eorex
1. Command Truth Table
Command
Ignore Command
No Operation
Burst Stop
Read
Read with Auto Pre-charge
Write
Write with Auto Pre-charge
Bank Activate
Pre-charge Select Bank
Pre-charge All Banks
Symbol
DESL
NOP
BSTH
READ
READA
WRIT
WRITA
ACT
PRE
PALL
CKE
n-1 n
H X
H
H
H
H
H
H
H
H
H
X
X
X
X
X
X
X
X
X
/CS
H
L
L
L
L
L
L
L
L
L
X
H
H
H
H
H
L
L
L
L
EM42AM3284LBA
BA0,
BA1
X
X
X
V
V
V
V
V
V
X
/RAS
/CAS
X
H
H
L
L
L
H
H
H
H
/WE
X
H
L
H
H
L
H
H
L
L
A10
X
X
X
L
H
L
H
V
L
H
L
A12~A0
X
X
X
V
V
V
V
V
X
X
V
Mode Register Set
MRS
H X
L
L
L
L
L
H = High level, L = Low level, X = High or Low level (Don't care), V = Valid data input
2. CKE Truth Table
Item
Idle
Idle
Self Refresh
Idle
Command
CBR Refresh Command
Self Refresh Entry
Self Refresh Exit
Power Down Entry
Symbol
REF
SELF
CKE
n-1 n
H H
H
L
L
H
L
H
H
L
/CS
L
L
L
H
X
/RAS
L
L
H
X
X
X
/CAS
L
L
H
X
X
X
/WE
H
H
H
X
X
X
Addr.
X
X
X
X
X
X
Power Down
Power Down Exit
L
H
X
Remark
H = High level, L = Low level, X = High or Low level (Don't care)
Jul. 2006
10/20
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