參數(shù)資料
型號(hào): UPD4564323G5-A80-9JH
廠(chǎng)商: NEC Corp.
英文描述: 64M-bit Synchronous DRAM 4-bank, LVTTL
中文描述: 6400位同步DRAM 4銀行,LVTTL
文件頁(yè)數(shù): 28/84頁(yè)
文件大?。?/td> 1048K
代理商: UPD4564323G5-A80-9JH
Data Sheet M14376EJ2V0DS00
28
μ
PD4564323 for Rev.
E
11.4 Read to Write Command Interval
During a read cycle, READ can be interrupted by WRITE.
The Read and Write command interval is 1 cycle minimum. There is a restriction to avoid data conflict. The Data
bus must be Hi-Z using DQM before WRITE.
D1
D2
D3
D4
Read
DQ
Command
CLK
T0
T2
T1
T3
T4
T5
T6
T7
T8
Burst length = 4
Write
DQM
Hi-Z
1cycle
READ can be interrupted by WRITE. DQM must be High at least 3 clocks prior to the Write command.
CLK
T0
T2
T1
T3
T4
T5
T6
T7
T8
Burst length = 8
T9
Q1
Q2
Q3
Read
DQ
Command
D1
D2
D3
Write
DQM
Hi-Z is
necessary
Q1
Q2
Read
DQ
Command
D1
D2
D3
Write
DQM
Hi-Z is
necessary
/CAS latency = 2
/CAS latency = 3
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