參數(shù)資料
型號: CYDD18S72V18-167BGI
廠商: CYPRESS SEMICONDUCTOR CORP
元件分類: SRAM
英文描述: 256K X 72 DUAL-PORT SRAM, 9 ns, PBGA484
封裝: 23 X 23 MM, 2.03 MM HEIGHT, 1 MM PITCH, PLASTIC, BGA-484
文件頁數(shù): 33/53頁
文件大?。?/td> 2422K
代理商: CYDD18S72V18-167BGI
FullFlex
Document #: 38-06072 Rev. *I
Page 39 of 53
Read Cycle for Flow-through Mode, DDRON = LOW
READ-to-WRITE for Pipelined Mode, DDRON = LOW (OE = VIL)[40, 41, 42]
Notes:
40. When OE = VIL, the last read operation is allowed to complete before the DQ bus is tri-stated and the user is allowed to drive write data.
41. Two dummy writes should be issued to accomplish bus turnaround. The third instruction is the first valid write.
42. Chip enable or all byte enables should be held inactive during the two dummy writes to avoid data corruption.
Switching Waveforms (continued)
tCYC
tSAC
tHAC
tCKHZ1
tDC
tOE
tOLZ
tOHZ
tDC
tCD1
tCKLZ1
An
tHAC
tSAC
CE1
CE0
C
An + 1
An + 3
An + 2
DQn
DQn + 1
DQn + 2
R/W
OE
BEn
A
DQ
C
A
Ax
An
An+1
An+2
tCYC
DQx-2
DQx-1
DQx
DQn
DQn+1
DQn+2
tCH
tCL
tSAC tHAC
tDC
tCD2
tCKHZ2
tSD tHD
R/W
DQ
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