EDS1232CASE Datasheet, PDF (15/53 Pages) Elpida Memory – 128M bits SDRAM (4M words x 32 bits)

EDS1232CASE
Truth Table
Command Truth Table
CKE
Function
Symbol
n–1 n
Device deselect
DESL
H
×
No operation
NOP
H
×
Burst stop
BST
H
×
Read
READ
H
×
Read with auto precharge
READA
H
×
Write
Write with auto precharge
WRIT
WRITA
H
×
H
×
Bank activate
ACT
H
×
Precharge select bank
Precharge all banks
PRE
PALL
H
×
H
×
Mode register set
MRS
H
×
Remark: H: VIH. L: VIL. ×: VIH or VIL, V = Valid data
DQM Truth Table
Function
Symbol
Data write / output enable
ENB
Data mask / output disable
MASK
DQ0 to DQ7 write enable/output enable
ENB0
DQ8 to DQ15 write enable/output enable
ENB1
DQ16 to DQ23 write enable/output enable ENB2
DQ24 to DQ31 write enable/output enable ENB3
DQ0 to DQ7 write inhibit/output disable
MASK0
DQ8 to DQ15 write inhibit/output disable
MASK 1
DQ16 to DQ23 write inhibit/output disable
MASK 2
DQ24 to DQ31 write inhibit/output disable
MASK 3
Remark: H: VIH. L: VIL. ×: VIH or VIL
/CS
H
L
L
L
L
L
L
L
L
L
L
CKE
n–1
H
H
H
H
H
H
H
H
H
H
/RAS /CAS /WE
×
×
×
H
H
H
H
H
L
H
L
H
H
L
H
H
L
L
H
L
L
L
H
H
L
H
L
L
H
L
L
L
L
DQM
n
0
1
×
L
L
×
H
H
×
L
×
×
×
L
×
×
×
×
×
×
×
H
×
×
×
H
×
×
×
×
×
×
BA0,
BA1 A10
×
×
×
×
×
×
V
L
V
H
V
L
V
H
V
V
V
L
×
H
L
L
A9 - A0,
A11
×
×
×
V
V
V
V
V
×
×
V
2
3
L
L
H
H
×
×
×
×
L
×
×
L
×
×
×
×
H
×
×
H
Data Sheet E0351E30 (Ver. 3.0)
15