參數(shù)資料
型號: μPD4564323
廠商: NEC Corp.
英文描述: 64M-bit Synchronous DRAM(64M 同步動態(tài)RAM)
中文描述: 6400位同步DRAM(6400同步動態(tài)RAM)的
文件頁數(shù): 31/82頁
文件大?。?/td> 659K
代理商: ΜPD4564323
31
μ
PD4564323
Preliminary Data Sheet
12.2.2 Precharge Termination in WRITE Cycle
During a write cycle, the burst write operation is terminated by a precharge command.
When the precharge command is issued, the burst write operation is terminated and precharge starts.
The same bank can be activated again after t
RP
from the precharge command.
To issue a precharge command, t
RAS
must be satisfied.
When /CAS latency is 2, the write data written prior to the precharge command will be correctly stored. However,
invalid data may be written at the same clock as the precharge command. To prevent this from happening, DQM
must be high at the same clock as the precharge command. This will mask the invalid data.
Write
CLK
T0
T2
T1
T3
T4
T5
T6
T7
Burst length = X, /CAS latency = 2
DQ
Command
D1
D2
D3
ACT
DQM
t
RP
PRE
Hi-Z
D4
D5
(t
RAS
must be satisfied)
When /CAS latency is 3, the write data written prior to the precharge command will be correctly stored. However,
invalid data may be written at the same clock as the precharge command. To prevent this from happening, DQM
must be high at the same clock as the precharge command. This will mask the invalid data.
Write
CLK
T0
T2
T1
T3
T4
T5
T6
T7
Burst length = X, /CAS latency = 3
DQ
Command
D1
D2
D3
ACT
DQM
t
RP
PRE
Hi-Z
D5
T8
D4
(t
RAS
must be satisfied)
相關PDF資料
PDF描述
μPD45D128164 128 M-bit Synchronous DRAM with Double Data Rate(128 同步動態(tài)RAM)
μPD45D128442 128 M-bit Synchronous DRAM with Double Data Rate(128 同步動態(tài)RAM)
μPD45D128842 128 M-bit Synchronous DRAM with Double Data Rate(128 同步動態(tài)RAM)
μPD4811650 16M Synchronous Graphics Memory (SGRAM)(16M同步圖形存儲器)
μPD703002 16/32 Bit Single Chip Microcontrollers(16/32 位單片微控制器)
相關代理商/技術參數(shù)
參數(shù)描述
PD-45A 功能描述:線性和開關式電源 40W 5V/3.2A 12V/2A RoHS:否 制造商:TDK-Lambda 產品:Switching Supplies 開放式框架/封閉式:Enclosed 輸出功率額定值:800 W 輸入電壓:85 VAC to 265 VAC 輸出端數(shù)量:1 輸出電壓(通道 1):20 V 輸出電流(通道 1):40 A 商用/醫(yī)用: 輸出電壓(通道 2): 輸出電流(通道 2): 安裝風格:Rack 長度: 寬度: 高度:
PD-45B 功能描述:線性和開關式電源 44.8W 5V/3.2A 24V/1.2A RoHS:否 制造商:TDK-Lambda 產品:Switching Supplies 開放式框架/封閉式:Enclosed 輸出功率額定值:800 W 輸入電壓:85 VAC to 265 VAC 輸出端數(shù)量:1 輸出電壓(通道 1):20 V 輸出電流(通道 1):40 A 商用/醫(yī)用: 輸出電壓(通道 2): 輸出電流(通道 2): 安裝風格:Rack 長度: 寬度: 高度:
PD45VN6C100 制造商:Banner Engineering 功能描述:SENSOR, PHOTOELECTRIC, PICODOT, CONVERGENT LASER, FOCAL POINT, 1
PD45VN6C100Q 制造商:Banner Engineering 功能描述:Sensor, PicoDot, Convergent Laser, Focal Point: 102mm, Input 10-30VDC, Cable 2m
PD45VN6C200 制造商:Banner Engineering 功能描述:PicoDot: Convergent Laser, Focal Point: 203 mm, Input: 10-30V dc, Outputs: Compl