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AS4C256M16D3 PDF预览

AS4C256M16D3

更新时间: 2022-02-26 12:04:06
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ALSC /
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83页 2083K
描述
Bidirectional differential data strobe

AS4C256M16D3 数据手册

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AS4C256M16D3  
Operation Mode Truth Table  
Table 3. Truth Table (Note (1), (2))  
(3)  
CKEn-1 CKEn DM BA0-2 A10/AP A0-9, 11, 13-14 A12/BC# CS# RAS# CAS# WE#  
Command  
State  
Idle(4)  
BankActivate  
H
H
H
H
H
H
H
H
H
H
H
H
X
X
X
X
X
X
V
V
V
V
V
V
Row address  
L
L
L
L
L
L
L
L
H
H
H
L
H
L
L
L
L
L
Single Bank Precharge  
All Banks Precharge  
Any  
L
H
L
L
L
V
V
V
V
V
V
V
V
L
Any  
L
Write (Fixed BL8 or BC4)  
Write (BC4, on the fly)  
Write (BL8, on the fly)  
Active(4)  
Active(4)  
Active(4)  
H
H
H
L
H
L
Write with Autoprecharge  
(Fixed BL8 or BC4)  
Active(4)  
Active(4)  
Active(4)  
H
H
H
H
H
H
X
X
X
V
V
V
H
H
H
V
V
V
V
L
L
L
L
H
H
H
L
L
L
L
L
L
Write with Autoprecharge  
(BC4, on the fly)  
Write with Autoprecharge  
(BL8, on the fly)  
H
Read (Fixed BL8 or BC4)  
Active(4)  
Active(4)  
Active(4)  
H
H
H
H
H
H
X
X
X
V
V
V
L
L
L
V
V
V
V
L
L
L
L
H
H
H
L
L
L
H
H
H
Read (BC4, on the fly)  
Read (BL8, on the fly)  
H
Read with Autoprecharge  
(Fixed BL8 or BC4)  
Active(4)  
Active(4)  
Active(4)  
H
H
H
H
H
H
X
X
X
V
V
V
H
H
H
V
V
V
V
L
L
L
L
H
H
H
L
L
L
H
H
H
Read with Autoprecharge  
(BC4, on the fly)  
Read with Autoprecharge  
(BL8, on the fly)  
H
(Extended) Mode Register Set  
No-Operation  
Idle  
Any  
H
H
H
H
H
H
H
H
H
X
H
L
X
X
X
X
X
X
V
V
X
X
V
V
X
V
X
V
X
V
X
X
X
X
OP code  
L
L
L
H
X
H
L
L
H
X
H
L
L
H
X
L
V
X
X
V
V
X
V
X
V
X
V
X
X
H
L
V
X
X
V
V
X
V
X
V
X
V
X
X
X
X
V
X
X
V
V
X
V
X
V
X
V
X
X
X
X
Device Deselect  
Burst Stop  
Any  
H
L
Active(5)  
Idle  
Refresh  
L
H
H
X
H
X
H
X
H
X
X
L
SelfRefresh Entry  
Idle  
L
L
L
H
L
X
H
X
H
X
H
X
X
H
H
X
H
X
H
X
H
X
X
H
H
SelfRefresh Exit  
Idle  
Idle  
Any  
L
H
L
H
L
X
X
X
H
L
Power Down Mode Entry  
Power Down Mode Exit  
H
L
H
Data Input Mask Disable  
Data Input Mask Enable(6)  
ZQ Calibration Long  
Active  
Active  
Idle  
H
H
H
H
X
X
H
H
L
H
X
X
X
X
L
ZQ Calibration Short  
Idle  
L
L
NOTE 1: V=Valid data, X=Don't Care, L=Low level, H=High level  
NOTE 2: CKEn signal is input level when commands are provided.  
NOTE 3: CKEn-1 signal is input level one clock cycle before the commands are provided.  
NOTE 4: These are states of bank designated by BA signal.  
NOTE 5: Device state is 4, and 8 burst operation.  
NOTE 6: LDM and UDM can be enabled respectively.  
Confidential  
8
Rev. 3.0  
Aug. /2014  

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