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AS4SD16M16 Datasheet(PDF) 25 Page - Micross Components |
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AS4SD16M16 Datasheet(HTML) 25 Page - Micross Components |
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25 / 52 page  SDRAM AS4SD16M16 AS4SD16M16 Rev. 2.6 04/13/15 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 previ- ous 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.. All states and sequences not shown are illegal or reserved. (continued on next page) |
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