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AS4SD8M16 Datasheet(PDF) 25 Page - Micross Components |
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AS4SD8M16 Datasheet(HTML) 25 Page - Micross Components |
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25 / 52 page  SDRAM AS4SD8M16 AS4SD8M16 Rev. 1.6 March 27, 2015 Micross Components reserves the right to change products or specifications without notice. 25 TRUTH TABLE 4: CURRENT STATE BANK n, COMMAND TO BANK m1,2,3,4,5,6 CURRENT STATE CS\ RAS\ CAS\ WE\ COMMAND (ACTION) NOTES H X X X COMMAND INHIBIT (NOP/Continue previous operation) L H H H NO OPERATION (NOP/Continue previous operation) Idle XXXX Any Command Otherwise Allowed to Bank m L L H H ACTIVE (Select and active 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 L L H H ACTIVE (Select and active row) L H L H READ (Select column and start new READ burst) 7, 10 L H L L WRITE (Select column and start WRITE burst) 7, 11 L L H L PRECHARGE 9 L L H H ACTIVE (Select and active row) L H L H READ (Select column and start READ burst) 7, 12 L H L L WRITE (Select column and start new WRITE burst) 7, 13 L L H L PRECHARGE 9 L L H H ACTIVE (Select and active row) L H L H READ (Select column and start new READ burst) 7, 8, 14 L H L L WRITE (Select column and start WRITE burst) 7, 8, 15 L L H L PRECHARGE 9 L L H H ACTIVE (Select and active row) L H L H READ (Select column and start READ burst) 7, 8, 16 L H L L WRITE (Select column and start new WRITE burst) 7, 8, 17 L L H L PRECHARGE 9 Write (Auto Precharge Disabled) Row Activating, Active, or Precharging Read (with Auto Precharge) Write (with Auto Precharge) Any Read (Auto Precharge Disabled) NOTES: 1. This table applies when CKE n-1 was HIGH and CKEn is HIGH (see Truth Table 2) 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 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, and t RP has been met. Row Active: A row in the bank has been activated, and t RCD 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 or been terminated. Write: A WRITE burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated. Read w/ Auto Precharge Enabled: Starts with registration of a READ command with auto precharge enabled and ends when t RP has been met. Once t RP is met, the bank will be in the idle state. Write w/ Auto Precharge Enabled: Starts with registration of a WRITE command with auto precharge enabled and ends when t RP has been met. Once t RP is met, the bank will be in the idle state. 4. AUTO REFRESH, SELF REFRESH and LOAD MODE REGISTER commands may only be issued when all banks are idle. 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. (continued on next page) |
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