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IS42S32800B-6B Datasheet(PDF) 7 Page - Integrated Silicon Solution, Inc |
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IS42S32800B-6B Datasheet(HTML) 7 Page - Integrated Silicon Solution, Inc |
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7 / 62 page  Integrated Silicon Solution, Inc. — 1-800-379-4774 7 Rev. B 05/24/06 ISSI® IS42S32800B Commands 1 BankActivate (RAS#=”L”,CAS#=”H”,WE#=”H”,BS =Bank,A0-A11 =Row Address) The BankActivate command activates the idle bank designated by the BS0,1 (Bank Select) signal.By latching the row address on A0 to A11 at the time of this command,the selected row access is initiated.The read or write operation in the same bank can occur after a time delay of tRCD(min.)from the time of bank activation.A subsequent BankActivate command to a different row in the same bank can only be issued after the previous active row has been precharged (refer to the following figure).The minimum time interval between successive BankActivate commands to the same bank is defined by tRC(min.).The SDRAM has four internal banks on the same chip and shares part of the internal circuitry to reduce chip area;therefore it restricts the back-to-back activation of the four banks.tRRD(min.)specifies the minimum time required between activating different banks. After this command is used,the Write command and the Block Write command perform the no mask write operation. CLK ADDRESS T0 T1 T2 T3 Tn+3 Tn+4 Tn+5 Tn+6 .............. COMMAND .............. .............. NOP NOP NOP NOP RAS# - CAS# delay ( tRCD) RAS#- RAS# delay time ( tRRD) RAS# Cycle time ( tRC) Bank A Row Addr. Bank A Col Addr. Bank B Row Addr. Bank A Row Addr. Bank A Activate R/W A with AutoPrecharge Bank B Activate Bank A Activate Auto Precharge Begin :"H" or "L" Bank 2 BankPrecharge command (RAS#=”L”,CAS#=”H”,WE#=”L”,BS =Bank,A10 =”L”) The BankPrecharge command precharges the bank disignated by BS0,1 signal.The precharged bank is switched from the active state to the idle state.This command can be asserted anytime after tRAS(min.)is satisfied from the BankActivate command in the desired bank.The maximum time any bank can be active is specified by tRAS(max.).Therefore,the precharge function must be performed in any active bank within tRAS(max.).At the end of precharge,the precharged bank is still in the idle state and is ready to be activated again. |
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