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MT47H64M8B6-25ELDTR Datasheet(PDF) 73 Page - Micron Technology |
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MT47H64M8B6-25ELDTR Datasheet(HTML) 73 Page - Micron Technology |
73 / 133 page Table 39: Truth Table – Current State Bank n – Command to Bank m Notes: 1–6 apply to the entire table Current State CS# RAS# CAS# WE# Command/Action Notes Any H X X X DESELECT (NOP/continue previous operation) L H H H NO OPERATION (NOP/continue previous operation) Idle X X X X Any command otherwise allowed to bank m Row active, active, or precharge L L H H ACTIVATE (select and activate row) L H L H READ (select column and start READ burst) 7 L H L L WRITE (select column and start WRITE burst) 7 L L H L PRECHARGE Read (auto precharge disabled) L L H H ACTIVATE (select and activate row) L H L H READ (select column and start new READ burst) 7 L H L L WRITE (select column and start WRITE burst) 7, 8 L L H L PRECHARGE Write (auto precharge disabled) L L H H ACTIVATE (select and activate row) L H L H READ (select column and start READ burst) 7, 9, 10 L H L L WRITE (select column and start new WRITE burst) 7 L L H L PRECHARGE Read (with auto precharge) L L H H ACTIVATE (select and activate row) L H L H READ (select column and start new READ burst) 7 L H L L WRITE (select column and start WRITE burst) 7, 8 L L H L PRECHARGE Write (with auto precharge) L L H H ACTIVATE (select and activate row) L H L H READ (select column and start READ burst) 7, 10 L H L L WRITE (select column and start new WRITE burst) 7 L L H L PRECHARGE Notes: 1. This table applies when CKEn - 1 was HIGH and CKEn is HIGH and after tXSNR has been met (if the previous state was self refresh). 2. This table describes an alternate bank operation, except where noted (the current state is for bank n and the commands shown are those allowed to be issued to bank m, as- suming 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: The bank has been precharged, tRP has been met, and any READ burst is complete. Row active: A row in the bank has been activated and tRCD has been met. No data bursts/accesses and no register accesses are in progress. Read: A READ burst has been initiated with auto precharge disabled and has not yet terminated. Write: A WRITE burst has been initiated with auto precharge disabled and has not yet terminated. 512Mb: x4, x8, x16 DDR2 SDRAM Commands PDF: 09005aef82f1e6e2 512MbDDR2.pdf - Rev. T 2/12 EN 73 Micron Technology, Inc. reserves the right to change products or specifications without notice. 2004 Micron Technology, Inc. All rights reserved. |
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