eorex
Output Drive Strength
Preliminary
EM48AM1644LBB
The normal drive strength got all outputs is specified to be LV-CMOS. By setting EMRS specific parameter
on A6 and A5, driving capability of data output drivers is selected.
Partial Array Self Refresh
In EMRS setting ,memory array size to be refreshed during self-refresh operation is programmable in order
to reduce power. Data outside the defined area will not be retained during self-refresh.
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
/RAS
X
H
H
H
H
H
L
L
L
L
/CAS
X
H
H
L
L
L
H
H
H
H
/WE
X
H
L
H
H
L
H
H
L
L
BA0,
BA1
X
X
X
V
V
V
V
V
V
X
A10
X
X
X
L
H
L
H
V
L
H
L
A11,
A9~A10
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
Jul. 2006
13/19
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