amd?s AM79C901 homepna-compliant device with motorola?s mc68360, mpc860, mpc850, and mpc8260 application note
publication# 22359 rev: c amendment/ 0 issue date: august 1999 amd ? s AM79C901 homepna-compliant device with motorola ? s mc68360, mpc860, mpc850, and mpc8260 application note the following application note describes how to interface amd?s AM79C901 homephy? 1/10 mbps home networking phy to the sccs, fecs, and fccs on motorola?s integrated commu- nication microprocessors. the user should make every effort to verify this design in the lab before releasing it. for more information or assistance, please contact the amd field applications engineer at your nearest amd sales office. supporting the home phoneline networking alliance (homepna) specification for data networking at speeds up to 1 mbps over existing residential phone wiring with a motorola quicc ? , powerquicc ? , and powerquicc ii ? integrated communication micropro- cessors is simple when you use amd ? s AM79C901 homephy device. all of the motorola integrated communication con- trollers that support ethernet or fast ethernet re- quire a separate phy (transceiver). amd ? s homephy device is a homepna-compliant phy that connects easily and without any glue logic to all of the ethernet and fast ethernet ports on the motorola communication microprocessors. amd ? s homephy device and all of the ethernet- enabled serial communication controllers (sccs) of the quicc/powerquicc/powerquicc ii, the fast ethernet controllers (fecs) of the mpc860t/dt, and the fast communication controllers (fccs) of the powerquicc ii support the 7-wire, sia interface (also called serial mode or general purpose serial interface (gpsi) mode). the remainder of this application note describes how to connect the 7-wire, sia interface of the homephy de- vice with motorola ? s ethernet-enabled sccs, fecs, and fccs. because every scc has different pin names, the ac- tual scc pin names in figure 1 have been omitted. please refer to table 1 for proper corresponding scc pin names. the interface between the scc and the homephy transceiver has seven pins. below is a description of these pins and their respective connections: 1. receive clock ? receive clock (rxclk) comes from the homephy device and goes into the scc (rclk) and may either be the clk1, clk2, clk3, clk4, clk5, clk6, clk7, or clk8 pin on the scc. table 1. homephy pin connections to various scc pins note: clka = clk1, clk2, clk3 or clk4 clkb = clk5, clk6, clk7 or clk8 2. transmit clock ? transmit clock (txclk) comes from the homephy device and goes into the scc (tclk) and may either be the clk, clk1, clk2, clk3, clk4, clk5, clk6, clk7, or clk8 pin on the scc. however, tclk and rclk cannot be con- nected to the same clk because the ethernet trans- ceiver supplies a separate clock signal between the transmitter and receiver. 3. receive data ? rxdat of the homephy trans- ceiver connects directly to the rxdat pin of the scc. 4. transmit data ? txdat of the homephy transceiver connects directly to the txd pin of the scc. 5. transmit enable ? the scc ? s rts changes to tena when it is configured to ethernet mode. tena connects to the homephy device ? s txen pin. this signal allows the scc to signal the homephy device when there is valid data on txd. 6. receive enable ? the scc ? s cd changes to rena when it is configured to ethernet mode. rena con- nects to the homephy device ? s crs pin. this signal allows the homephy device to signal the scc when AM79C901 pins scc pins scc1 scc2 scc3 scc4 txdat txd1 txd2 txd3 txd4 txen rts1 rts2 rts3 rts4 txclk clka clka clkb clkb rxdat rxd1 rxd2 rxd3 rxd4 rxcrs cd1 cd2 cd3 cd4 rxclk clka clka clkb clkb cls cts1 cts2 cts3 cts4
2 data has been received. 7. collision ? the scc ? s cts changes to clsn when it is configured to ethernet mode. clsn connects to the homephy device ? s cls pin. this signal indicates the detection of a collision condition. figure 1. 7-wire interface between scc and homephy devices note: this application note is based on engineering information from amd ? s and motorola ? s data sheets. limited validation has been done to test this specific application. refer to the amd homephy data sheet (pid#22304), the motorola quicc/powerquicc/powerquicc ii data sheets, and the motorola mpc860t fast ethernet controller supplement for additional information. the contents of this document are provided in connection with advanced micro devices, inc. ("amd") products. amd makes no repre sentations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make c hanges to speci- fications and product descriptions at any time without notice. no license, whether express, implied, arising by estoppel or oth erwise, to any in- tellectual property rights is granted by this publication. except as set forth in amd ? s standard terms and conditions of sale, amd assumes no liability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, th e implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. amd ? s products are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant i nto the body, or in other applications intended to support or sustain life, or in any other application in which the failure of amd ? s product could create a situation where personal injury, death, or severe property or environmental damage may occur. amd reserves the right to discont inue or make changes to its products at any time without notice. trademarks copyright ? 1999 advanced micro devices, inc. all rights reserved. amd, the amd logo, and combinations thereof are trademarks of advanced micro devices, inc. homephy is a trademark of advanced micro devices, inc. quicc, powerquicc, and powerquicc ii are trademarks of motorola, inc. product names used in this publication are for identification purposes only and may be trademarks of their respective companies . txdx rtsx clkx rxdx cdx clkx ctsx spiclk spimosi spimiso gpio pin motorola scc motorola spi AM79C901 homephy vcc txdat txd[2] txen txclk rxdat rxcrs rxclk cls rx_dv rx_er rxd[3:1] sclk sdi sdo csn mii/gpsi gm_mode phy_sel phy_ad isolate 10 k 22359c-1 vcc 10 k nc nc nc note: nc = no connect
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