eorex
EM42BM3284LBA
1. Command Truth Table
CKE
n-1
BA0,
BA1
Command
Symbol
/CS /RAS /CAS /WE
A10 A12~A0
n
X
X
X
X
X
X
X
X
X
X
X
Ignore Command
No Operation
Burst Stop
DESL
NOP
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
X
H
H
H
H
H
L
X
H
H
L
X
H
L
X
X
X
X
L
X
X
X
V
V
V
V
V
X
X
V
X
BSTH
READ
X
Read
H
H
L
V
Read with Auto Pre-charge READA
Write WRIT
Write with Auto Pre-charge WRITA
L
V
H
L
L
V
H
H
H
H
L
H
H
L
V
H
V
L
Bank Activate
ACT
PRE
PALL
MRS
L
V
Pre-charge Select Bank
Pre-charge All Banks
Mode Register Set
L
V
L
L
X
H
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
CKE
Item
Command
Symbol
/CS /RAS /CAS /WE Addr.
n-1
H
n
H
L
Idle
Idle
CBR Refresh Command
Self Refresh Entry
REF
L
L
L
L
L
L
H
H
H
X
X
X
X
X
X
X
X
X
SELF
H
L
H
H
L
L
H
X
X
X
H
X
X
X
Self Refresh
Self Refresh Exit
L
H
L
H
X
X
Idle
Power Down Entry
Power Down Exit
Power Down
H
Remark H = High level, L = Low level, X = High or Low level (Don't care)
Feb. 2009
www.eorex.com
12/24
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