data byte n a p block write a usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 54 smsc usb251x datasheet 8.3.2.2 block read a block read differs from a block write in that the repeated start condition exists to satisfy the i 2 c specification?s requirement for a ch ange in the transfer direction. figure 8.2 block read 8.3.3 invalid protocol response behavior registers that are accessed with an invalid prot ocol are not updated. a register is only updated following a valid protocol. the only valid protocols are write block and read block, which are described above. the hub only responds to the hardware selected slave address (0101100x). attempting to communicate with the hub over smbus with an invalid slave address or invalid protocol results in no response, and the smbus slave interface returns to the idle state. the only valid registers that are accessible by t he smbus slave address are the registers defined in the registers section. the hub does not respond to undefined registers. 8.3.4 general call address response the hub does not respond to a general call address of 0000_000b. 8.3.5 slave device time-out according to the smbus specification, version 1. 0 devices in a transfer can abort the transfer in progress and release the bus when any single clock low interval exceeds 25 ms (t timeout, min ). devices that have detected this condition must reset their communic ation and be able to receive a new start condition no later than 35 ms (t timeout, max ). note: some simple devices do not contain a clock low drive circuit; this simple kind of device typically resets its communications port after a start or stop condition. the slave device time-out must be implemented. 8.3.6 stretching the sclk signal the hub supports stretching of the sclk by other devices on the smbus. the hub does not stretch the sclk. 8.3.7 smbus timing the smbus slave interface complies with the smbus ac timing specification. see the smbus timing in the ?timing diagram? section. 8.3.8 bus reset sequence the smbus slave interface resets and returns to the idle state upon a start field followed immediately by a stop field. block read 1 s s slave address register address wr a 17118 a 1 slave address rd a 711 81 1 1 88 p 1 81 a a a a byte count = n data byte 1 data byte 2 data byte n ... usb 2.0 hi-speed hub controller datasheet smsc usb251x 55 revision 1.1 (04-26-10) datasheet 8.3.9 smbus alert response address the smbalert# signal is not supported by the hub. 8.3.9.1 undefined registers the registers shown in ta b l e 8 . 2 are the defined registers in the hub. reads to undefined registers return 00h. writes to undefined registers have no effect and do not return an error. 8.3.9.2 reserved registers reserved registers should be written to ?0? unless otherwise specified. contents read should be ignored. 8.4 default configuration option to configure the smsc hub in its default configur ation, strap cfg_sel[2:0] to 00h. this procedure configures the hub to the internal defaults and enables the strapping options. please see section 8.2.1, "internal register set (common to eeprom and smbus)" for the list of the default values. for specific pin strapping options, please see chapter 5, pin descriptions for instructions on how to modify the default values. options include port disable and non-removable pin strapping. 8.5 default strapping options the usb251x can be configured via a combination of internal default values and pin strap options. please see ta b l e 8 . 2 for specific details on how to enable th e default/pin-strap c onfiguration option. the strapping option pins only cover a limited sub-set of the configuration options. the internal default values will be used for the bits & registers that ar e not controlled by a strapping option pin. please refer to table 8.2 for the internal default values that ar e loaded when this option is selected. 8.6 strap options table 8.7 summary of strap options 8.6.1 non-removable strap option the strap function of the non_rem[x:0] pins are enabled through the internal default configuration. the driver type of each strap pin is i/o (no internal pull-up or pul l-down for the input function). use this type of strap option for non_rem[1:0]. figure 8.3 shows an example of strap high and strap low. use the strap high configuration to set the strap option value to a ?1?. use the strap low configuration to set the strap option value to ?0?. part number usb251x usb251xi usb251xa usb251xai usb251xb usb251xbi resistor value (r) notes normal 3 3 47 - 100 k internal pull-down 3 10 k ? only applicable to port power pins. ? contains a built-in resistor. led 3 3 47 - 100 k usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 56 smsc usb251x datasheet figure 8.3 non-removable pin strap example 8.6.2 internal pull-down (ipd) if a pin's strap function is enabled thru hub configuration selection, ( table 8.1 hub configuration selection) and the strap pins driv er type is ipd/o (internal pull-dow n for the input function), use this type of strap option. the following figure shows an example of strap high and strap low. use the strap high configuration to set the strap option value to a ?1?. use the strap low configuration to set the strap option value to 0. figure 8.4 pin strap option with ipd pin example 8.6.3 led strap option if a pin?s strap function of the led pins are enabled thru the internal default configuration, the driver type of each strap pin is i/o (no internal pull-up or pull-down for the input function). when the strap pin shares functionality with an le d, use this type of strap option. the internal logic will drive the led appropriately (active high or low) depending on the sampled strap option. figure 8.5 shows an example of strap high and strap low. use the strap high configuration to set the strap option value to a ?1?. use the strap low configuration to set the strap option value to ?0?. figure 8.5 led pin strap example hub strap pin primary function/ strap high +v hub strap pin primary function/ strap low gnd r k r k hub strap pin (ipd) primary function/ strap high r k +v vss hub strap pin (ipd) primary function/ strap low vss hub strap pin led/ strap high hub strap pin led/ strap low r k r k usb 2.0 hi-speed hub controller datasheet smsc usb251x 57 revision 1.1 (04-26-10) datasheet usb2513/13i and usb2514/14i only: the led_a[x:1]_n pins are sampled after reset_n negation, and the logic values are used to co nfigure the hub if the internal defa ult configuration mode is selected. the implementation shown in figure 8.5 shows a recommended passive scheme. when a pin is configured with a "strap high" config uration, the led functions with ac tive low signaling, and the pad will "sink" the current from the external suppl y. when a pin is configured with a "strap low" configuration, the led func tions with active high signaling, and the pad will source the current to the external led. 8.7 reset there are two different resets th at the hub exper iences. one is a hardwa re reset via the reset_n pin and the second is a usb bus reset. 8.7.1 external hardware reset_n a valid hardware reset is defined as assertion of reset_n for a minimum of 1 s after all power supplies are within operating range. while reset is asserted, the hub (and its associated external circuitry) consumes less than 500 a of current from the upstream usb power source. assertion of reset_n (external pin) causes the following: 1. all downstream ports are disabled, and prtpwr power to downstream devices is removed (unless bc_en is enabled). 2. the phys are disabled, and the differential pairs will be in a high-impedance state. 3. all transactions immediately terminate; no states are saved. 4. all internal registers return to the default state (in most cases, 00(h)). 5. the external crystal oscillator is halted. 6. the pll is halted. the hub is ?operational? 500 s after reset_n is negated. once operational, the hub immediately reads oem-specific data from the external eeprom (if the smbus option is not disabled). 8.7.1.1 reset_n for strappin g option configuration figure 8.6 reset_n timing fo r default/stra p option mode t1 t4 t5 t6 t7 t8 valid driven by hub if strap is an output. reset_n vss strap pins vss hardware reset asserted read strap options drive strap outputs to inactive levels attach usb upstream usb reset recovery idle start completion request response t2 t3 don?t care don?t care usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 58 smsc usb251x datasheet notes: ? when in bus-powered mode, the hub and its associ ated circuitry must not consume more than 100 ma from the upstream usb power source during t1+t5. ? all power supplies must have reached the operating levels mandated in chapter 9, dc parameters , prior to (or coincident with) the assertion of reset_n. 8.7.1.2 reset_n for eeprom configuration figure 8.7 reset_n ti ming for eeprom mode table 8.8 reset_n timing fo r default/strap option mode name description min typ max units t1 reset_n asserted. 1 sec t2 strap setup time 16.7 nsec t3 strap hold time. 16.7 1400 nsec t4 hub outputs driven to inactive logic states 1.5 2 sec t5 usb attach (see note). 100 msec t6 host acknowledges attach and signals usb reset. 100 msec t7 usb idle. undefined msec t8 completion time for requests (with or without data stage). 5 msec table 8.9 reset_n ti ming for eeprom mode name description min typ max units t1 reset_n asserted. 1 sec t2 hub recovery/stabilization. 500 sec t3 eeprom read / hub config. 2.0 99.5 msec t4 usb attach (see note). 100 msec t1 t2 t4 t5 t6 t7 reset_n vss hardware reset asserted read strap options read eeprom + set options attach usb upstream usb reset recovery idle start completion request response t3 usb 2.0 hi-speed hub controller datasheet smsc usb251x 59 revision 1.1 (04-26-10) datasheet notes: ? when in bus-powered mode, the hub and its associ ated circuitry must not consume more than 100 ma from the upstream usb pow er source during t4+t5+t6+t7. ? all power supplies must have reached the operating levels mandated in chapter 9, dc parameters , prior to (or coincident with) the assertion of reset_n. 8.7.1.3 reset_n for smbus slave configuration figure 8.8 reset_n timing for smbus mode notes: ? for bus-powered configurations, the 99.5 ms (max) is required, and the hub and its associated circuitry must not consume more than 100 ma from the upstream usb power source during t5 host acknowledges attach and signals usb reset. 100 msec t6 usb idle. undefined msec t7 completion time for requests (with or without data stage). 5 msec table 8.10 reset_n timing for smbus mode name description min typ max units t1 reset_n asserted. 1 sec t2 hub recovery/stabilization. 500 sec t3 smbus code load (see note). 250 300 msec t4 hub configuration and usb attach. 100 msec t5 host acknowledges attach and signals usb reset. 100 msec t6 usb idle. undefined msec t7 completion time for requests (with or without data stage). 5 msec table 8.9 reset_n timing for eeprom mode (continued) name description min typ max units t1 t2 t4 t5 t6 t7 reset_n vss hardware reset asserted reset negation smbus code load attach usb upstream usb reset recovery idle start completion request response t3 hub phy stabilization usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 60 smsc usb251x datasheet t2+t3+t4+t5+t6+t7. for self-powered configurations , t3 max is not applicable and the time to load the configuration is determin ed by the external smbus host. ? all power supplies must have reached the operating levels mandated in chapter 9, dc parameters , prior to (or coincident with) the assertion of reset_n. 8.7.2 usb bus reset in response to the upstream port signaling a reset to the hub, the hub does the following: note: the hub does not propagate the upstre am usb reset to downstream devices. 1. sets default address to 0. 2. sets configuration to: unconfigured. 3. negates prtpwr[x:1] to all downstream ports unless battery charging (bc_en) is enabled. 4. clears all tt buffers. 5. moves device from suspended to active (if suspended). 6. complies with section 11.10 of t he usb 2.0 specification for behavio r after completion of the reset sequence. the host then configures the hub and t he hub?s downstream port devices in accordance with the usb sp ecification. note: the hub does not propagate the upstre am usb reset to downstream devices. usb 2.0 hi-speed hub controller datasheet smsc usb251x 61 revision 1.1 (04-26-10) datasheet chapter 9 dc parameters 9.1 maximum guaranteed ratings note 9.1 stresses above the specified parameters co uld cause permanent damage to the device. this is a stress rating only and functional operation of the device at any condition above those indicated in the operation sections of this specification is not implied. note 9.2 when powering this device from laboratory or system power supplies, it is important that the absolute maximum ratings not be exceeded or device failure can result. some power supplies exhibit voltage spikes on their outputs when the ac power is switched on or off. in addition, voltage transients on the ac power line may appear on the dc output. when this possibility exists, it is suggested that a clamp circuit be used. 9.2 operating conditions parameter symbol min max units comments storage temperature t stor -55 150 c lead temperature refer to jedec specification j-std- 020d. 3.3 v supply voltage vdd33 pllfilt crfilt 4.6 v applies to all parts. voltage on any i/o pin -0.5 5.5 v voltage on xtalin -0.5 4.0 v voltage on xtalout -0.5 2.5 v parameter symbol min max units comments commercial operating temperature t a 070c ambient temperature in still air. only applies to usb251x and usb251xa products. extended commercial operating temperature t ae 085c ambient temperature in still air. only applies to usb251xb products. industrial operating temperature t ai -40 85 c ambient temperature in still air. only applies to usb251xi, usb251xai, and usb251xbi products. 3.3 v supply voltage vdd33 3.0 3.6 v applies to all parts. 3.3 v supply rise time t rt 0 400 s see figure 9.1 usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 62 smsc usb251x datasheet figure 9.1 supply rise time model voltage on any i/o pin -0.3 5.5 v if any 3.3 v supply voltage drops below 3.0 v, then the max becomes: (3.3 v supply voltage) + 0.5 voltage on xtalin -0.3 vdd33 v table 9.1 dc electrical characteristics parameter symbol min typ max units comments i, is type input buffer low input level high input level input leakage hysteresis (?is? only) v ili v ihi i il v hysi 2.0 -10 250 0.8 +10 350 v v a mv ttl levels v in = 0 to vdd33 input buffer with pull-up (ipu) low input level high input level low input leakage high input leakage v ili v ihi i ill i ihl 2.0 +35 -10 0.8 +90 +10 v v a a ttl levels v in = 0 v in = vdd33 input buffer with pull-down (ipd) low input level high input level low input leakage high input leakage v ili v ihi i ill i ihl 2.0 +10 -35 0.8 -10 -90 v v a a ttl levels v in = 0 v in = vdd33 parameter symbol min max units comments t 10% 10% 90% voltage t rt t 90% time 100% 3.3 v vss vdd33 usb 2.0 hi-speed hub controller datasheet smsc usb251x 63 revision 1.1 (04-26-10) datasheet note 9.3 output leakage is measured with the current pins in high impedance. note 9.4 see usb 2.0 specification for u sb dc electrical characteristics. usb251x/xi/xa/xai iclk input buffer low input level high input level input leakage v ilck v ihck i il 1.4 -10 0.5 +10 v v a v in = 0 to vdd33 usb251xb/xbi iclk input buffer low input level high input level input leakage v ilck v ihck i il 0.9 -10 0.3 +10 v v a v in = 0 to vdd33 o12, i/o12 &i/osd12 type buffer low output level high output level output leakage hysteresis (?sd? pad only) v ol v oh i ol v hysc 2.4 -10 250 0.4 +10 350 v v a mv i ol = 12 ma @ vdd33 = 3.3 v i oh = -12 ma @ vdd33 = 3.3 v v in = 0 to vdd33 ( note 9.1 ) table 9.2 supply current unconfigured: hi-speed host (i ccinths ) part min typ max units comments usb2512/12i/12a/12ai 90 95 ma usb2512b/12bi 40 45 usb2513/13i 95 105 usb2513b/13bi 40 45 usb2514/14i 95 105 usb2514b/14bi 45 50 usb2517/17i 120 130 table 9.1 dc electrical characteristics (continued) parameter symbol min typ max units comments usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 64 smsc usb251x datasheet table 9.3 supply current unconfigured: full-speed host (i ccintfs ) part min typ max units comments usb2512/12i/12a/12ai 80 85 ma usb2512b/12bi 35 40 usb2513/13i 80 90 usb2513b/13bi 35 40 usb2514/14i 80 90 usb2514b/14bi 35 40 usb2517/17i 105 115 table 9.4 supply current configured: hi-speed host (i hch1 ) part min typ max units comments usb2512 130 155 ma this is the base current of one downstream port. usb2512i 130 160 usb2512a 120 145 usb2512ai 120 150 usb2512b 60 65 usb2512bi 60 70 usb2513 150 180 usb2513i 150 185 usb2513b 65 70 usb2513bi 65 75 usb2514 155 200 usb2514i 155 205 usb2514b 70 80 usb2514bi 70 85 usb2517 240 275 usb2517i 240 280 usb 2.0 hi-speed hub controller datasheet smsc usb251x 65 revision 1.1 (04-26-10) datasheet usb251x/xi/xa/xai supply current configured hi-speed host , each additional downstream port 1 port base + 15 ma 1 port base + 40 ma ma usb251xb/xbi supply current configured hi-speed host , each additional downstream port 1 port base + 25 ma 1 port base + 25 ma ma table 9.5 supply current configured: full-speed host (i fcc1 ) part min typ max units comments usb2512 105 125 ma this is the base current of one downstream port. usb2512i 105 135 usb2512a 95 115 usb2512ai 95 125 usb2512b 45 50 usb2512bi 45 55 usb2513 125 135 usb2513i 125 140 usb2513b 50 55 usb2513bi 50 60 usb2514 140 150 usb2514i 140 155 usb2514b 50 60 usb2514bi 50 65 usb2517 215 220 usb2517i 215 225 usb251x/xi/xa/xai supply current configured full-speed host , each additional downstream port 1 port base + 0 ma 1 port base + 0 ma ma there is no additional current for additional ports. usb251xb/xbi supply current configured full-speed host , each additional downstream port 1 port base + 8 ma 1 port base + 8 ma ma table 9.4 supply current configured: hi-speed host (i hch1 ) part min typ max units comments usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 66 smsc usb251x datasheet table 9.6 usb251x/xi/xa/xai supply current suspend (i csby ) part min typ max units comments usb2512/12a 310 420 a all supplies combined usb2512i/12ai 310 600 usb2513 310 420 usb2513i 310 550 usb2514 310 420 usb2514i 310 600 usb2517 310 610 usb2517i 310 800 table 9.7 usb251xb/xbi supply current suspend (i csby ) part min typ max units comments usb2512b 475 1000 a all supplies combined usb2512bi 475 1200 usb2513b 500 1100 usb2513bi 500 1300 usb2514b 550 1200 usb2514bi 550 1500 table 9.8 usb251x/xi/xa/xai supply current reset (i crst ) part min typ max units comments usb2512/12a 105 275 a all supplies combined usb2512i/12ai 105 400 usb2513 105 230 usb2513i 100 350 usb2514 100 275 usb2514i 100 400 usb2517 115 320 usb2517i 115 600 usb 2.0 hi-speed hub controller datasheet smsc usb251x 67 revision 1.1 (04-26-10) datasheet note 9.5 capacitance t a = 25c; fc = 1 mhz; vdd33 = 3.3 v table 9.9 usb251xb/xbi supply current reset (i crst ) part min typ max units comments usb2512b 550 1100 a all supplies combined usb2512bi 550 1250 usb2513b 650 1200 usb2513bi 650 1400 usb2514b 750 1400 usb2514bi 750 1600 table 9.10 pin capacitance for usb2 51x, usb251xi, usb251xa, usb251xai limits parameter symbol min typ max unit test condition clock input capacitance c xtal 2 pf all pins except usb pins and the pins under the test tied to ac ground. input capacitance c in 10 pf (see note 9.5 ) output capacitance c out 20 pf table 9.11 pin capacitance for usb251xb and usb251xbi limits parameter symbol min typ max unit test condition clock input capacitance c xtal 6 pf all pins except usb pins and the pins under the test tied to ac ground. input capacitance c in 6 pf (see note 9.5 ) output capacitance c out 6pf usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 68 smsc usb251x datasheet 9.2.1 package thermal specifications thermal parameters are measured or estimated for dev ices with the exposed pad soldered to thermal vias in a multilayer 2s2p pcb per jesd51. ther mal resistance is measured from the die to the ambient air. the values provided are based on the package body, die size, maximum power consumption, 85c ambient te mperature, and 125c juncti on temperature of the die. table 9.12 package thermal resistance parameters use the following formulas to calc ulate the junction temperature: t j = p x ja + t a t j = p x jt + t t t j = p x jc + t c table 9.13 legend symbol usb2512/12i usb2513/13i usb2514/14i ( c/w ) usb2512a/12ai ( c/w ) usb2512b/12bi usb2513b/13bi usb2514b/14bi ( c/w ) usb2513/13i usb2514/14i ( c/w ) velocity (meters/sec) package 36-pin qfn 48-pin qfn - ja 34.2 36.2 40.1 31.6 0 29.9 33.4 35.0 27.6 1 jt 0.3 0.4 0.5 0.3 0 0.5 0.7 0.7 0.4 1 jc 3.0 5.1 6.3 3.0 0 3.0 5.1 6.3 3.0 1 symbol description t j junction temperature p power dissipated ja junction-to-ambient-temperature jc junction-to-top-of-package jt junction-to-bottom-of-case t a ambient temperature t c temperature of the bottom of the case t t temperature of the top of the case usb 2.0 hi-speed hub controller datasheet smsc usb251x 69 revision 1.1 (04-26-10) datasheet chapter 10 ac specifications 10.1 oscillator/crystal crystal: parallel resonant, fundamental mode, 24/48 1 mhz 350 ppm. external clock: 50% duty cycle 10%, 24/48 mhz 350 ppm, jitter < 100 ps rms. figure 10.1 typical crystal circuit table 10.1 crystal circuit legend figure 10.2 formula to find the value of c 1 and c 2 note 10.1 c 0 is usually included (subtracted by the crys tal manufacturer) in the specification for c l and should be set to ?0? for use in the calculation of the capacitance formulas in figure 10.2, "formula to find the value of c1 and c2" . however, the oem pcb itself may present a parasitic capacitance between xtalin and xtalout. for an accurate calculation of c 1 and c 2 , take the parasitic capacitance between traces xtalin and xtalout into account. note 10.2 each of these capacitance values is typically approximately 18 pf. 1.only when sel48 is available and supported. symbol description in accordance with c 0 crystal shunt capacitance crystal manufacturer?s specification (see note 10.1 ) c l crystal load capacitance c b total board or trace capacitance oem board design c s stray capacitance smsc ic and oem board design c xtal xtal pin input capacitance smsc ic c 1 load capacitors installed on oem board calculated values based on figure 10.2, "formula to find the value of c1 and c2" (see note 10.2 ) c 2 xtal1 (c s1 = c b1 + c xtal1 ) xtal2 (c s2 = c b2 + c xtal2 ) c 1 c 2 c l 1 m crystal c 0 c 1 = 2 x (c l ? c 0 ) ? c s1 c 2 = 2 x (c l ? c 0 ) ? c s2 usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 70 smsc usb251x datasheet 10.2 ceramic resonator 24 mhz 350 ppm figure 10.3 ceramic resonator usage with smsc ic 10.3 external clock 50% duty cycle 10%, 24 mhz 350 ppm, jitter < 100 ps rms. the external clock is recomm ended to conform to the signaling level designated in the jesd76-2 specification on 1.8 v cmos logic. xtal out should be treated as a no connect. 10.3.1 smbus interface the smsc hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the smbus 1.0 specification for slave-only devices (except as noted in section 8.3, "smbus slave interface," on page 53 . 10.3.2 i 2 c eeprom clock frequency is fixed at 60 khz 20 %. 10.3.3 usb 2.0 the smsc hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the usb 2.0 specification. please refer to the usb 2.0 specification for more information. xtal1 xtal2 1 m 24 mhz ceramic resonator usb 2.0 high-speed 2-port hub controller datasheet revision 1.1 (04-26-10) 71 smsc usb251x datasheet chapter 11 package outlines figure 11.1 36-pin qfn, 6x6 mm body, 0.5 mm pitch usb 2.0 high-speed 2-port hub controller datasheet revision 1.1 (04-26-10) 72 smsc usb251x datasheet figure 11.2 48-pin qfn, 7x7 mm body, 0.5 mm pitch usb 2.0 high-speed 2-port hub controller datasheet revision 1.1 (04-26-10) 73 smsc usb251x datasheet figure 11.3 64-pin qfn, 9x9 mm body, 0.5 mm pitch usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 74 smsc usb251x datasheet 11.1 tape and reel specifications figure 11.4 36-pin package tape specifications usb 2.0 hi-speed hub controller datasheet smsc usb251x 75 revision 1.1 (04-26-10) datasheet figure 11.5 48-pin package tape specifications usb 2.0 hi-speed hub controller datasheet revision 1.1 (04-26-10) 76 smsc usb251x datasheet figure 11.6 36-pin and 48-pin package reel specifications |
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