eorex
EM44AM1684LBC
1. Command Truth Table
CKE
n-1
BA0,
BA1
Command
Symbol
/CS /RAS /CAS /WE
A10 A12~A0
n
Ignore Command
No Operation
DESL
NOP
H
H
H
H
H
H
H
H
H
H
X
X
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
X
H
H
H
H
H
L
X
H
L
X
H
H
H
L
X
X
V
V
V
V
V
V
X
V
X
X
L
X
X
V
V
V
V
V
X
X
V
Read
READ
READA
WRIT
WRITA
ACT
Read with Auto Pre-charge
Write
L
H
L
L
Write with Auto Pre-charge
Bank Activate
L
L
H
V
L
H
H
H
L
H
L
Pre-charge Select Bank
Pre-charge All Banks
(Ext.) Mode Register Set
PRE
L
PALL
L
L
H
V
(E)MRS
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
H
X
H
X
X
X
X
X
X
X
X
SELF
H
L
H
H
L
L
H
X
X
H
X
H
H
X
X
H
X
H
Self Refresh
Idle
Self Refresh Exit
Power Down Entry
Power Down Exit
L
H
H
L
H
H
L
L
H
H
H
L
Power Down
L
Remark H = High level, L = Low level, X = High or Low level (Don't care)
Jul. 2006
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14/29
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