EM42AM1684RTC
1. Command Truth Table
CKE
n-
BA0,
Command
Symbol
/CS /RAS /CAS /WE
A10
A12~A0
BA1
N
1
H
H
H
H
Ignore Command
No Operation
Burst Stop
DESL
NOP
BSTH
READ
READ
A
X
X
X
X
H
L
L
L
X
H
H
H
X
H
H
L
X
H
L
X
X
X
V
X
X
X
L
X
X
X
V
Read
H
Read with Auto
Pre-charge
Write
H
H
H
H
H
X
X
X
X
X
L
L
L
L
L
H
H
H
L
L
L
H
L
V
V
V
V
V
H
L
V
V
V
V
X
WRIT
Write with Auto
Pre-charge
Bank Activate
Pre-charge Select
Bank
WRITA
ACT
L
L
H
V
L
H
H
H
L
PRE
L
Pre-charge All
Banks
PALL
H
X
L
L
H
L
X
H
X
Mode Register Set
Extended MRS
MRS
H
H
X
X
L
L
L
L
L
L
L
L
OP Code
OP Code
EMRS
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
H
L
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
SELF
-
-
-
-
H
H
L
L
H
X
X
H
X
X
Self Refresh Self Refresh Exit
L
H
X
Idle
Power Down Entry
Power Down Exit
H
Power
Down
L
H
X
X
X
X
X
H = High level, L = Low level, X = High or Low level (Don't care)
Sep. 2010
www.eorex.com
11/21
EOREX [ EOREX CORPORATION ]
