EDS1232JCBH-6B Datasheet, PDF (19/50 Pages) Elpida Memory – 128M bits SDRAM

EDS1232JCBH-6B
Command Truth Table for CKE
CKE
Current State
n – 1 n /CS /RAS /CAS /WE Address Operation
Notes
Self refresh
H× × × × × ×
INVALID, CLK (n – 1) would exit self refresh
L H H× × × ×
Self refresh recovery
LHL
LHL
LHL
LL ×
Self refresh recovery H H H
E ^HHL
HH L
HH L
HL H
O_{H L L}
HL L
HL L
L ^{Power down}
H× ×
H
H
L
×
×
H
H
L
×
H
H
L
×
H
L
×
×
×
H
L
×
×
H
L
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
Self refresh recovery
ILLEGAL
ILLEGAL
Continue self refresh
Idle after tRC
Idle after tRC
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
INVALID, CLK (n – 1) would exit power down
L H H× × × ×
EXIT power down
L H L HHH×
EXIT power down
LL ×××××
Continue power down mode
All banks idle
HH H× × ×
Refer to operations in Function Truth Table
HH L H× ×
Refer to operations in Function Truth Table
P _{H H L L H ×}
Refer to operations in Function Truth Table
HH L L L H×
CBR (auto) Refresh
H H L L L L OPCODE Refer to operations in Function Truth Table
r ^{H L H × × ×}
Begin power down next cycle
HL L H× ×
Refer to operations in Function Truth Table
o ^{H L L L H ×}
Refer to operations in Function Truth Table
HL L L L H×
Self refresh
1
H L L L L L OPCODE Refer to operations in Function Truth Table
LH×××××
Exit power down next cycle
d _{L L × × × × ×}
Power down
1
Row active
H× × × × × ×
Refer to operations in Function Truth Table
L× ×××××
Clock suspend
1
u _{Any state other than H H × × × ×}
Refer to operations in Function Truth Table
listed above
HL × × × × ×
Begin clock suspend next cycle
2
LH×××××
Exit clock suspend next cycle
c ^{L L × × × × ×}
Maintain clock suspend
Remark: H: VIH. L: VIL. ×: VIH or VIL
t ^{Notes: 1. Self refresh can be entered only from the all banks idle state. Power down can be entered only from all}
banks idle. Clock suspend can be entered only from following states, row active, read, read with auto-
precharge, write and write with auto precharge.
2. Must be legal command as defined in Function Truth Table.
Preliminary Data Sheet E0748E20 (Ver. 2.0)
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