eorex
2. DQM Truth Table
Command
Data Write/Output Enable
Data Mask/Output Disable
Upper Byte Write Enable/Output Enable
Read
Read with Auto Pre-charge
Write
Write with Auto Pre-charge
Bank Activate
Pre-charge Select Bank
Pre-charge All Banks
Mode Register Set
Symbol
ENB
MASK
BSTH
READ
READA
WRIT
WRITA
ACT
PRE
PALL
MRS
EM488M1644VTB
CKE
n-1
H
H
H
H
H
H
H
H
H
H
H
n
X
X
X
X
X
X
X
X
X
X
X
/CS
H
L
L
L
L
L
L
L
L
L
L
H = High level, L = Low level, X = High or Low level (Don't care), V = Valid data input
3. CKE Truth Table
Item
Activating
Any
Clock
Suspend
Idle
Idle
Self Refresh
Idle
Power Down
Command
Clock Suspend Mode Entry
Clock Suspend Mode
Clock Suspend Mode Exit
CBR Refresh Command
Self Refresh Entry
Self Refresh Exit
Power Down Entry
Power Down Exit
REF
SELF
Symbol
CKE
n-1 n
H
L
L
L
L
H
H
L
L
H
L
H
H
L
H
H
L
H
/CS
X
X
X
L
L
L
H
X
X
/RAS
X
X
X
L
L
H
X
X
X
/CAS
X
X
X
L
L
H
X
X
X
/WE
X
X
X
H
H
H
X
X
X
Addr.
X
X
X
X
X
X
X
X
X
Remark
H = High level, L = Low level, X = High or Low level (Don't care)
Dec. 2006
12/17
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