參數(shù)資料
型號(hào): μPD4516821A
廠商: NEC Corp.
英文描述: 16M-bit Synchronous DRAM(16M 同步動(dòng)態(tài)RAM)
中文描述: 1,600位同步DRAM(1,600同步動(dòng)態(tài)RAM)的
文件頁(yè)數(shù): 28/86頁(yè)
文件大?。?/td> 904K
代理商: ΜPD4516821A
μ
PD4516421A, 4516821A, 4516161A for Rev. P
28
10.2 Write with Auto Precharge
During a write cycle, the auto precharge begins one clock after the last data word input to the device (CAS latency
of 2 or 3).
DB1
DB2
DB3
DB4
Auto precharge starts
WRITA B
Hi-Z
DB1
DB2
DB3
DB4
Auto precharge starts
WRITA B
Hi-Z
DQ
Command
DQ
Command
CAS latency = 2
CAS latency = 3
CLK
T0
T2
T1
T3
T4
T5
T6
T7
T8
Burst length = 4
(t
RAS
must be satisfied)
Remark
WRITA means Write with Auto precharge
In summary, the auto precharge cycle begins relative to a reference clock that indicates the last data word is valid.
In the table below, minus means clocks before the reference; plus means clocks after the reference.
CAS latency
Read
Write
2
–1
+1
3
–2
+1
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