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EM42BM3284LBA_09 参数 Datasheet PDF下载

EM42BM3284LBA_09图片预览
型号: EM42BM3284LBA_09
PDF下载: 下载PDF文件 查看货源
内容描述: 1GB ( 8M × 4Bank × 32 ),双倍数据速率SDRAM [1Gb (8M×4Bank×32) Double DATA RATE SDRAM]
分类和应用: 动态存储器双倍数据速率
文件页数/大小: 24 页 / 1075 K
品牌: EOREX [ EOREX CORPORATION ]
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eorex  
EM42BM3284LBA  
4. Command Truth Table for CKE  
CKE  
n-1  
Current State  
/CS /R /C /W  
Addr.  
Action  
n
X
H
H
H
H
H
L
H
L
L
L
L
L
L
H
L
L
L
L
L
L
H
X
H
L
L
L
X
X
H
H
H
L
X
X
X
H
H
H
L
X
X
H
H
L
X
X
X
X
H
H
L
X
X
H
L
X
X
X
X
X
H
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
INVALID  
Exist Self-Refresh  
Exist Self-Refresh  
ILLEGAL  
Self Refresh  
ILLEGAL  
ILLEGAL  
L
X
X
H
L
L
L
NOP(Maintain self refresh)  
INVALID  
Exist Power down  
Exist Power down  
ILLEGAL  
X
H
H
H
H
H
L
Both bank  
precharge  
power down  
ILLEGAL  
ILLEGAL  
L
X
X
X
X
X
X
H
X
X
X
NOP(Maintain Power down)  
Refer to function true table  
H
Enter power down mode(Note 3)  
H
L
L
Enter power down mode(Note 3)  
ILLEGAL  
H
H
H
H
H
H
L
L
L
L
L
L
H
H
H
L
H
H
L
H
L
H
L
X
H
H
L
X
X
X
RA  
X
L
L
L
L
ILLEGAL  
All Banks  
Idle  
Row active/Bank active  
Enter self-refresh(Note 3)  
L
L
L
L
L
Op-Code Mode register access  
H
L
L
L
L
L
Op-Code Special mode register access  
X
H
X
X
X
X
X
X
Refer to current state  
Any State Other  
than Listed above  
H
X
X
X
X
Refer to command truth table  
Remark: H = High level, L = Low level, X = High or Low level (Don't care)  
Notes 1: After CKE’s low to high transition to exist self refresh mode.And a time of tRC(min) has to be  
Elapse after CKE’s low to high transition to issue a new command.  
Notes 2:CKE low to high transition is asynchronous as if restarts internal clock.  
Notes 3:Power down and self refresh can be entered only from the idle state of all banks.  
Feb. 2009  
www.eorex.com  
16/24  
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