View MT48H16M16LF_4615994.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Features
Mobile SDRAM
MT48H16M16LF - 4 Meg x 16 x 4 banks MT48H8M32LF - 2 Meg x 32 x 4 banks
Features
* Fully synchronous; all signals registered on positive edge of system clock * VDD/VDDQ = 1.70-1.95V * Internal, pipelined operation; column address can be changed every clock cycle * Four internal banks for concurrent operation * Programmable burst lengths: 1, 2, 4, 8, or continuous page1 * Auto precharge, includes concurrent auto precharge * Auto refresh and self refresh modes * LVTTL-compatible inputs and outputs * On-chip temperature sensor to control refresh rate * Partial-array self refresh (PASR) * Deep power-down (DPD) * Selectable output drive (DS) * 64ms refresh period (8,192 rows)
Table 1:
Addressing
16 Meg x 16 4 Meg x 16 x 4 banks 8K 8K (A0-A12) 4 (BA0, BA1) 512 (A0-A8) 8 Meg x 32 2 Meg x 32 x 4 banks 8K 4K (A0-A11) 4 (BA0, BA1) 512 (A0-A8)
Configuration Refresh count Row addressing Bank addressing Column addressing
Table 2:
Key Timing Parameters
CL = CAS (READ) latency Clock Rate (MHz)
Access Time Data Speed Setup Grade CL = 2 CL = 3 CL = 2 CL = 3 Time -75 -8 104 100 133 125 8ns 9ns 6ns 7ns 1.5ns 2.5ns
Data Hold Time 1ns 1ns
Options
* VDD/VDDQ - 1.8V/1.8V * Configuration - 16 Meg x 16 (4 Meg x 16 x 4 banks) - 8 Meg x 32 (2 Meg x 32 x 4 banks) * Plastic "green" package - 54-ball VFBGA (8mm x 9mm) - 90-ball VFBGA (8mm x 13mm) * Timing - cycle time - 7.5ns at CL = 3 - 8ns at CL = 3 * Power - Standard IDD2P/IDD7 - Low IDD2P/IDD7 * Operating temperature range - Commercial (0 to +70C) - Industrial (-40C to +85C) * Design revision
Marking
H 16M16 8M32 BF B5 -75 -8 None L None IT :G
Notes: 1. For continuous page burst, contact factory for availability.
PDF:09005aef8219eeeb/Source: 09005aef8219eedd MT48H16M16LF__1.fm - Rev F 4/07 EN
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
Products and specifications discussed herein are subject to change by Micron without notice.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Table of Contents Table of Contents
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Functional Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Ball Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 Ball Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Register Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Mode Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Burst Length (BL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Burst Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 CAS Latency (CL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Operating Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Write Burst Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Extended Mode Register (EMR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Temperature-Compensated Self Refresh (TCSR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 Driver Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 COMMAND INHIBIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 NO OPERATION (NOP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 LOAD MODE REGISTER (LMR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 ACTIVE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 READ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 WRITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 PRECHARGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 BURST TERMINATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 AUTO REFRESH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 SELF REFRESH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 Auto Precharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 Deep Power-Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 Bank/Row Activation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 READs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 WRITEs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 PRECHARGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 Power-Down. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 Deep Power-Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 Clock Suspend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 Burst Read/Single Write. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 Concurrent Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 READ with Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 WRITE with Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 Truth Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51 Timing Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
PDF:09005aef8219eeeb/Source: 09005aef8219eedd MT48H16M16LFTOC.fm - Rev F 4/07 EN
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM List of Figures List of Figures
Figure 1: Figure 2: Figure 3: Figure 4: Figure 5: Figure 6: Figure 7: Figure 8: Figure 9: Figure 10: Figure 11: Figure 12: Figure 13: Figure 14: Figure 15: Figure 16: Figure 17: Figure 18: Figure 19: Figure 20: Figure 21: Figure 22: Figure 23: Figure 24: Figure 25: Figure 26: Figure 27: Figure 28: Figure 29: Figure 30: Figure 31: Figure 32: Figure 33: Figure 34: Figure 35: Figure 36: Figure 37: Figure 38: Figure 39: Figure 40: Figure 41: Figure 42: Figure 43: Figure 44: Figure 45: Figure 46: Figure 47: Figure 48: Figure 49: Figure 50: Figure 51: Figure 52: 256Mb Mobile SDRAM Part Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 16 Meg x 16 SDRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 8 Meg x 32 SDRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 54-Ball FBGA (Top View) - 8mm x 9mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 90-Ball VFBGA (Top View) - 8mm x 13mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Mode Register Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 CAS Latency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 EMR Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 Activating a Specific Row in a Specific Bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 Example: Meeting tRCD (MIN) When 2 < tRCD (MIN)/tCK < 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 READ Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 Consecutive READ Bursts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 Random READ Accesses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 READ-to-WRITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 READ-to-WRITE with Extra Clock Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 READ-to-PRECHARGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 Terminating a READ Burst . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 WRITE Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 WRITE Burst . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 WRITE-to-WRITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 Random WRITE Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 WRITE-to-READ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 WRITE-to-PRECHARGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 Terminating a WRITE Burst . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 PRECHARGE Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 Power-Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 Clock Suspend During WRITE Burst . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 Clock Suspend During READ Burst . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 READ with Auto Precharge Interrupted by a READ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 READ with Auto Precharge Interrupted by a WRITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 WRITE with Auto Precharge Interrupted by a READ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39 WRITE with Auto Precharge Interrupted by a WRITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39 Typical Self Refresh Current vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49 Initialize and Load Mode Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54 Clock Suspend Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55 Auto Refresh Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56 Self Refresh Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57 READ - without Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58 READ - with Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59 Single READ - without Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60 Single READ - with Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61 Alternating Bank Read Accesses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62 READ - DQM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63 WRITE - without Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64 WRITE - with Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65 Single WRITE - without Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66 Single WRITE - with Auto Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67 Alternating Bank Write Accesses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68 WRITE - DQM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69 54-Ball VFBGA (8mm x 9mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 90-Ball VFBGA (8mm x 13mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM List of Tables List of Tables
Table 1: Table 2: Table 3: Table 4: Table 5: Table 6: Table 7: Table 8: Table 9: Table 10: Table 11: Table 12: Table 13: Table 14: Table 15: Table 16: Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Key Timing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 VFBGA Ball Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Burst Definition Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Truth Table - Commands and DQM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Truth Table - CKE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 Truth Table - Current State Bank n, Command to Bank n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 Truth Table - Current State Bank n, Command to Bank m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 DC Electrical Characteristics and Operating Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 Electrical Characteristics and Recommended AC Operating Conditions . . . . . . . . . . . . . . . . . . . . . . .46 AC Functional Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47 IDD Specifications and Conditions (x16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47 IDD Specifications and Conditions (x32) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 IDD7 - Self Refresh Current Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49 Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM General Description
Figure 1: 256Mb Mobile SDRAM Part Numbering
Power Example Part Number: MT48H8M32LFB5-75LIT
MT48
VDD/ VDDQ
Mobile Configuration
Package
-
Speed
Temp. Revision
Revision VDD/VDDQ 1.8V/1.8V H Operating Temp. Commercial IT Configuration 16 Meg x 16 8 Meg x 32 16M16LF 8M32LF L Package BF B5 8 x 9 VFBGA (lead-free) 8 x 13 VFBGA (lead-free) -75 -8 Power Standard IDD2P/IDD7 Low IDD2P/IDD7 Industrial :G Design Revision
Speed Grade
tCK tCK
= 7.5ns = 8.0ns
General Description
The Micron(R) 256Mb Mobile SDRAM is a high-speed CMOS, dynamic random-access memory containing 268,435,456-bits. It is internally configured as a quad-bank DRAM with a synchronous interface (all signals are registered on the positive edge of the clock signal, CLK). Each of the x16's 67,108,864-bit banks is organized as 8,192 rows by 512 columns by 16 bits. Each of the x32's 67,108,864-bit banks is organized as 4,096 rows by 512 columns by 32 bits. Read and write accesses to the SDRAM are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. Accesses begin with the registration of an ACTIVE command, which is then followed by a READ or WRITE command. The address bits registered coincident with the ACTIVE command are used to select the bank and row to be accessed. The address bits registered coincident with the READ or WRITE command are used to select the starting column location for the burst access. The SDRAM provides for programmable read or write burst lengths (BLs) of 1, 2, 4, or 8 page locations with a read burst terminate option. An auto precharge function may be enabled to provide a self-timed row precharge that is initiated at the end of the burst sequence. The 256Mb SDRAM uses an internal pipelined architecture to achieve high-speed operation. It also allows the column address to be changed on every clock cycle to achieve a high-speed, fully random access. Precharging one bank while accessing one of the other three banks will hide the precharge cycles and provide seamless high-speed, randomaccess operation.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Functional Block Diagrams
The 256Mb SDRAM is designed to operate in 1.8V low-power memory systems. An auto refresh mode is provided, along with a power-saving deep power-down mode. All inputs and outputs are LVTTL-compatible. SDRAM offers substantial advances in DRAM operating performance, including the ability to synchronously burst data at a high data rate with automatic column-address generation, the ability to interleave between internal banks in order to hide precharge time, and the capability to randomly change column addresses on each clock cycle during a burst access.
Functional Block Diagrams
Figure 2: 16 Meg x 16 SDRAM
CKE CLK CS# WE# CAS# RAS# CONTROL LOGIC
BA1 0 0 1 1
BA0 0 1 0 1
Bank 0 1 2 3
COMMAND DECODE
Bank3 Bank2 Bank1
EXT MODE REGISTER MODE REGISTER REFRESH 13 COUNTER ROWADDRESS MUX BANK0 ROWADDRESS 8,192 LATCH & DECODER
13
15 13
BANK0 MEMORY ARRAY (8,192 x 512 x 16)
2
2
UDQM, LDQM
Sense amplifiers
16
8,192
DATA OUTPUT REGISTER
2
A0-A12, BA0, BA1
15
ADDRESS REGISTER
2
BANK CONTROL LOGIC
I/O GATING DQM MASK LOGIC READ DATA LATCH WRITE DRIVERS 256 (x16) 16
16
DQ0- DQ15
DATA INPUT REGISTER
COLUMN DECODER COLUMNADDRESS COUNTER/ LATCH
9
9
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Functional Block Diagrams
Figure 3: 8 Meg x 32 SDRAM
CKE CLK CS# WE# CAS# RAS# CONTROL LOGIC
BA1 0 0 1 1
BA0 0 1 0 1
Bank 0 1 2 3
COMMAND DECODE
BANK3 BANK2 BANK1
EXT MODE REGISTER MODE REGISTER REFRESH 13 COUNTER BANK0 ROWADDRESS 4,096 LATCH & DECODER
14 12
ROWADDRESS MUX
12
BANK0 MEMORY ARRAY (4,096 x 512 x 32)
4
4
DQM0DQM3
SENSE AMPLIFIERS
32
4,096
DATA OUTPUT REGISTER
2
A0-A11, BA0, BA1
14
ADDRESS REGISTER
2
BANK CONTROL LOGIC
I/O GATING DQM MASK LOGIC READ DATA LATCH WRITE DRIVERS
32
32
DQ0- DQ31
512 (x32)
DATA INPUT REGISTER
COLUMN DECODER COLUMNADDRESS COUNTER/ LATCH
9
9
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Ball Assignments
Ball Assignments
Figure 4: 54-Ball FBGA (Top View) - 8mm x 9mm
1 A
VSS
2
3
4
5
6
7
8
9
DQ15 VSSQ
VDDQ
DQ0
VDD
B
DQ14 DQ13 VDDQ VSSQ DQ2 DQ1
C
DQ12 DQ11 VSSQ VDDQ DQ4 DQ3
D
DQ10 DQ9 VDDQ VSSQ DQ6 DQ5
E
DQ8 DNU VSS VDD LDQM DQ7
F
UDQM CLK CKE CAS# RAS# WE#
G
A12 A11 A9 BA0 BA1 CS#
H
A8 A7 A6 A0 A1 A10
J
VSS A5 A4 A3 A2 VDD
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Ball Assignments
Figure 5: 90-Ball VFBGA (Top View) - 8mm x 13mm
1 A
DQ26
2
3
4
5
6
7
8
9
DQ24
VSS
VDD
DQ23
DQ21
B
DQ28 VDDQ VSSQ VDDQ VSSQ DQ19
C
VSSQ DQ27 DQ25 DQ22 DQ20 VDDQ
D
VSSQ DQ29 DQ30 DQ17 DQ18 VDDQ
E
VDDQ DQ31 NC NC DQ16 VSSQ
F
VSS DQM3 A3 A2 DQM2 VDD
G
A4 A5 A6 A10 A0 A1
H
A7 A8 NC NC BA1 A11
J
CLK CKE A9 BA0 CS# RAS#
K
DQM1
DNU
DQ8
NC
CAS#
WE#
DQM0
L
VDDQ VSS VDD DQ7 VSSQ
M
VSSQ DQ10 DQ9 DQ6 DQ5 VDDQ
N
VSSQ DQ12 DQ14 DQ1 DQ3 VDDQ
P
DQ11 VDDQ VSSQ VDDQ VSSQ DQ4
R
DQ13 DQ15 VSS VDD DQ0 DQ2
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Ball Descriptions
Ball Descriptions
Table 3: VFBGA Ball Descriptions
Symbol CLK Type Input Description Clock: CLK is driven by the system clock. All SDRAM input signals are sampled on the positive edge of CLK. CLK also increments the internal burst counter and controls the output registers. Clock enable: CKE activates (HIGH) and deactivates (LOW) the CLK signal. Deactivating the clock provides precharge powerdown and SELF REFRESH operation (all banks idle), ACTIVE power-down (row active in any bank), Deep power-down (all banks idle), or CLOCK SUSPEND operation (burst/access in progress). CKE is synchronous except after the device enters power-down and self refresh modes, where CKE becomes asynchronous until after exiting the same mode. The input buffers, including CLK, are disabled during power-down and self refresh modes, providing low standby power. Chip select: CS# enables (registered LOW) and disables (registered HIGH) the command decoder. All commands are masked when CS# is registered HIGH. CS# provides for external bank selection on systems with multiple banks. CS# is considered part of the command code. Command inputs: RAS#, CAS#, and WE# (along with CS#) define the command being entered. Input/output mask: DQM is sampled HIGH and is an input mask signal for write accesses and an output enable signal for read accesses. Input data is masked during a WRITE cycle. The output buffers are placed in a High-Z state (two-clock latency) during a READ cycle. For the x16, LDQM corresponds to DQ0-DQ7 and UDQM corresponds to DQ8-DQ16. For the x32, DQM0 corresponds to DQ0-DQ7, DQM1 corresponds to DQ8-DQ15, DQM2 corresponds to DQ16-DQ23, and DQM3 corresponds to DQ24-DQ31. DQM0-DQM3 (or LDQM and UDQM if x16) are considered same state when referenced as DQM. DQM loading is designed to match that of DQ balls. Bank address input(s): BA0 and BA1 define to which bank the ACTIVE, READ, WRITE, or PRECHARGE command is being applied. These balls also provide the op-code during a LOAD MODE REGISTER (LMR) command. BA0 and BA1 become "Don't Care" when registering an ALL BANK PRECHARGE (A10 HIGH). Address inputs: A0-A12 are sampled during the ACTIVE command (row-address A0-A12) and READ/WRITE command (column-address A0-A8 [x32]; column-address A0-A8 [x16]; with A10 defining auto precharge) to select one location out of the memory array in the respective bank. A10 is sampled during a PRECHARGE command to determine if all banks are to be precharged (A10 HIGH) or bank selected by BA0, BA1. The address inputs also provide the op-code during a LMR command.
54-Ball VFBGA 90-Ball VFBGA F2 J1
F3
J2
CKE
Input
G9
J8
CS#
Input
F7, F8, F9 F1, E8
K7, J9, K8 K9, K1, F8, F2
CAS#, RAS#, WE# UDQM LDQM, DQM0- DQM3
Input Input
G7, G8
J7, H8
BA0, BA1
Input
H7, H8, J8, J7, J3, J2, H3, H2, H1, G3, H9, G2, G1
G8, G9, F7, F3, G1, G2, G3, H1, H2, J3, G7, H9
A0-A12
Input
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Ball Descriptions
Table 3: VFBGA Ball Descriptions (Continued)
Symbol Type I/O Description Data input/output: Data bus.
54-Ball VFBGA 90-Ball VFBGA A8, B9, B8, C9, C8, D9, D8, E9, E1, D2, D1, C2, C1, B2, B1, A2
A7, B3, C7, D3
A3, B7, C3, D7
A9, E7, J9 A1, E3, J1 - E2
R8, N7, R9, N8, DQ0-DQ31 P9, M8, M7, L8, L2, M3, M2, P1, N2, R1, N3, R2, E8, D7, D8, B9, C8, A9, C7, A8, A2, C3, A1, C2, B1, D2, D3, E2 B2, B7, C9, D9, VDDQ E1, L1, M9, N9, P2, P7 B8, B3, C1, D1, VSSQ E9, L9, M1, N1, P3, P8 A7, F9, L7, R7 VDD A3, F1, L3, R3 VSS E3, E7, H3, H7, NC K3 K2 DNU
Supply
DQ power: Provide isolated power to DQ for improved noise immunity. DQ ground: Provide isolated ground to DQ for improved noise immunity. Core power supply. Ground. Internally not connected: These could be left unconnected, but it is recommended they be connected to Vss. E2 is a TEST pin that must be tied to VSS or VssQ in normal operation.
Supply
Supply Supply - Input
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Functional Description
Functional Description
In general, a 256Mb SDRAM is quad-bank DRAM that operates at 1.8V and includes a synchronous interface (all signals are registered on the positive edge of the clock signal, CLK). Read and write accesses to the SDRAM are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. Accesses begin with the registration of an ACTIVE command, which is then followed by a READ or WRITE command. The address bits registered coincident with the ACTIVE command are used to select the bank and row to be accessed (BA0 and BA1 select the bank, A0-A12 select the row for x16, and A0-A11 select the row for x32). The address bits (A0-A8 for x16 and A0-A8 for x32) registered coincident with the READ or WRITE command are used to select the starting column location for the burst access. Prior to normal operation, the SDRAM must be initialized. The following sections provide detailed information covering device initialization, register definition, command descriptions, and device operation.
Initialization
SDRAM must be powered up and initialized in a predefined manner. Operational procedures other than those specified may result in undefined operation. The initialization for mobile SDRAM is as follows. 1. Simultaneously apply power to VDD and VDDQ. 2. After power supplies have settled, apply a stable clock signal. Stable clock is defined as a signal cycling within timing constraints specified for the clock pin. 3. Wait at least 100s. During this period NOP or COMMAND INHIBIT commands should be applied. No other command other than NOP or COMMAND INHIBIT is allowed during this period. 4. Preform a PRECHARGE ALL command to place the SDRAM into an all banks idle state. 5. Wait at least tRP time. During this time NOP or COMMAND INHIBIT commands must be applied. 6. Issue an AUTO REFRESH command. 7. Wait at least tRFC time, during which only NOP or COMMAND INHIBIT commands are allowed. 8. Issue an Auto Refresh command. 9. Wait at least tRFC time, during which only NOP or COMMAND INHIBIT commands are allowed. 10. Issue a LOAD MODE REGISTER command with BA1=0, andBA0=0, to program the mode register with desired values. 11. Wait tMRD time. Only NOP or COMMAND INHIBIT commands may be applied during this time. 12. Issue a LOAD MODE REGISTER command with BA1=1, and BA0=0, to program the extended mode register with desired values. 13. Wait tMRD time. Only NOP or COMMAND INHIBIT commands may be applied during this time. The Mobile SDRAM is now initialized and can accept any valid command.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Register Definition
Register Definition
Mode Register
There are two MRs in the component: mode register and extended mode register (EMR). The mode register is illustrated in Figure 6 on page 14. The mode register is used to define the specific mode of operation of the SDRAM. This definition includes the selection of a burst length (BL), a burst type, a CAS latency (CL), an operating mode and a write burst mode, as shown in Figure 6 on page 14. The mode register is programmed via the LMR command and will retain the stored information until it is programmed again or the device loses power. M0-M2 mode register bits specify the BL, M3 specifies the type of burst, M4-M6 specify the CL, M7 and M8 specify the operating mode, M9 specifies the write burst mode, and M10 and M11 should be set to zero. The mode register must be loaded when all banks are idle, and the controller must wait t MRD before initiating the subsequent operation. Violating either of these requirements will result in unspecified operation. Burst Length (BL) Read and write accesses to the SDRAM are burst oriented, with the BL being programmable, as shown in Figure 6 on page 14. The BL determines the maximum number of column locations that can be accessed for a given READ or WRITE command. BL = 1, 2, 4, 8 locations are available for both the sequential and the interleaved burst types. Reserved states should not be used, as unknown operation or incompatibility with future versions may result. When a READ or WRITE command is issued, a block of columns equal to the BL is effectively selected. All accesses for that burst take place within this block, meaning that the burst will wrap within the block if a boundary is reached. The block is uniquely selected by A1-A8 when BL = 2, A2-A8 when BL = 4, and A3-A8 when BL = 8. The remaining (least significant) address bit(s) is (are) used to select the starting location within the block. Burst Type Accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as the burst type and is selected via bit M3. The ordering of accesses within a burst is determined by the BL, the burst type, and the starting column address, as shown in Table 4 on page 15.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Register Definition
Figure 6: Mode Register Definition
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Address Bus
M14 M13 M12 M11 M10 M9 M8 M7 M6 M5 M4 M3 M2 M1 M0 14 0 13 12 0 11 10 9 8 7 6 5 4 3 2 1 0 Reserved WB OP Mode CAS Latency BT Burst Length Mode Register (Mx)
Program M12, M11, M10 = "0, 0, 0" to ensure compatibility with future devices.
Burst Length M2 M1 M0 0 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 M3 = 0 1 2 4 8 Reserved Reserved Reserved Reserved M3 = 1 1 2 4 8 Reserved Reserved Reserved Reserved
M14 M13 Mode Register Definintion 0 0 Base mode register 0 1 1 1 0 1 Reserved Extended mode register Reserved M9 0 1 Write Burst Mode Programmed burst length Single location access
0 0 0 1 1 1 1
M3 M8 M7 M6-M0 Operating Mode Valid Normal operation 0 0 - - - All other states reserved M6 M5 M4 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 CAS Latency Reserved Reserved 2 3 Reserved Reserved Reserved Reserved 0 1
Burst Type Sequential Interleaved
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Register Definition
Table 4: Burst Definition Table
Order of Accesses Within a Burst Burst Length Starting Column Address 2 A0 0 1 A0 0 1 0 1 A0 0 1 0 1 0 1 0 1 Type = Sequential 0-1 1-0 0-1-2-3 1-2-3-0 2-3-0-1 3-0-1-2 0-1-2-3-4-5-6-7 1-2-3-4-5-6-7-0 2-3-4-5-6-7-0-1 3-4-5-6-7-0-1-2 4-5-6-7-0-1-2-3 5-6-7-0-1-2-3-4 6-7-0-1-2-3-4-5 7-0-1-2-3-4-5-6 Type = Interleaved 0-1 1-0 0-1-2-3 1-0-3-2 2-3-0-1 3-2-1-0 0-1-2-3-4-5-6-7 1-0-3-2-5-4-7-6 2-3-0-1-6-7-4-5 3-2-1-0-7-6-5-4 4-5-6-7-0-1-2-3 5-4-7-6-1-0-3-2 6-7-4-5-2-3-0-1 7-6-5-4-3-2-1-0
4
8
A2 0 0 0 0 1 1 1 1
A1 0 0 1 1 A1 0 0 1 1 0 0 1 1
CAS Latency (CL) The CL is the delay, in clock cycles, between the registration of a READ command and the availability of the first piece of output data. The latency can be set to two or three clocks. If a READ command is registered at clock edge n, and the latency is m clocks, the data will be available by clock edge n + m. The DQs will start driving as a result of the clock edge one cycle earlier (n + m - 1), and provided that the relevant access times are met, the data will be valid by clock edge n + m. For example, assuming that the clock cycle time is such that all relevant access times are met, if a READ command is registered at T0 and the latency is programmed to two clocks, the DQs will start driving after T1 and the data will be valid by T2, as shown in Figure 7 on page 16. Reserved states should not be used as unknown operation or incompatibility with future versions may result.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Register Definition
Figure 7: CAS Latency
T0 CLK COMMAND T1 T2 T3
READ
NOP tLZ
NOP tOH DOUT
DQ tAC CL = 2
T0 CLK COMMAND
T1
T2
T3
T4
READ
NOP
NOP tLZ
NOP tOH DOUT
DQ tAC CL = 3
DON'T CARE UNDEFINED
Operating Mode The normal operating mode is selected by setting M7 and M8 to zero; the other combinations of values for M7 and M8 are reserved for future use. Reserved states should not be used as unknown operation or incompatibility with future versions may result. Write Burst Mode When M9 = 0, the BL programmed via M0-M2 applies to both READ and WRITE bursts; when M9 = 1, the programmed BL applies to READ bursts, but write accesses are singlelocation accesses.
Extended Mode Register (EMR)
The low-power EMR controls the functions beyond those controlled by the MR. These additional functions are special features of the mobile device. They include temperature-compensated self refresh (TCSR) control, partial-array self refresh (PASR), and output drive strength. The low-power EMR is programmed via the MODE REGISTER SET command and retains the stored information until it is programmed again or the device loses power.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Register Definition
Figure 8: EMR Definition
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Address Bus
E14 E13 E12 E11 E10 E9 14 1 13 12 0 9 11 10 set to "0"
E8 8
E7 7
E6
E5
E4
E3
E2 2
E1
E0 Extended Mode Register
65 DS
4 3 TCSR1
0 1 PASR
E14 E13 Mode Register Definintion 0 Standard mode register 0 1 Reserved 0 0 Extended mode register 1 1 Reserved 1
E6 0 0 1 1
E5 0 1 0 1
Driver Strength Full strength driver Half strength driver Quarter strength driver Eighth strength driver
E2 0 0 0 0 1 1 1 1 E1 0 0 1 1 0 0 1 1 E0 0 1 0 1 0 1 0 1 Partial Array Self Refresh Coverage Full array Half array Quarter array Reserved Reserved One-eighth array One-sixteenth array Reserved
E12 E11 E10 E9 0 0 0 0 - - - -
E8 0 -
E7 0 -
E6-E0 Valid -
Normal operation All other states reserved
Notes:
1. On-die temperature sensor is used in place of TCSR. Setting these bits will have no effect.
The EMR must be loaded when all banks are idle and no bursts are in progress, and the controller must wait the specified time before initiating any subsequent operation. Violating either of these requirements results in unspecified operation. Once the values are entered, the EMR settings will be retained even after exiting deep power-down mode. Temperature-Compensated Self Refresh (TCSR) On this version of the Mobile SDR SDRAM, a temperature sensor is implemented for automatic control of the self refresh oscillator on the device. Therefore, it is recommended not to program or use the temperature-compensated self refresh control bits in the extended mode register. Programming of the TCSR bits has no effect on the device. The self refresh oscillator will continue refresh at the factory programmed optimal rate for the device temperature.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Register Definition
Partial-Array Self Refresh (PASR) For further power savings during self refresh, the partial-array self refresh (PASR) feature allows the controller to select the amount of memory that will be refreshed during self refresh. The following refresh options are available. 1. All banks (banks 0, 1, 2, and 3). 2. Two banks (banks 0 and 1; BA1=0). 3. One bank (bank 0; BA1 = BA0 = 0). 4. Half bank (bank 0; BA1 = BA0 = row address MSB = 0). 5. Quarter bank (bank 0; BA1 = BA0; row address MSB = row address MSB -1 = 0). WRITE and READ commands occur to any bank selected during standard operation, but only the selected banks in PASR will be refreshed during self refresh. It is important to note that data in banks 2 and 3 will be lost when the two-bank option is used. Driver Strength Bits E5 and E6 of the EMR can be used to select the driver strength of the DQ outputs. This value should be set according to the application's requirements.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Commands
Commands
Table 5 provides a quick reference of available commands. This is followed by a written description of each command. Three additional Truth Tables appear following "Operations" on page 23. These tables provide current state/next state information. Table 5: Truth Table - Commands and DQM Operation
Notes 1 and 2 apply to all commands Name (Function) COMMAND INHIBIT (NOP) NO OPERATION (NOP) ACTIVE (Select bank and activate row) READ (Select bank and column, and start READ burst) WRITE (Select bank and column, and start WRITE burst) BURST TERMINATE or deep power-down (Enter deep power-down mode) PRECHARGE (Deactivate row in bank or banks) AUTO REFRESH or SELF REFRESH (Enter self refresh mode) LOAD MODE REGISTER Write enable/output enable Write inhibit/output High-Z Notes: CS# H L L L L L L L L X X RAS# CAS# X H L H H H L L L X X X H H L L H H L L X X WE# X H H H L L L H L X X DQM X X X L/H L/H X X X X L H ADDR X X Bank/Row Bank/Col Bank/Col X Code X Op-Code X X DQs X X X X Valid X X X X Active High-Z Notes 4 4 5 6 6 3, 7, 8 9 10, 11 12
1. CKE is HIGH for all commands shown except SELF REFRESH and deep power-down. 2. All states and sequences not shown are reserved and/or illegal. 3. The purpose of the BURST TERMINATE command is to stop a data burst, thus the command could coincide with data on the bus. However, the DQs column reads a don't care state to illustrate that the BURST TERMINATE command can occur when there is no data present. 4. DESELECT and NOP are functionally interchangeable. 5. BA0-BA1 provide bank address and A0-A12 provide row address. 6. BA0-BA1 provide bank address; A0-A9 provide column address; A10 HIGH enables the auto precharge feature (nonpersistent), and A10 LOW disables the auto precharge feature. 7. Applies only to read bursts with auto precharge disabled; this command is undefined (and should not be used) for READ bursts with auto precharge enabled and for WRITE bursts. 8. This command is a BURST TERMINATE if CKE is HIGH, deep power-down if CKE is LOW. 9. A10 LOW: BA0-BA1 determine which bank is precharged. A10 HIGH: all banks are precharged and BA0-BA1 are "Don't Care." 10. This command is AUTO REFRESH if CKE is HIGH, SELF REFRESH if CKE is LOW. 11. Internal refresh counter controls row addressing; all inputs and I/Os are "Don't Care" except for CKE. 12. BA0-BA1 select either the standard mode register or the extended mode register (BA0 = 0, BA1 = 0 select the standard mode register; BA0 = 0, BA1 = 1 select extended mode register; other combinations of BA0-BA1 are reserved.) A0-A12 provide the op-code to be written to the selected mode register.
COMMAND INHIBIT The COMMAND INHIBIT function prevents new commands from being executed by the SDRAM, regardless of whether the CLK signal is enabled. The SDRAM is effectively deselected. Operations already in progress are not affected.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Commands
NO OPERATION (NOP) The NO OPERATION (NOP) command is used to perform a NOP to an SDRAM which is selected (CS# is LOW). This prevents unwanted commands from being registered during idle or wait states. Operations already in progress are not affected. LOAD MODE REGISTER (LMR) The MR is loaded via inputs A0-A12, BA0, and BA1. (See "Mode Register" on page 13.) The LMR and LOAD EXTENDED MODE REGISTER (LEMR) commands can only be issued when all banks are idle, and a subsequent executable command cannot be issued until tMRD is met. ACTIVE The ACTIVE command is used to open (or activate) a row in a particular bank for a subsequent access. The value on the BA0, BA1 inputs selects the bank, and the address provided selects the row. This row remains active (or open) for accesses until a PRECHARGE command is issued to that bank. A PRECHARGE command must be issued before opening a different row in the same bank. READ The READ command is used to initiate a burst read access to an active row. The value on the BA0, BA1 inputs selects the bank, and the address provided selects the starting column location. The value on input A10 determines whether or not auto precharge is used. If auto precharge is selected, the row being accessed will be precharged at the end of the read burst; if auto precharge is not selected, the row will remain open for subsequent accesses. Read data appears on the DQs subject to the logic level on the DQM inputs two clocks earlier. If a given DQM signal was registered HIGH, the corresponding DQs will be High-Z two clocks later; if the DQM signal was registered LOW, the DQs will provide valid data. WRITE The WRITE command is used to initiate a burst write access to an active row. The value on the BA0, BA1 inputs selects the bank, and the address provides the starting column location. The value on input A10 determines whether or not auto precharge is used. If auto precharge is selected, the row being accessed will be precharged at the end of the write burst; if auto precharge is not selected, the row will remain open for subsequent accesses. Input data appearing on the DQs is written to the memory array subject to the DQM input logic level appearing coincident with the data. If a given DQM signal is registered LOW, the corresponding data will be written to memory; if the DQM signal is registered HIGH, the corresponding data inputs will be ignored, and a write will not be executed to that byte/column location. PRECHARGE The PRECHARGE command is used to deactivate the open row in a particular bank or the open row in all banks. The bank(s) will be available for a subsequent row access a specified time (tRP) after the precharge command is issued. Input A10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs BA0, BA1 select the bank. Otherwise BA0, BA1 are treated as "Don't Care." Once a bank has been precharged, it is in the idle state and must be activated prior to any READ or WRITE commands being issued to that bank.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Commands
BURST TERMINATE The BURST TERMINATE command is used to truncate fixed-length bursts. The most recently registered READ or WRITE command prior to the BURST TERMINATE command will be truncated, as shown in "Operations" on page 23. AUTO REFRESH AUTO REFRESH is used during normal operation of the SDRAM and is analogous to CAS#-BEFORE-RAS# (CBR) refresh in conventional DRAM. This command is non persistent, so it must be issued each time a refresh is required. All active banks must be PRECHARGED prior to issuing an AUTO REFRESH command. The AUTO REFRESH command should not be issued until the minimum tRP has been met after the PRECHARGE command, as shown in "Operations" on page 23. The addressing is generated by the internal refresh controller. This makes the address bits "Don't Care" during an AUTO REFRESH command. The 256Mb SDRAM requires 8,192 AUTO REFRESH cycles every 64ms (tREF). Providing a distributed AUTO REFRESH command every 7.8125s will meet the refresh requirement and ensure that each row is refreshed. Alternatively, 8,192 AUTO REFRESH commands can be issued in a burst at the minimum cycle rate (tRFC), once every 64ms. SELF REFRESH The SELF REFRESH command can be used to retain data in the SDRAM, even if the rest of the system is powered down. When in the self refresh mode, the SDRAM retains data without external clocking. The SELF REFRESH command is initiated like an AUTO REFRESH command, except CKE is disabled (LOW). Once the SELF REFRESH command is registered, all the inputs to the SDRAM become "Don't Care" with the exception of CKE, which must remain LOW. Once self refresh mode is engaged, the SDRAM provides its own internal clocking, causing it to perform its own auto refresh cycles. The SDRAM must remain in self refresh mode for a minimum period equal to tRAS and may remain in self refresh mode for an indefinite period beyond that. The procedure for exiting self refresh requires a sequence of commands. First, CLK must be stable (stable clock is defined as a signal cycling within timing constraints specified for the clock ball) prior to CKE going back HIGH. Once CKE is HIGH, the SDRAM must have NOP commands issued (a minimum of two clocks) for tXSR because time is required for the completion of any internal refresh in progress. Upon exiting the self refresh mode, AUTO REFRESH commands must be issued every 7.8125s or less as both SELF REFRESH and AUTO REFRESH utilize the row refresh counter. Auto Precharge Auto precharge is a feature which performs the same individual-bank precharge function described above, without requiring an explicit command. This is accomplished by using A10 to enable auto precharge in conjunction with a specific READ or WRITE command. A precharge of the bank/row that is addressed with the READ or WRITE command is automatically performed upon completion of the READ or WRITE burst. Auto precharge is non persistent in that it is either enabled or disabled for each individual READ or WRITE command.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Commands
Auto precharge ensures that the precharge is initiated at the earliest valid stage within a burst. The user must not issue another command to the same bank until the precharge time (tRP) is completed. This is determined as if an explicit PRECHARGE command was issued at the earliest possible time, as described for each burst type in "Operations" on page 23. Deep Power-Down Deep power-down is an operating mode used to achieve maximum power reduction by eliminating the power to the memory array. Data will not be retained once the device enters deep power-down mode.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Operations
Bank/Row Activation
Before any READ or WRITE commands can be issued to a bank within the SDRAM, a row in that bank must be "opened." This is accomplished via the ACTIVE command, which selects both the bank and the row to be activated (see Figure 9). After opening a row (issuing an ACTIVE command), a READ or WRITE command may be issued to that row, subject to the tRCD specification. tRCD (MIN) should be divided by the clock period and rounded up to the next whole number to determine the earliest clock edge after the ACTIVE command on which a READ or WRITE command can be entered. For example, a tRCD specification of 20ns with a 125 MHz clock (8ns period) results in 2.5 clocks, rounded to 3. This is reflected in Figure 10 on page 24, which covers any case where 2 < tRCD (MIN)/tCK 3. (The same procedure is used to convert other specification limits from time units to clock cycles.) A subsequent ACTIVE command to a different row in the same bank can only be issued after the previous active row has been "closed" (precharged). The minimum time interval between successive ACTIVE commands to the same bank is defined by tRC. A subsequent ACTIVE command to another bank can be issued while the first bank is being accessed, which results in a reduction of total row-access overhead. The minimum time interval between successive ACTIVE commands to different banks is defined by t RRD. Figure 9: Activating a Specific Row in a Specific Bank
CLK CKE CS# HIGH
RAS#
CAS#
WE#
A0-A11
ROW ADDRESS
BA0, BA1
BANK ADDRESS
DONT CARE
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Figure 10: Example: Meeting tRCD (MIN) When 2 < tRCD (MIN)/tCK < 3
T0 CLK tCK COMMAND ACTIVE NOP tRCD (MIN) tCK NOP tCK READ or WRITE T1 T2 T3
DON'T CARE
READs
READ bursts are initiated with a READ command, as shown in Figure 11. The starting column and bank addresses are provided with the READ command, and auto precharge is either enabled or disabled for that burst access. If auto precharge is enabled, the row being accessed is precharged at the completion of the burst. For the generic READ commands used in the following illustrations, auto precharge is disabled. During READ bursts, the valid data-out element from the starting column address will be available following the CL after the READ command. Each subsequent data-out element will be valid by the next positive clock edge. Figure 7 on page 16 shows general timing for each possible CL setting. Figure 11: READ Command
CLK CKE CS# HIGH
RAS#
CAS#
WE#
A0-A8
COLUMN ADDRESS
A9, A11
ENABLE AUTO PRECHARGE
A10
DISABLE AUTO PRECHARGE BANK ADDRESS
BA0, BA1
DON'T CARE
Upon completion of a burst, assuming no other commands have been initiated, the DQs will go High-Z.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Data from any READ burst may be truncated with a subsequent READ command, and data from a fixed-length READ burst may be immediately followed by data from a READ command. In either case, a continuous flow of data can be maintained. The first data element from the new burst follows either the last element of a completed burst or the last desired data element of a longer burst that is being truncated. The new READ command should be issued x cycles before the clock edge at which the last desired data element is valid, where x = CL - 1. Figure 7 on page 16 shows for CL of two and three; data element n + 3 is either the last of a burst of four or the last desired of a longer burst. The 256Mb SDRAM uses a pipelined architecture. A READ command can be initiated on any clock cycle following a previous READ command. Full-speed random read accesses can be performed to the same bank, as shown in Figure 12 on page 25, or each subsequent READ may be performed to a different bank. Figure 12: Consecutive READ Bursts
T0 CLK T1 T2 T3 T4 T5 T6
COMMAND
READ
NOP
NOP
NOP
READ
NOP
NOP
X = 1 cycle
ADDRESS
BANK, COL n
BANK, COL b
DQ
CL = 2
DOUT n
DOUT n+1
DOUT n+2
DOUT n+3
DOUT b
T0 CLK
T1
T2
T3
T4
T5
T6
T7
COMMAND
READ
NOP
NOP
NOP
READ
NOP
NOP
NOP
X = 2 cycles
ADDRESS
BANK, COL n
BANK, COL b
DQ
CL = 3
DOUT n
DOUT n+1
DOUT n+2
DOUT n+3
DOUT b
DON'T CARE
Note:
Each READ command may be to either bank. DQM is LOW.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Figure 13: Random READ Accesses
T0 CLK T1 T2 T3 T4 T5
COMMAND
READ
READ
READ
READ
NOP
NOP
ADDRESS
BANK, COL n
BANK, COL a
BANK, COL x
BANK, COL m
DQ
CL = 2
DOUT n
DOUT a
DOUT x
DOUT m
T0 CLK
T1
T2
T3
T4
T5
T6
COMMAND
READ
READ
READ
READ
NOP
NOP
NOP
ADDRESS
BANK, COL n
BANK, COL a
BANK, COL x
BANK, COL m
DQ
CL = 3
DOUT n
DOUT a
DOUT x
DOUT m
DON'T CARE
Note:
Each READ command may be to either bank. DQM is LOW.
Data from any READ burst may be truncated with a subsequent WRITE command, and data from a fixed-length READ burst may be immediately followed by data from a WRITE command (subject to bus turnaround limitations). The WRITE burst may be initiated on the clock edge immediately following the last (or last desired) data element from the READ burst, provided that I/O contention can be avoided. In a given system design, there may be a possibility that the device driving the input data will go Low-Z before the SDRAM DQs go High-Z. In this case, at least a single-cycle delay should occur between the last read data and the WRITE command. The DQM input is used to avoid I/O contention, as shown in Figure 14 on page 27 and Figure 15 on page 28. The DQM signal must be asserted (HIGH) at least two clocks prior to the WRITE command (DQM latency is two clocks for output buffers) to suppress dataout from the READ. Once the WRITE command is registered, the DQs will go High-Z (or remain High-Z), regardless of the state of the DQM signal, provided the DQM was active on the clock just prior to the WRITE command that truncated the READ command. If
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
not, the second WRITE will be an invalid WRITE. For example, if DQM was LOW during T4 (as in Figure 15 on page 28) then the WRITEs at T5 and T7 would be valid, while the WRITE at T6 would be invalid. The DQM signal must be de-asserted prior to the WRITE command (DQM latency is zero clocks for input buffers) to ensure that the written data is not masked. Figure 12 on page 25 shows the case where the clock frequency allows for bus contention to be avoided without adding a NOP cycle, and Figure 13 on page 26 shows the case where the additional NOP is needed. A fixed-length READ burst may be followed by, or truncated with, a PRECHARGE command to the same bank (provided that auto precharge was not activated). The PRECHARGE command should be issued x cycles before the clock edge at which the last desired data element is valid, where x = CL - 1. This is shown in Figure 16 on page 28 for each possible CL; data element n + 3 is either the last of a burst of four or the last desired of a longer burst. Following the PRECHARGE command, a subsequent command to the same bank cannot be issued until tRP is met. Note that part of the row precharge time is hidden during the access of the last data element(s). In the case of a fixed-length burst being executed to completion, a PRECHARGE command issued at the optimum time (as described above) provides the same operation that would result from the same fixed-length burst with auto precharge. The disadvantage of the PRECHARGE command is that it requires that the command and address buses be available at the appropriate time to issue the command; the advantage of the PRECHARGE command is that it can be used to truncate fixed-length page bursts. Figure 14: READ-to-WRITE
T0 CLK DQM T1 T2 T3 T4
COMMAND ADDRESS
READ
NOP
NOP
NOP
WRITE
BANK, COL n
BANK, COL b
tCK tHZ DQ
DOUT n DIN b
tDS DON'T CARE
Note:
CL = 3. The READ command may be to any bank, and the WRITE command may be to any bank. If a burst of one is used, then DQM is not required.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Figure 15: READ-to-WRITE with Extra Clock Cycle
T0 CLK DQM T1 T2 T3 T4 T5
COMMAND ADDRESS
READ
NOP
NOP
NOP
NOP
WRITE
BANK, COL n
BANK, COL b
tHZ DQ
DOUT n DIN b
tDS
DON'T CARE
Note:
CL = 3. The READ command may be to any bank, and the WRITE command may be to any bank.
Figure 16:
READ-to-PRECHARGE
T0 CLK
t RP
T1
T2
T3
T4
T5
T6
T7
COMMAND
READ
NOP
NOP
NOP
PRECHARGE X = 1 cycle
NOP
NOP
ACTIVE
ADDRESS
BANK a, COL n
BANK (a or all)
BANK a, ROW
DQ
CL = 2
DOUT n
DOUT n+1
DOUT n+2
DOUT n+3
T0 CLK
T1
T2
T3
T4
T5
T6
T7
t RP
COMMAND
READ
NOP
NOP
NOP
PRECHARGE
NOP X = 2 cycles
NOP
ACTIVE
ADDRESS
BANK a, COL n
BANK (a or all)
BANK a, ROW
DQ
CL = 3
DOUT n
DOUT n+1
DOUT n+2
DOUT n+3
DON'T CARE
Note:
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DQM is LOW.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Fixed-length READ bursts may be truncated with a BURST TERMINATE command, provided that auto precharge was not activated. The BURST TERMINATE command should be issued x cycles before the clock edge at which the last desired data element is valid, where x = CL - 1. This is shown in Figure 17 for each possible CL; data element n + 3 is the last desired data element of a longer burst. Figure 17: Terminating a READ Burst
T0 CLK T1 T2 T3 T4 T5 T6
COMMAND
READ
NOP
NOP
NOP
BURST TERMINATE X = 1 cycle
NOP
NOP
ADDRESS
BANK, COL n
DQ
CL = 2
DOUT n
DOUT n+1
DOUT n+2
DOUT n+3
T0 CLK
T1
T2
T3
T4
T5
T6
T7
COMMAND
READ
NOP
NOP
NOP
BURST TERMINATE
NOP
NOP
NOP
X = 2 cycles
ADDRESS
BANK, COL n
DQ
CL = 3
DOUT n
DOUT n+1
DOUT n+2
DOUT n+3
DON'T CARE
Note:
DQM is LOW.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations WRITEs
WRITE bursts are initiated with a WRITE command, as shown in Figure 18 on page 30. The starting column and bank addresses are provided with the WRITE command, and auto precharge is either enabled or disabled for that access. If auto precharge is enabled, the row being accessed is precharged at the completion of the burst. For the generic WRITE commands used in the following illustrations, auto precharge is disabled. During WRITE bursts, the first valid data-in element will be registered coincident with the WRITE command. Subsequent data elements will be registered on each successive positive clock edge. Upon completion of a fixed-length burst, assuming no other commands have been initiated, the DQs will remain High-Z and any additional input data will be ignored (see Figure 19). Figure 18: WRITE Command
CLK CKE HIGH CS#
RAS#
CAS#
WE#
A0-A8 A9, A11, A12
COLUMN ADDRESS
ENABLE AUTO PRECHARGE
A10
DISABLE AUTO PRECHARGE BANK ADDRESS
BA0, BA1
VALID ADDRESS
DON'T CARE
Data for any WRITE burst may be truncated with a subsequent WRITE command, and data for a fixed-length WRITE burst may be immediately followed by data for a WRITE command. The new WRITE command can be issued on any clock following the previous WRITE command, and the data provided coincident with the new command applies to the new command. An example is shown in Figure 20 on page 31. Data n + 1 is either the last of a burst of two or the last desired of a longer burst. The 256Mb SDRAM uses a pipelined architecture. A WRITE command can be initiated on any clock cycle following a previous WRITE command. Full-speed random write accesses within a page can be performed to the same bank, as shown in Figure 19 on page 31, or each subsequent WRITE may be performed to a different bank.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Figure 19: WRITE Burst
T0 CLK T1 T2 T3
COMMAND
WRITE
NOP
NOP
NOP
ADDRESS
BANK, COL n
DQ
DIN n
DIN n+1
DON'T CARE
Note:
BL = 2. DQM is LOW.
Figure 20:
WRITE-to-WRITE
T0 CLK T1 T2
COMMAND
WRITE
NOP
WRITE
ADDRESS
BANK, COL n
BANK, COL b
DQ
DIN n
DIN n+1
DIN b
DON'T CARE
Note:
BL = 2. DQM is LOW. Each WRITE command may be to any bank.
Data for any WRITE burst may be truncated with a subsequent READ command, and data for a fixed-length WRITE burst may be immediately followed by a READ command. Once the READ command is registered, the data inputs will be ignored, and WRITEs will not be executed. An example is shown in Figure 21 on page 32. Data n + 1 is either the last of a burst of two or the last desired of a longer burst. Data for a fixed-length WRITE burst may be followed by, or truncated with, a PRECHARGE command to the same bank (provided that auto precharge was not activated). The PRECHARGE command should be issued tWR after the clock edge at which the last desired input data element is registered. The auto precharge mode requires a t WR of at least one clock plus time (see note 24 on page 52), regardless of frequency. In addition, when truncating a WRITE burst, the DQM signal must be used to mask input data for the clock edge prior to, and the clock edge coincident with, the PRECHARGE command. An example is shown in Figure 21 on page 32. Data n + 1 is either the last of a burst of two or the last desired of a longer burst. Following the PRECHARGE command, a subsequent command to the same bank cannot be issued until tRP is met.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
In the case of a fixed-length burst being executed to completion, a PRECHARGE command issued at the optimum time (as described above) provides the same operation that would result from the same fixed-length burst with auto precharge. The disadvantage of the PRECHARGE command is that it requires that the command and address buses be available at the appropriate time to issue the command; the advantage of the PRECHARGE command is that it can be used to truncate fixed-length bursts. Figure 21: Random WRITE Cycles
T0 CLK T1 T2 T3
COMMAND
WRITE
WRITE
WRITE
WRITE
ADDRESS
BANK, COL n
BANK, COL a
BANK, COL x
BANK, COL m
DQ
DIN n
DIN a
DIN x
DIN m
DON'T CARE
Note:
Each WRITE command may be to any bank. DQM is LOW.
Figure 22:
WRITE-to-READ
T0 CLK T1 T2 T3 T4 T5
COMMAND
WRITE
NOP
READ
NOP
NOP
NOP
ADDRESS
BANK, COL n
BANK, COL b
DQ
DIN n
DIN n+1
DOUT b
DOUT b+1
DON'T CARE
Note:
BL = 2. The WRITE command may be to any bank, and the READ command may be to any bank. DQM is LOW. CL = 2 for illustration.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Figure 23: WRITE-to-PRECHARGE
T0 CLK
tWR@ tCK 15ns
T1
T2
T3
T4
T5
T6
DQM
t RP
COMMAND
WRITE
NOP
PRECHARGE
NOP
NOP
ACTIVE
NOP
ADDRESS
BANK a, COL n
t WR
BANK (a or all)
BANK a, ROW
DQ
DIN n
DIN n+1
tWR@ tCK < 15ns
DQM
t RP
COMMAND ADDRESS
WRITE
NOP
NOP
PRECHARGE
NOP
NOP
ACTIVE
BANK a, COL n
t WR
BANK (a or all)
BANK a, ROW
DQ
DIN n
DIN n+1
DON'T CARE
Note:
DQM could remain LOW in this example if the WRITE burst is a fixed length of two.
Figure 24:
Terminating a WRITE Burst
T0 CLK T1 T2
COMMAND
WRITE
BURST TERMINATE
NEXT COMMAND
ADDRESS
BANK, COL n
(Address)
DQ
DIN n
(Data)
DON'T CARE
Note:
DQMs are LOW.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Fixed-length or WRITE bursts can be truncated with the BURST TERMINATE command. When truncating a WRITE burst, the input data applied coincident with the BURST TERMINATE command will be ignored. The last data written (provided that DQM is LOW at that time) will be the input data applied one clock previous to the BURST TERMINATE command. This is shown in Figure 22 on page 32, where data n is the last desired data element of a longer burst. PRECHARGE The PRECHARGE command (see Figure 25) is used to deactivate the open row in a particular bank or the open row in all banks. The bank(s) will be available for a subsequent row access some specified time (tRP) after the precharge command is issued. Input A10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs BA0, BA1 select the bank. When all banks are to be precharged, inputs BA0, BA1 are treated as "Don't Care." Once a bank has been precharged, it is in the idle state and must be activated prior to any READ or WRITE commands being issued to that bank. Figure 25: PRECHARGE Command
CLK CKE CS# HIGH
RAS#
CAS#
WE#
A0-A9, A11, A12
All Banks
A10
Bank Selected
BA0, BA1
BANK ADDRESS
VALID ADDRESS
DON'T CARE
Power-Down Power-down occurs if CKE is registered LOW coincident with a NOP or COMMAND INHIBIT when no accesses are in progress. If power-down occurs when all banks are idle, this mode is referred to as precharge power-down; if power-down occurs when there is a row active in any bank, this mode is referred to as active power-down. Entering power-down deactivates the input and output buffers, excluding CKE, for maximum power savings while in standby. The device may not remain in the power-down state longer than the refresh period (64ms) since no REFRESH operations are performed in this mode.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
The power-down state is exited by registering a NOP or COMMAND INHIBIT and CKE HIGH at the desired clock edge (meeting tCKS). See Figure 24. Figure 26: Power-Down
CLK tCKS CKE
(( )) (( ))
> tCKS
(( ))
COMMAND
NOP
(( )) (( ))
NOP
ACTIVE
All banks idle Input buffers gated off Enter power-down mode Exit power-down mode
tRCD tRAS tRC DON'T CARE
Deep Power-Down Deep power-down mode is a maximum power savings feature achieved by shutting off the power to the entire memory array of the device. Data in the memory array will not be retained once deep power-down mode is executed. Deep power-down mode is entered by having all banks idle then CS# and WE# held LOW with RAS# and CAS# HIGH at the rising edge of the clock, while CKE is LOW. CKE must be held LOW during deep powerdown. To exit deep power-down mode, CKE must be asserted HIGH. Upon exit of Deep PowerDown mode, at least 200s of valid clocks with either NOP or COMMAND INHIBIT commands are applied to the command bus, followed by a full Mobile SDRAM initialization sequence, is required. Clock Suspend The clock suspend mode occurs when a column access/burst is in progress and CKE is registered LOW. In the clock suspend mode, the internal clock is deactivated, "freezing" the synchronous logic. For each positive clock edge on which CKE is sampled LOW, the next internal positive clock edge is suspended. Any command or data present on the input balls at the time of a suspended internal clock edge is ignored; any data present on the DQ balls remains driven; and burst counters are not incremented, as long as the clock is suspended. (See examples in Figure 27 and Figure 28 on page 37.) Clock suspend mode is exited by registering CKE HIGH; the internal clock and related operation will resume on the subsequent positive clock edge. Burst Read/Single Write The burst read/single write mode is entered by programming the write burst mode bit (M9) in the MR to a logic 1. In this mode, all WRITE commands result in the access of a single column location (burst of one), regardless of the programmed BL. READ commands access columns according to the programmed BL and sequence, just as in the normal mode of operation (M9 = 0).
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Concurrent Auto Precharge An access command (READ or WRITE) to a second bank while an access command with auto precharge enabled on a first bank is executing is not allowed by SDRAM, unless the SDRAM supports concurrent auto precharge. Micron SDRAM support concurrent auto precharge. Four cases where concurrent auto precharge occurs are defined in the "READ with Auto Precharge" and "WRITE with Auto Precharge" sections. READ with Auto Precharge 1. Interrupted by a READ (with or without auto precharge): A READ to bank m will interrupt a READ on bank n, CL later. The precharge to bank n will begin when the READ to bank m is registered (see Figure 29 on page 37). 2. Interrupted by a WRITE (with or without auto precharge): A WRITE to bank m will interrupt a READ on bank n when registered. DQM should be used two clocks prior to the WRITE command to prevent bus contention. The precharge to bank n will begin when the WRITE to bank m is registered (see Figure 30 on page 38). Figure 27: Clock Suspend During WRITE Burst
T0 CLK T1 T2 T3 T4 T5
CKE
INTERNAL CLOCK
COMMAND
NOP
WRITE
NOP
NOP
ADDRESS
BANK, COL n
DIN
DIN n
DIN n+1
DIN n+2
DON'T CARE
Note:
For this example, BL = 4 or greater, and DM is LOW.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Figure 28: Clock Suspend During READ Burst
T0 CLK T1 T2 T3 T4 T5 T6
CKE
INTERNAL CLOCK
COMMAND
READ
NOP
NOP
NOP
NOP
NOP
ADDRESS
BANK, COL n
DQ
DOUT n
DOUT n+1
DOUT n+2
DOUT n+3
DON'T CARE
Note:
For this example, CL = 2, BL = 4 or greater, and DQM is LOW.
Figure 29:
READ with Auto Precharge Interrupted by a READ
T0 CLK
READ - AP BANK n READ - AP BANK m
T1
T2
T3
T4
T5
T6
T7
COMMAND BANK n
NOP
NOP
NOP
NOP
NOP
NOP
Page Active
READ with Burst of 4
Interrupt Burst, Precharge t RP - BANK n
Idle tRP - BANK m Precharge
Internal States
BANK m
Page Active
READ with Burst of 4
ADDRESS DQ
BANK n, COL a
BANK m, COL d DOUT a CL = 3 (bank n) CL = 3 (bank m) DOUT a+1 DOUT d DOUT d+1
DON'T CARE
Note:
DQM is LOW.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Figure 30: READ with Auto Precharge Interrupted by a WRITE
T0 CLK
READ - AP BANK n Page Active WRITE - AP BANK m
T1
T2
T3
T4
T5
T6
T7
COMMAND BANK n
NOP
NOP
NOP
NOP
NOP
NOP
READ with Burst of 4
Interrupt Burst, Precharge tRP - BANK n
Idle t WR - BANK m Write-Back
Internal States
BANK m
BANK n, COL a
Page Active
WRITE with Burst of 4
ADDRESS 1 DQM DQ
BANK m, COL d
DOUT a CL = 3 (bank n)
DIN d
DIN d+1
DIN d+2
DIN d+3
DON'T CARE
Note:
DQM is HIGH at T2 to prevent DOUT a +1 from contending with DIN d at T4.
WRITE with Auto Precharge 1. Interrupted by a READ (with or without auto precharge): A READ to bank m will interrupt a WRITE on bank n when registered, with the data-out appearing CL later. The precharge to bank n will begin after tWR is met, where tWR begins when the READ to bank m is registered. The last valid WRITE to bank n will be data-in registered one clock prior to the READ to bank m (see Figure 31 on page 39). 2. Interrupted by a WRITE (with or without auto precharge): A WRITE to bank m will interrupt a WRITE on bank n when registered. The precharge to bank n will begin after tWR is met, where tWR begins when the WRITE to bank m is registered. The last valid data WRITE to bank n will be data registered one clock prior to a WRITE to bank m (see Figure 32 on page 39).
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Operations
Figure 31: WRITE with Auto Precharge Interrupted by a READ
T0 CLK
WRITE - AP BANK n READ - AP BANK m
T1
T2
T3
T4
T5
T6
T7
COMMAND BANK n
NOP
NOP
NOP
NOP
NOP
NOP
Page Active
WRITE with Burst of 4
Interrupt Burst, Write-Back tWR - BANK n
Precharge tRP - BANK n tRP - BANK m
Internal States
BANK m
Page Active
READ with Burst of 4
ADDRESS DQ
BANK n, COL a DIN a DIN a+1
BANK m, COL d DOUT d CL = 3 (bank m) DOUT d+1
DON'T CARE
Note:
DQM is LOW.
Figure 32:
WRITE with Auto Precharge Interrupted by a WRITE
T0 CLK
WRITE - AP BANK n WRITE - AP BANK m
T1
T2
T3
T4
T5
T6
T7
COMMAND BANK n
NOP
NOP
NOP
NOP
NOP
NOP
Page Active
WRITE with Burst of 4
Interrupt Burst, Write-Back tWR - BANK n
Precharge tRP - BANK n t WR - BANK m Write-Back
Internal States
BANK m
Page Active
WRITE with Burst of 4
ADDRESS DQ
BANK n, COL a DIN a DIN a+1 DIN a+2
BANK m, COL d DIN d DIN d+1 DIN d+2 DIN d+3
DON'T CARE
Note:
DQM is LOW.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Truth Tables
Truth Tables
Table 6:
CKEn-1 L
Truth Table - CKE
Notes: 1-4 CKEn L Current State Power-down Self refresh Clock suspend Deep power-down Power-down Deep power-down Self refresh Clock suspend All banks idle All banks idle All banks idle Reading or writing Notes: Commandn X X X X COMMAND INHIBIT or NOP X COMMAND INHIBIT or NOP X COMMAND INHIBIT or NOP BURST TERMINATE AUTO REFRESH VALID See Table 8 on page 43 Actionn Maintain power-down Maintain self refresh Maintain clock suspend Maintain deep power-down Exit power-down Exit deep power-down Exit self refresh Exit clock suspend Power-down entry Deep power-down entry Self refresh entry Clock suspend entry Notes
L
H
8 5 8 6 7 8
H
L
H
H
1. CKEn is the logic state of CKE at clock edge n; CKEn-1 was the state of CKE at the previous clock edge. 2. Current state is the state of the SDRAM immediately prior to clock edge n. 3. COMMANDn is the command registered at clock edge n, and ACTIONn is a result of COMMANDn. 4. All states and sequences not shown are illegal or reserved. 5. Exiting power-down at clock edge n will put the device in the all banks idle state in time for clock edge n + 1 (provided that tCKS is met). 6. Exiting self refresh at clock edge n will put the device in the all banks idle state once tXSR is met. COMMAND INHIBIT or NOP commands should be issued on any clock edges occurring during the tXSR period. A minimum of two NOP commands must be provided during tXSR period. 7. After exiting clock suspend at clock edge n, the device will resume operation and recognize the next command at clock edge n + 1. 8. Deep power-down is power savings feature of this Mobile SDRAM device. This command is BURST TERMINATE when CKE is HIGH and deep power-down when CKE is LOW.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Truth Tables
Table 7: Truth Table - Current State Bank n, Command to Bank n
Notes: 1-6; notes appear below table Current State Any Idle CS# H L L L L L L L L L L L L L L L L Notes: RAS# CAS# X H L L L L H H L H H L H H H L H X H H L L H L L H L L H H L L H H WE# Command (Action) X H H H L L H L L H L L L H L L L COMMAND INHIBIT (NOP/Continue previous operation) NO OPERATION (NOP/Continue previous operation) ACTIVE (Select and activate row) AUTO REFRESH LMR PRECHARGE READ (Select column and start READ burst) WRITE (Select column and start WRITE burst) PRECHARGE (Deactivate row in bank or banks) READ (Select column and start new READ burst) WRITE (Select column and start WRITE burst) PRECHARGE (Truncate READ burst, start PRECHARGE) BURST TERMINATE READ (Select column and start READ burst) WRITE (Select column and start new WRITE burst) PRECHARGE (Truncate WRITE burst, start PRECHARGE) BURST TERMINATE Notes
Row active
Read (auto precharge disabled) Write (auto precharge disabled)
7 7 11 10 10 8 10 10 8 9 10 10 8 9
1. This table applies when CKEn-1 was HIGH and CKEn is HIGH (see Table 6 on page 40) and after tXSR has been met (if the previous state was self refresh). 2. This table is bank-specific, except where noted; i.e., the current state is for a specific bank and the commands shown are those allowed to be issued to that bank when in that state. Exceptions are covered in the notes below. 3. Current state definitions: Idle: Row active: Read: Write: The bank has been precharged, and tRP has been met. A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register accesses are in progress. A READ burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated. A WRITE burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated.
4. The following states must not be interrupted by a command issued to the same bank. COMMAND INHIBIT or NOP commands, or allowable commands to the other bank should be issued on any clock edge occurring during these states. Allowable commands to the other bank are determined by its current state and Table 7, and according to Table 8 on page 43. Precharging: Row activating: Read w/autoprecharge enabled: Write w/autoprecharge enabled: Starts with registration of a PRECHARGE command and ends when RP is met. Once tRP is met, the bank will be in the idle state. Starts with registration of an ACTIVE command and ends when tRCD is met. Once tRCD is met, the bank will be in the row active state. Starts with registration of a READ command with auto precharge enabled and ends when tRP has been met. Once tRP is met, the bank will be in the idle state. Starts with registration of a WRITE command with auto precharge enabled and ends whentRP has been met. Once tRP is met, the bank will be in the idle state.
t
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Truth Tables
5. The following states must not be interrupted by any executable command; DESELECT or NOP commands must be applied on each positive clock edge during these states. Refreshing: Starts with registration of an AUTO REFRESH command and ends when tRFC is met. Once tRFC is met, the Mobile SDRAM will be in the all banks idle state. Starts with registration of an LMR command and ends when tMRD has been met. Once tMRD is met, the Mobile SDRAM will be in the all banks idle state. Starts with registration of a PRECHARGE ALL command and ends when tRP is met. Once tRP is met, all banks will be in the idle state.
Accessing MR:
Precharging all:
6. All states and sequences not shown are illegal or reserved 7. Not bank-specific; requires that all banks are idle. 8. May or may not be bank-specific; if all banks are to be precharged, all must be in a valid state for precharging. 9. Not bank-specific; BURST TERMINATE affects the most recent READ or WRITE burst, regardless of bank. 10. READs or WRITEs listed in the Command (Action) column include READs or WRITEs with auto precharge enabled and READs or WRITEs with auto precharge disabled. 11. Does not affect the state of the bank and acts as a NOP to that bank.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Truth Tables
Table 8: Truth Table - Current State Bank n, Command to Bank m
Notes: 1-6; notes appear below and on next page Current State Any Idle Row activating, active, or precharging Read (auto precharge disabled) Write (auto precharge disabled) Read (with auto precharge) Write (with auto precharge) CS# H L X L L L L L L L L L L L L L L L L L L L L Notes: RAS# CAS# WE# Command (Action) X H X L H H L L H H L L H H L L H H L L H H L X H X H L L H H L L H H L L H H L L H H L L H X H X H H L L H H L L H H L L H H L L H H L L COMMAND INHIBIT (NOP/Continue previous operation) NO OPERATION (NOP/Continue previous operation) Any command otherwise allowed to bank m ACTIVE (Select and activate row) READ (Select column and start READ burst) WRITE (Select column and start WRITE burst) PRECHARGE ACTIVE (Select and activate row) READ (Select column and start new READ burst) WRITE (Select column and start WRITE burst) PRECHARGE ACTIVE (Select and activate row) READ (Select column and start READ burst) WRITE (Select column and start new WRITE burst) PRECHARGE ACTIVE (Select and activate row) READ (Select column and start new READ burst) WRITE (Select column and start WRITE burst) PRECHARGE ACTIVE (Select and activate row) READ (Select column and start READ burst) WRITE (Select column and start new WRITE burst) PRECHARGE Notes
7 7
7, 8 7, 9 10 7, 11 7, 12 10 7, 13, 14 7, 13, 15 10 7, 13, 16 7, 13, 17 10
1. This table applies when CKEn-1 was HIGH and CKEn is HIGH (see Table 6 on page 40) and after tXSR has been met (if the previous state was self refresh). 2. This table describes alternate bank operation, except where noted; i.e., the current state is for bank n and the commands shown are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is allowable). Exceptions are covered in the notes below. 3. Current state definitions: Idle: Row active: Read: Write: Read w/autoprecharge enabled: Write w/autoprecharge enabled: The bank has been precharged, and tRP has been met. A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register accesses are in progress. A READ burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated. A WRITE burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated. Starts with registration of a READ command with auto precharge enabled and ends when tRP has been met. Once tRP is met, the bank will be in the idle state. Starts with registration of a WRITE command with auto precharge enabled and ends when tRP has been met. Once tRP is met, the bank will be in the idle state.
4. AUTO REFRESH, SELF REFRESH and LMR commands may only be issued when all banks are idle.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Truth Tables
5. A BURST TERMINATE command cannot be issued to another bank; it applies to the bank represented by the current state only. 6. All states and sequences not shown are illegal or reserved. 7. READs or WRITEs to bank m listed in the Command (Action) column include READs or WRITEs with auto precharge enabled and READs or WRITEs with auto precharge disabled. 8. For a READ without auto precharge interrupted by a READ (with or without auto precharge), the READ to bank m will interrupt the READ on bank n, CL later (see Figure 11 on page 24). 9. For a READ without auto precharge interrupted by a WRITE (with or without auto precharge), the WRITE to bank m will interrupt the READ on bank n when registered (see Figure 12 on page 25 and Figure 13 on page 26). DQM should be used one clock prior to the WRITE command to prevent bus contention. 10. Burst in bank n continues as initiated. 11. For a WRITE without auto precharge interrupted by a READ (with or without auto precharge), the READ to bank m will interrupt the WRITE on bank n when registered (see Figure 20 on page 31), with the data-out appearing CL later. The last valid WRITE to bank n will be data-in registered one clock prior to the READ to bank m. 12. For a WRITE without auto precharge interrupted by a WRITE (with or without auto precharge), the WRITE to bank will interrupt the WRITE on bank n when registered (see Figure 18 on page 30). The last valid WRITE to bank n will be data-in registered one clock prior to the READ to bank m. 13. Concurrent auto precharge: Bank n will initiate the auto precharge command when its burst has been interrupted by bank m burst. 14. For a READ with auto precharge interrupted by a READ (with or without auto precharge), the READ to bank m will interrupt the READ on bank n, CL later. The PRECHARGE to bank n will begin when the READ to bank m is registered. 15. For a READ with auto precharge interrupted by a WRITE (with or without auto precharge), the WRITE to bank m will interrupt the READ on bank n when registered. DQM should be used two clocks prior to the WRITE command to prevent bus contention. The PRECHARGE to bank n will begin when the WRITE to bank m is registered. 16. For a WRITE with auto precharge interrupted by a READ (with or without auto precharge), the READ to bank m will interrupt the WRITE on bank n when registered, with the data-out appearing CL later. The PRECHARGE to bank n will begin after tWR is met, where tWR begins when the READ to bank m is registered. The last valid WRITE bank n will be data-in registered one clock prior to the READ to bank m. 17. For a WRITE with auto precharge interrupted by a WRITE (with or without auto precharge), the WRITE to bank m interrupt the WRITE on bank n when registered. The PRECHARGE to bank n will begin after tWR is met, where tWR begins when the WRITE to bank m is registered. The last valid WRITE to bank n will be data registered one clock to the WRITE to bank m.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Electrical Specifications
Electrical Specifications
Absolute Maximum Ratings
Stresses greater than those listed in Table 9 may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Table 9: Absolute Maximum Ratings
Min -0.3 -0.3 -55 Max +2.7 +2.7 +150 Units V
Voltage/Temperature Voltage on VDD/VDDQ supply relative to VSS (1.8V) Voltage on inputs, NC or I/O balls relative to VSS (1.8V) Storage temperature plastic
Table 10:
DC Electrical Characteristics and Operating Conditions
Notes: 1, 5, 6; notes appear on page 51 and 52; VDD/VDDQ = 1.7-1.95V Symbol VDD VDDQ VIH VIL VOH VOL II Min Max Units V V V V V V A Notes
Parameter/Condition Supply voltage I/O supply voltage Input high voltage: Logic 1; All inputs Input low voltage: Logic 0; All inputs Output high voltage: All inputs: Iout = -4mA Output low voltage: All inputs: Iout = 4mA Input leakage current: Any input 0V VIN VDD (All other balls not under test = 0V) Operating temperature TA (commercial) TA (industrial)
1.7 1.95 1.7 1.95 0.8 x VDDQ VDDQ + 0.3 -0.3 +0.3 0.9 x VDDQ - - 0.2 -1.0 1.0
22 22
+70 +85
C
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Electrical Specifications
Table 11: Electrical Characteristics and Recommended AC Operating Conditions
Notes: 5, 6, 8, 9, 11; notes appear on page 51 and 52 AC Characteristics Parameter Access time from CLK (pos. edge) Address hold time Address setup time CLK high-level width CLK low-level width Clock cycle time CKE hold time CKE setup time CS#, RAS#, CAS#, WE#, DQM hold time CS#, RAS#, CAS#, WE#, DQM setup time Data-in hold time Data-in setup time Data-out High-Z time Data-out Low-Z time Data-out hold time (load) Data-out hold time (no load) ACTIVE-to-PRECHARGE command ACTIVE-to-ACTIVE command period ACTIVE-to-READ or WRITE delay Refresh period (8,192 rows) AUTO REFRESH period PRECHARGE command period ACTIVE bank a to ACTIVE bank b command Transition time WRITE recovery time Exit SELF REFRESH to ACTIVE command CL = 3 CL = 2 Symbol
t t
-75 Min Max 6 8 1 1.5 3 3 7.5 9.6 1 2.5 1 1.5 1 1.5 6 9 1 2.5 1.8 44 67.5 19 80 19 2 0.3 15 80 1 2.5 1.8 48 72 20 80 19 2 0.5 15 80 1 2.5 3 3 8 10 1 2.5 1 2.5 1 2.5 Min
-8 Max 7 9 Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ms ns ns tCK ns ns ns Notes 9
CL = 3 CL = 2
CL = 3 CL = 2
AC (3) AC (2) t AH t AS t CH t CL tCK (3) tCK (2) t CKH tCKS tCMH tCMS tDH tDS tHZ (3) tHZ (2) tLZ tOH t OHN tRAS tRC tRCD tREF tRFC tRP tRRD tT tWR t XSR
23 23
7 9
10 10
25
120,000
120,000
64
64
1.2
1.2
7 31 20
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Electrical Specifications
Table 12:
Parameter READ/WRITE command to READ/WRITE command CKE to clock disable or power-down entry mode CKE to clock enable or power-down exit setup mode DQM to input data delay DQM to data mask during WRITEs DQM to data High-Z during READs WRITE command to input data delay Data-in to ACTIVE command Data-in to PRECHARGE command Last data-in to burst STOP command Last data-in to new READ/WRITE command Last data-in to PRECHARGE command LMR command to ACTIVE or REFRESH command Data-out High-Z from PRECHARGE command
AC Functional Characteristics
Notes: 5, 6, 8, 9,11 notes appear on page 51 and 52 Symbol CCD CKED t PED t DQD tDQM t DQZ t DWD t DAL t DPL t BDL t CDL tRDL tMRD tROH(3) tROH(2)
t t
-75 1 1 1 0 0 2 0 5 2 1 1 2 2 3 2
-8 1 1 1 0 0 2 0 5 2 1 1 2 2 3 2
Units
t t
Notes 17 14 14 17 17 17 17 15, 21 16, 21 17 17 16, 21 25 17 17
CL = 3 CL = 2
CK CK t CK t CK tCK t CK t CK t CK t CK t CK t CK tCK tCK tCK tCK
Table 13:
IDD Specifications and Conditions (x16)
Notes: 1, 5, 6, 11, 13; notes appear on page 51 and 52; VDD/VDDQ = 1.7-1.95V Max
Parameter/Condition Operating current: Active mode; BL = 1; READ or WRITE; tRC = tRC (MIN) Standby current: Power-down mode; All banks idle; CKE = LOW Standby current: Non-power-down mode; All banks idle; CKE = HIGH Standby current: Active mode; CKE = LOW; CS# = HIGH; All banks active; No accesses in progress Standby current: Active mode; CKE = HIGH; CS# = HIGH; All banks active after tRCD met; No accesses in progress Operating current: Burst mode; READ or WRITE; All banks active, half DQs toggling every cycle tRFC = tRFC (MIN) Auto refresh current: tRFC = 7.8125s CKE = HIGH; CS# = HIGH Deep power-down
Symbol IDD1 IDD2P IDD2N IDD3P
-75 65 300 20 5
-8 60 300 20 5
Units mA A mA mA
Notes 1, 18, 19 30
1, 12, 19 1, 12, 19 1, 18, 19 1, 12, 18 19, 26 29, 30
IDD3N
25
25
mA
IDD4
90
85
mA
IDD5 IDD6 IZZ
100 5 10
95 5 10
mA mA A
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Electrical Specifications
Table 14: IDD Specifications and Conditions (x32)
Notes: 1, 5, 6, 11, 13; notes appear on page 51 and 52; VDD/VDDQ = 1.7-1.95V Max Parameter/Condition Operating current: Active mode; BL = 1; READ or WRITE; tRC = tRC (MIN) Standby current: Power-down mode; All banks idle; CKE = LOW Standby current: Non-power-down mode; All banks idle; CKE = HIGH Standby current: Active mode; CKE = LOW; CS# = HIGH; All banks active; No accesses in progress Standby current: Active mode; CKE = HIGH; CS# = HIGH; All banks active after tRCD met; No accesses in progress Operating current: Burst mode; READ or WRITE; All banks active, half DQs toggling every cycle tRFC = tRFC (MIN) Auto refresh current: CKE = HIGH; CS# = HIGH tRFC = 7.8125s Deep power-down Symbol IDD1 IDD2P IDD2N IDD3P -75 95 300 20 5 -8 90 300 20 5 Units mA A mA mA 1, 12, 19 1, 12, 19 1, 18, 19 1, 12, 18, 26 19, 27 29, 30 Notes 1, 18, 19 30
IDD3N
25
25
mA
IDD4
120
115
mA
IDD5 IDD6 IZZ
100 5 10
95 5 10
mA mA A
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Table 15: IDD7 - Self Refresh Current Options
Notes: 2, 28, 30; notes appear on page 51 and page 52 Temperature-Compensated Self Refresh Parameter/Condition Self refresh current: CKE = LOW - 4-bank refresh Maximum Temperature 85C 70C 45C 15C 85C 70C 45C 15C 85C 70C 45C 15C 85C 70C 45C 15C 85C 70C 45C 15C Low IDD7 Option "L" 220 175 140 125 200 150 130 115 185 140 120 115 175 125 115 110 170 120 110 105 Standard IDD7 300 210 190 180 275 180 160 150 265 160 140 140 255 150 130 125 250 140 120 115 Units A A A A A A A A A A A A A A A A A A A A
Self refresh current: CKE = LOW - 2-bank refresh
Self refresh current: CKE = LOW - 1-bank refresh
Self refresh current: CKE = LOW - Half-bank refresh
Self refresh current: CKE = LOW - Quarter-bank refresh
Figure 33:
150
Typical Self Refresh Current vs. Temperature
Full Array 1/2 Array
125
1/4 Array 1/8 Array Temperature (C) 1/16 Array
Current (A)
100
75
50
25
0 -40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
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Table 16: Capacitance
Note: 2; notes appear on page 51 and 52 Parameter Input capacitance: CLK Input capacitance: All other input-only balls Input/output capacitance: DQs Symbol CI1 CI2 CIO Min 1.5 2.0 2.0 Max 4.5 4.5 6.0 Units pF pF pF
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Notes
Notes
1. All voltages referenced to VSS. 2. This parameter is sampled. VDD, VDDQ = +1.8V; TA = 25C; ball under test biased at 0.9V; f = 1 MHz. 3. IDD is dependent on output loading and cycle rates. Specified values are obtained with minimum cycle time and the outputs open. 4. Enables on-chip refresh and address counters. 5. The minimum specifications are used only to indicate cycle time at which proper operation over the full temperature range (-40C TA +85C for TA on IT parts) is ensured. 6. An initial pause of 100s is required after power-up, followed by two AUTO REFRESH commands, before proper device operation is ensured. (VDD and VDDQ must be powered up simultaneously. VSS and VSSQ must be at same potential.) The two AUTO REFRESH command wake-ups should be repeated any time the tREF refresh requirement is exceeded. 7. AC characteristics assume tT = 1ns. 8. In addition to meeting the transition rate specification, the clock and CKE must transit between VIH and VIL (or between VIL and VIH) in a monotonic manner. 9. Outputs measured for 1.8V at 0.9V with equivalent load:
Q
20pF
10.
11.
12. 13. 14. 15. 16. 17. 18. 19. 20. 21.
Test loads with full DQ driver strength. Performance will vary with actual system DQ bus capacitive loading, termination, and programmed drive strength. tHZ defines the time at which the output achieves the open circuit condition; it is not a reference to VOH or VOL. The last valid data element will meet tOH before going High-Z. AC timing and IDD tests have VIL and VIH, with timing referenced to VIH/2 = crossover point. If the input transition time is longer than tT (MAX), then the timing is referenced at VIL (MAX) and VIH (MIN) and no longer at the VIH/2 crossover point. Other input signals are allowed to transition no more than once every two clocks and are otherwise at valid VIH or VIL levels. IDD specifications are tested after the device is properly initialized. Timing actually specified by tCKS; clock(s) specified as a reference only at minimum cycle rate. Timing actually specified by tWR plus tRP; clock(s) specified as a reference only at minimum cycle rate. Timing actually specified by tWR. Required clocks are specified by JEDEC functionality and are not dependent on any timing parameter. The IDD current will increase or decrease proportionally according to the amount of frequency alteration for the test condition. Address transitions average one transition every two clocks. CLK must be toggled a minimum of two times during this period. Based on tCK = 7.5ns for -75,tCK = 8ns for -8, at CL = 3.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Notes
22. VIH overshoot: VIH (MAX) = VDDQ + 2V for a pulse width 3ns, and the pulse width cannot be greater than one third of the cycle rate. VIL undershoot: VIL (MIN) = -2V for a pulse width 3ns. 23. The clock frequency can only be changed during clock stop, power-down, or while in a self-refresh mode. 24. Auto precharge mode only. The precharge timing budget (tRP) begins at 7ns for -8 after the first clock delay, after the last WRITE is executed. May not exceed limit set for precharge mode.The clock frequency can only be changed during 25. Parameter guaranteed by design. 26. CKE is HIGH during refresh command period tRFC (MIN) else CKE is LOW. 27. The IDD6 limit is actually a nominal value and does not result in a fail value. 28. Values for IDD7 for 70C, 45C, 15C, and IDD7 1/2-bank and 1/4-bank are sampled only. Values for IDD7 4-bank, 2-bank, and 1-bank for 85C are 100 percent tested. 29. Deep power-down current is a nominal value at 25C. This parameter is not tested. 30. Test conditions include 500ms delay prior to measurement. 31. Auto precharge mode only. The precharge timing budget (tRP) begins at 7.5ns for -75 and 7ns for -8 after the first clock delay, after the last WRITE is executed. For auto precharge mode, at least one clock cycle is required during tWR.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Timing Diagrams
Figure 34: Initialize and Load Mode Register
T0
CLK
(( )) (( ))
T1
(( )) (( ))
Tn + 1
(( )) (( ))
To + 1
(( )) (( ))
Tp + 1
(( )) (( ))
Tq + 1
(( )) (( ))
Tr + 1
(( )) (( ))
tCK tCKS tCKH
CKE
(( )) (( )) (( )) (( )) (( )) (( ))
tCMS tCMH NOP PRE
(( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( )) (( )) (( ))
COMMAND1
AR
AR
LMR
LMR
VALID
DQM
tAS tAH
ADDR
(( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( )) (( ))
CODE
(( )) (( )) (( )) (( )) (( )) (( ))
CODE
(( )) (( )) (( )) (( )) (( )) (( ))
VALID
(( )) (( )) (( )) (( )) (( )) (( ))
ALL BANKS
A10
(( )) (( )) (( )) (( ))
(( )) (( )) (( )) (( ))
CODE
CODE
VALID
tAS tAH
t AS tAH BA0 = L, BA1 = L BA0 = L, BA0 = L, BA1 = H BA1 = L
VALID
BA0, BA1
DQ
(( ))
High-Z
(( ))
tRP
(( ))
tRFC2
(( ))
tRFC2
(( ))
tMRD3
(( ))
tMRD3
(( ))
T = 100s
Power-up: VDD and CLK stable
Precharge all banks
Load Mode Register
Load Extended Mode Register DON'T CARE
Notes:
1. PRE = PRECHARGE command; AR = AUTO REFRESH command; LMR = LOAD MODE REGISTER command. 2. Only NOPs or COMMAND INHIBITs may be issued during tRFC time. 3. At least one NOP or COMMAND INHIBIT is required during tMRD time.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 35: Power-Down Mode
T0 CLK tCK T1 tCL tCKS CKE tCKS tCKH tCH T2
(( )) (( ))
Tn + 1
Tn + 2
tCKS
(( ))
tCMS tCMH COMMAND
PRECHARGE NOP NOP
(( )) (( ))
NOP
ACTIVE
DQM
(( )) (( ))
ADDR
ALL BANKS
(( )) (( )) (( )) (( ))
ROW
A10
SINGLE BANK
ROW
tAS BA0, BA1
tAH
(( )) (( ))
BANK(S)
High-Z
BANK
DQ Two clock cycles Precharge all active banks All banks idle, enter power-down mode
(( ))
Input buffers gated off while in power-down mode All banks idle Exit power-down mode DON'T CARE
Notes:
1. Violating refresh requirements during power-down may result in a loss of data. See Table 11 on page 46.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 36:
T0 CLK tCK
Clock Suspend Mode
T1 tCL tCH tCKS tCKH T2 T3 T4 T5 T6 T7 T8 T9
CKE tCKS tCKH
tCMS tCMH COMMAND
READ NOP NOP NOP NOP NOP WRITE NOP
tCMS tCMH DQM tAS ADDR tAH
COLUMN e
COLUMN m2
tAS A10 tAS BA0, BA1
tAH
tAH
BANK BANK
tAC DQ tLZ
DOUT m
tAC tOH
tHZ
DOUT m + 1
tDS
tDH
DOUT e + 1
DOUT e
DON'T CARE UNDEFINED
Notes:
1. For this example, BL = 2, CL = 3, and auto precharge is disabled.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 37: Auto Refresh Mode
T0
CLK tCK
T1
T2
tCH
(( )) (( ))
Tn + 1
tCL
(( )) (( )) (( ))
To + 1
CKE
(( )) tCKS
tCMS
tCKH
tCMH
NOP AUTO REFRESH
COMMAND
PRECHARGE
NOP
(( )) ( ( NOP ))
AUTO REFRESH
NOP
(( )) ( ( NOP )) (( )) (( ))
(( )) (( )) (( )) (( ))
ACTIVE
DQM
(( )) (( ))
(( )) (( ))
ALL BANKS
ADDR
ROW
A10
SINGLE BANK
(( )) (( ))
ROW
tAS
tAH (( )) (( ))
(( )) tRP tRFC tRFC
BA0, BA1
BANK(S)
(( )) (( ))
(( ))
BANK
DQ High-Z
Precharge all active banks
DON'T CARE
UNDEFINED
Notes:
1. Each AUTO REFRESH command performs a REFRESH cycle. Back-to-back commands are not required. See Table 11 on page 46.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 38: Self Refresh Mode
T0 CLK tCK T1 tCH tCL T2
(( )) (( ))
Tn + 1
tCKS
> tRAS
(( )) (( )) (( )) (( ))
To + 1
To + 2
CKE tCKS tCMS COMMAND tCKH tCMH
NOP AUTO REFRESH
(( ))
PRECHARGE
(( )) (( )) (( )) (( )) (( )) (( ))
NOP ( (
(( ))
AUTO REFRESH
))
DQM
(( )) (( )) (( )) (( )) (( )) (( ))
ADDR
ALL BANKS
A10
SINGLE BANK
(( )) (( ))
t AS BA0, BA1
tAH
(( )) (( )) (( )) (( ))
BANK(S)
DQ
High-Z tRP Precharge all active banks Enter self refresh mode
(( ))
(( ))
tXSR Exit self refresh mode (Restart refresh time base) DON'T CARE
CLK stable prior to exiting self refresh mode
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 39: READ - without Auto Precharge
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP READ NOP NOP NOP PRECHARGE NOP ACTIVE
T1 tCK tCKH tCL
T2 tCH
T3
T4
T5
T6
T7
T8
ACTIVE
tCMS DQM tAS ADDR tAS A10 tAS BA0, BA1 tAH
ROW
tCMH
COLUMN m
ROW
tAH
ROW
ALL BANKS ROW DISABLE AUTO PRECHARGE BANK SINGLE BANK BANK(S) BANK
tAH
BANK
tAC DQ tRCD tRAS tRC CL tLZ
tAC tOH
DOUT m
tAC tOH
DOUT m + 1
tAC tOH
DOUT m + 2
tOH
DOUT m + 3
tRP
tHZ
DON'T CARE UNDEFINED
Notes:
1. For this example, BL = 4, CL = 2, and the READ burst is followed by a manual PRECHARGE.
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256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 40: READ - with Auto Precharge
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP READ NOP NOP NOP NOP NOP ACTIVE
T1 tCK tCKH tCL
T2 tCH
T3
T4
T5
T6
T7
T8
ACTIVE
tCMS DQM tAS ADDR tAS A10 tAS BA0, BA1 tAH
ROW
tCMH
COLUMN m ENABLE AUTO PRECHARGE
ROW
tAH
ROW
ROW
tAH
BANK BANK BANK
tAC DQ tRCD tRAS tRC CL tLZ
tAC tOH
DOUT m
tAC tOH
DOUT m + 1
tAC tOH
DOUT m + 2
tOH
DOUT m + 3
tRP
tHZ
DON'T CARE UNDEFINED
Notes:
1. For this example, BL = 4, CL = 2.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 41: Single READ - without Auto Precharge
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP READ NOP2 NOP2 PRECHARGE NOP ACTIVE NOP
T1 tCK tCKH tCL
T2 tCH
T3
T4
T5
T6
T7
T8
ACTIVE
tCMS DQM tAS ADDR tAS A10 tAS BA0, BA1 tAH
ROW
tCMH
COLUMN m
ROW
tAH
ROW
ALL BANKS ROW DISABLE AUTO PRECHARGE BANK SINGLE BANK BANK(S) BANK
tAH
BANK
tAC DQ tRCD tRAS tRC CL tLZ
tOH
DOUT m
tHZ
tRP
DON'T CARE UNDEFINED
Notes:
1. For this example, BL = 4, CL = 2, and the READ burst is followed by a manual PRECHARGE. 2. PRECHARGE command not allowed or tRAS would be violated. See Table 11 on page 46.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 42: Single READ - with Auto Precharge
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP NOP2 NOP2 READ NOP NOP ACTIVE NOP
T1 tCK tCKH tCL
T2 tCH
T3
T4
T5
T6
T7
T8
ACTIVE
tCMS DQM tAS ADDR tAS A10 tAS BA0, BA1 tAH
ROW
tCMH
COLUMN m ENABLE AUTO PRECHARGE
ROW
tAH
ROW
ROW
tAH
BANK BANK BANK
tAC DQ tRCD tRAS tRC CL tRP
tOH
DOUT m
tHZ
DON'T CARE UNDEFINED
Notes:
1. For this example, BL = 4, CL = 2, and the READ burst is followed by a manual PRECHARGE. 2. PRECHARGE command not allowed or tRAS would be violated. See Table 11 on page 46.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 43: Alternating Bank Read Accesses
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP READ NOP ACTIVE NOP READ NOP ACTIVE
T1 tCK tCKH tCL
T2 tCH
T3
T4
T5
T6
T7
T8
ACTIVE
tCMS DQM tAS ADDR tAH
tCMH
ROW
COLUMN m
ROW
COLUMN b 2
ROW
tAS A10
tAH
ENABLE AUTO PRECHARGE ROW
ENABLE AUTO PRECHARGE ROW
ROW
tAS BA0, BA1
tAH
BANK 0 BANK 3 BANK 3 BANK 0
BANK 0
tAC DQ tRCD - bank 0 tRAS - bank 0 tRC - bank 0 tRRD CL - bank 0 tLZ
tAC tOH
DOUT m
tAC tOH
DOUT m + 1
tAC tOH
DOUT m + 2
tAC tOH
DOUT m + 3
tAC tOH
DOUT b
tRP - bank 0
tRCD - bank 0
tRCD - bank 4
CL - bank 4
DON'T CARE UNDEFINED
Notes:
1. For this example, BL = 4, CL = 2.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 44: READ - DQM Operation
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP READ NOP NOP NOP NOP NOP NOP
T1 tCK tCKH tCL
T2 tCH
T3
T4
T5
T6
T7
T8
ACTIVE
tCMS DQM tAS ADDR tAS A10 tAS BA0, BA1 tAH
ROW
tCMH
COLUMN m ENABLE AUTO PRECHARGE
tAH
ROW
tAH
BANK
DISABLE AUTO PRECHARGE BANK
tAC tAC DQ tLZ tRCD CL
DOUT m
tOH tLZ
tAC
tOH
DOUT m + 2
tOH
DOUT m + 3
tHZ
tHZ
DON'T CARE UNDEFINED
Notes:
1. For this example, CL = 2.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 45:
CLK tCKS CKE tCMS COMMAND tCMH
NOP WRITE NOP NOP NOP NOP PRECHARGE NOP ACTIVE
WRITE - without Auto Precharge
T0 tCK tCKH T1 tCL T2 tCH T3 T4 T5 T6 T7 T8 T9
ACTIVE
tCMS tCMH DQM tAS ADDR tAH
COLUMN m ALL BANKS ROW DISABLE AUTO PRECHARGE BANK SINGLE BANK BANK BANK ROW
ROW
tAS A10
tAH
ROW
tAS BA0, BA1
tAH
BANK
tDS DQ tRCD tRAS tRC
tDH
tDS
tDH
tDS
tDH
tDS
tDH
DIN m
DIN m + 1
DIN m + 2
DIN m + 3 tWR2 tRP
DON'T CARE
Notes:
1. For this example, BL = 4, and the WRITE burst is followed by a manual PRECHARGE. 2. 15ns is required between and the PRECHARGE command, regardless of frequency.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 46:
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP WRITE NOP NOP NOP NOP NOP NOP ACTIVE
WRITE - with Auto Precharge
tCK tCKH T1 tCL T2 tCH T3 T4 T5 T6 T7 T8 T9
ACTIVE
tCMS tCMH DQM tAS ADDR tAH
COLUMN m ENABLE AUTO PRECHARGE ROW ROW
ROW
tAS A10
tAH
ROW
tAS BA0, BA1
tAH
BANK BANK
BANK
tDS DQ tRCD tRAS tRC
tDH DIN m
tDS
tDH
tDS
tDH
tDS
tDH
DIN m + 1
DIN m + 2
DIN m + 3 tWR2 tRP
DON'T CARE UNDEFINED
Notes:
1. For this example, BL = 4.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 47: Single WRITE - without Auto Precharge
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP WRITE NOP3 NOP3 PRECHARGE NOP ACTIVE NOP
T1 tCK tCKH tCL
T2 tCH
T3
T4
T5
T6
T7
T8
ACTIVE
tCMS DQM tAS ADDR tAS A10 tAS BA0, BA1 tAH
ROW
tCMH
COLUMN m
tAH
ROW
ALL BANKS ROW DISABLE AUTO PRECHARGE BANK SINGLE BANK BANK BANK
tAH
BANK
tDS DQ tRCD tRAS tRC
tDH
DIN m tWR2 tRP
DON'T CARE
Notes:
1. For this example, BL = 1, and the WRITE burst is followed by a manual PRECHARGE. 2. 15ns is required between and the PRECHARGE command, regardless of frequency. 3. PRECHARGE command not allowed or tRAS would be violated. See Table 11 on page 46.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 48:
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP3 NOP3 NOP3 WRITE NOP NOP NOP ACTIVE NOP
Single WRITE - with Auto Precharge
T1 tCK tCKH tCL tCH T2 T3 T4 T5 T6 T7 T8 T9
ACTIVE
tCMS DQM tAS ADDR tAS A10 tAS BA0, BA1 tAH
ROW
tCMH
COLUMN m ENABLE AUTO PRECHARGE
ROW
tAH
ROW
ROW
tAH
BANK BANK BANK
tDS DQ tRCD tRAS tRC
tDH
DIN m tWR tRP
DON'T CARE
Notes:
1. For this example, BL = 1, and the WRITE burst is followed by a manual PRECHARGE. 2. 15ns is required between and the PRECHARGE command, regardless of frequency. 3. WRITE command not allowed or tRAS would be violated. See Table 11 on page 46.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 49:
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP WRITE NOP ACTIVE NOP WRITE NOP NOP ACTIVE
Alternating Bank Write Accesses
T1 tCK tCKH tCL tCH T2 T3 T4 T5 T6 T7 T8 T9
ACTIVE
tCMS DQM tAS ADDR tAH
tCMH
ROW
COLUMN m
ROW
2 COLUMN b
ROW
tAS A10
tAH
ENABLE AUTO PRECHARGE ROW
ENABLE AUTO PRECHARGE ROW
ROW
tAS BA0, BA1
tAH
BANK 0 BANK 1 BANK 1 BANK 0
BANK 0
tDS DQ tRCD - bank 0 tRAS - bank 0 tRC - bank 0 tRRD
tDH
tDS
tDH
tDS
tDH
tDS
tDH
tDS
tDH
tDS
tDH
tDS
tDH
tDS
tDH
DIN m
DIN m + 1
DIN m + 2
DIN m + 3
DIN b
DIN b + 1
DIN b + 2 tRP - bank 0
DIN m + 3 tRCD - bank 0
tWR - bank 0
tWR - bank 1 tRCD - bank 1
DON'T CARE
Notes:
1. For this example, BL = 4.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Timing Diagrams
Figure 50: WRITE - DQM Operation
T0 CLK tCKS CKE tCMS COMMAND tCMH
NOP WRITE NOP NOP NOP NOP NOP
T1 tCK tCKH tCL
T2 tCH
T3
T4
T5
T6
T7
ACTIVE
tCMS tCMH DQM tAS ADDR tAH
COLUMN m ENABLE AUTO PRECHARGE
ROW
tAS A10
tAH
ROW
tAS BA0, BA1
tAH
DISABLE AUTO PRECHARGE BANK
BANK
tDS DQ tRCD
tDH
DIN m
tDS
tDH
tDS
tDH
DIN m + 2
DIN m + 3
DON'T CARE
Notes:
1. For this example, BL = 4.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Package Dimensions
Package Dimensions
Figure 51: 54-Ball VFBGA (8mm x 9mm)
0.65 0.05
SEATING PLANE 0.10 A 54X O0.45 SOLDER BALL DIAMETER REFERS TO POST REFLOW CONDITION. THE PREREFLOW DIAMETER IS 0.42 ON A 0.40 SMD BALL PAD. BALL A9 A SOLDER BALL MATERIAL: 96.5% Sn, 3% Ag, 0.5% Cu SUBSTRATE MATERIAL: PLASTIC LAMINATE MOLD COMPOUND: EPOXY NOVOLAC 6.40 0.80 TYP BALL A1 ID BALL A1 MICRON LOGO TO BE LASED BALL A1 ID
4.50 0.05
6.40 3.20
C L
9.00 0.10
0.80 TYP
C L 3.20 4.00 0.05 8.00 0.10 1.00 MAX
Notes:
1. All dimensions are in millimeters.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.
256Mb: 16 Meg x 16, 8 Meg x 32 Mobile SDRAM Package Dimensions
Figure 52: 90-Ball VFBGA (8mm x 13mm)
0.65 0.05
SEATING PLANE A SOLDER BALL MATERIAL: 96.5% Sn, 3%Ag, 0.5% Cu SUBSTRATE MATERIAL: PLASTIC LAMINATE MOLD COMPOUND: EPOXY NOVOLAC 0.80 TYP BALL A1 ID
0.10 A 90X O0.45 DIMENSIONS APPLY TO SOLDER BALLS POST REFLOW. THE PREREFLOW DIAMETER IS 0.42 ON A 0.40 SMD BALL PAD BALL A9
6.40
BALL A1 ID BALL A1
11.20 0.10 C L 13.00 0.10
5.60 0.05 6.50 0.05
C L 3.20 4.00 0.05 1.00 MAX
8.00 0.10
Notes:
1. All dimensions are in millimeters.
(R)
8000 S. Federal Way, P.O. Box 6, Boise, ID 83707-0006, Tel: 208-368-3900 prodmktg@micron.com www.micron.com Customer Comment Line: 800-932-4992 Micron, the M logo, and the Micron logo are trademarks of Micron Technology, Inc. All other trademarks are the property of their respective owners. This data sheet contains minimum and maximum limits specified over the complete power supply and temperature range for production devices. Although considered final, these specifications are subject to change, as further product development and data characterization sometimes occur.
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Micron Technology, Inc., reserves the right to change products or specifications without notice. (c)2006 Micron Technology, Inc. All rights reserved.

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