EDS2508APSA-75 データシートの表示（PDF） - Elpida Memory, Inc

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EDS2508APSA-75

256M bits SDRAM

Elpida Memory, Inc 

EDS2508APSA, EDS2516APSA

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

L H L HH× ×

Self refresh recovery

L H L HL × ×

ILLEGAL

LHLL×××

ILLEGAL

LL ×××××

Continue self refresh

Self refresh recovery H H H × × × ×

Idle after tRC

HH L HH× ×

Idle after tRC

HH L HL × ×

ILLEGAL

HH L L × × ×

ILLEGAL

HL H× × × ×

ILLEGAL

HL L HH× ×

ILLEGAL

HL L HL × ×

ILLEGAL

HL L L × × ×

ILLEGAL

Power down

H× × × × ×

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

HH 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

HL H× × ×

Begin power down next cycle

HL L H× ×

Refer to operations in Function Truth Table

HL 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

LL ×××××

Power down

1

Row active

H× × × × × ×

Refer to operations in Function Truth Table

L× ×××××

Clock suspend

1

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

LL ×××××

Maintain clock suspend

Remark: H: VIH. L: VIL. ×: VIH or VIL

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.

Data Sheet E0228E30 (Ver. 3.0)

21

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