參數(shù)資料
型號: V58C2256324SAH-40
廠商: PROMOS TECHNOLOGIES INC
元件分類: DRAM
英文描述: 8M X 32 DDR DRAM, 0.6 ns, PBGA144
封裝: LEAD FREE, BGA-144
文件頁數(shù): 3/37頁
文件大?。?/td> 557K
代理商: V58C2256324SAH-40
11
V58C2256324SA Rev. 1.0 November 2003
ProMOS TECHNOLOGIES
V58C2256324SA
BankActivationCommand(ACT)
TheBankActivationcommandisinitiatedbyissuinganACTcommandattherisingedgeoftheclock.TheDDRSDRAMhasfour
independentbankswhichareselectedbythetwoBankselectAddresses(BA0,BA1).TheBankActivationcommandmustbeapplied
beforeanyReadorWriteoperationcanbeexecuted.ThedelayfromtheBankActivationcommandtothefirstreadorwritecommand
mustmeetorexceedtheminimumofRAStoCASdelaytime(tRCDRDmin.forreadcommandsandtRCDWRmin.forwritecommands).
Onceabankhasbeenactivated,itmustbeprechargedbeforeanotherBankActivatecommandcanbeappliedtothesamebank.The
minimumtimeintervalbetweeninterleavedBankActivatecommands(BankAtoBankBandviceversa)istheBanktoBankactivation
delaytime(tRRDmin).
ActivatetoReadorWriteCommandTiming(onebank)
ActivateBankAtoActivateBankBTiming
Clk
Command
tRCDWRforwrite
BankA
ACT
tRCDRDforread
tRC
Addresses
RowAdd.
READ
WRITE
or
BankA
Col.Add.
BankA
PRE
NOP
ACT
BankA
RowAdd.
Clk
Command
BankA
ACT
tRRD
Addresses
RowAdd.
NOP
ACT
BankB
RowAdd.
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