參數(shù)資料
型號: μPD45128441
廠商: NEC Corp.
英文描述: 128M-bit Synchronous DRAM(128M 同步DRAM)
中文描述: 128兆位同步DRAM(128M的同步DRAM)的
文件頁數(shù): 30/84頁
文件大小: 693K
代理商: ΜPD45128441
Preliminary Data Sheet
30
μ
PD45128441, 45128841, 45128163
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.
READ can be interrupted by WRITE. DQM must be High at least 3 clocks prior to the Write command.
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
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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