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IS42S16400D-7TLI Datasheet(PDF) 10 Page - Integrated Silicon Solution, Inc |
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IS42S16400D-7TLI Datasheet(HTML) 10 Page - Integrated Silicon Solution, Inc |
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10 / 57 page  IS42S16400D ISSI® 10 Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774 Rev. C 07/05/06 TRUTH TABLE – CURRENT STATE BANK n, COMMAND TO BANK m (1-6) CURRENT STATE COMMAND (ACTION) CS RAS CAS WE Any COMMAND INHIBIT (NOP/Continue previous operation) H X X X NO OPERATION (NOP/Continue previous operation) L H H H Idle Any Command Otherwise Allowed to Bank m XX XX Row ACTIVE (Select and activate row) L L H H Activating, READ (Select column and start READ burst)(7) LH LH Active, or WRITE (Select column and start WRITE burst)(7) LH L L Precharging PRECHARGE L L H L Read ACTIVE (Select and activate row) L L H H (Auto READ (Select column and start new READ burst)(7,10) LH LH Precharge WRITE (Select column and start WRITE burst)(7,11) LH L L Disabled) PRECHARGE(9) LL H L Write ACTIVE (Select and activate row) L L H H (Auto READ (Select column and start READ burst)(7,12) LH LH Precharge WRITE (Select column and start new WRITE burst)(7,13) LH L L Disabled) PRECHARGE(9) LL H L Read ACTIVE (Select and activate row) L L H H (With Auto READ (Select column and start new READ burst)(7,8,14) LH LH Precharge) WRITE (Select column and start WRITE burst)(7,8,15) LH L L PRECHARGE(9) LL H L Write ACTIVE (Select and activate row) L L H H (With Auto READ (Select column and start READ burst)(7,8,16) LH LH Precharge) WRITE (Select column and start new WRITE burst)(7,8,17) LH L L PRECHARGE(9) LL H L NOTE: 1. This table applies when CKE n-1 was HIGH and CKE n is HIGH (Truth Table - CKE) 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: The bank has been precharged, and tRP has been met. 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 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 tRP has been met. Once tRP 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 tRP has been met. Once tRP 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. |
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