UPD45128441G5-A80-9J 查看數據表（PDF） - Elpida Memory, Inc

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UPD45128441G5-A80-9J

128M-bit Synchronous DRAM 4-bank, LVTTL

Elpida Memory, Inc 

µPD45128441, 45128841, 45128163

4.5 Command Truth Table for CKE

Current State

CKE /CS /RAS /CAS /WE Address

Action

Notes

n–1 n

Self refresh

H × × × × ××

INVALID, CLK (n – 1) would exit self refresh

L H H × × ××

Self refresh recovery

L H L H H ××

Self refresh recovery

L H L H L ××

ILLEGAL

L H L L × ××

ILLEGAL

L L × × × ××

Maintain self refresh

Self refresh recovery H H H × × × ×

Idle after tRC

H H L H H ××

Idle after tRC

H H L H L ××

ILLEGAL

H H L L × ××

ILLEGAL

H L H × × ××

ILLEGAL

H L L H H ××

ILLEGAL

H L L H L ××

ILLEGAL

H L L L × ××

ILLEGAL

Power down

H×××× ×

INVALID, CLK (n – 1) would exit power down

L H H × × ××

EXIT power down → Idle

L H L H H H×

EXIT power down → Idle

L L × × × ××

Maintain power down mode

All banks idle

HHH × × ×

Refer to operations in Operative Command Table

HHLH× ×

Refer to operations in Operative Command Table

HHL LH×

Refer to operations in Operative Command Table

H H L L L H×

CBR (auto) Refresh

H H L L L L Op-Code Refer to operations in Operative Command Table

HLH×× ×

Refer to operations in Operative Command Table

HLLH× ×

Refer to operations in Operative Command Table

HL L LH×

Refer to operations in Operative Command Table

H L L L L H×

Self refresh

1

H L L L L L Op-Code Refer to operations in Operative Command Table

L × × × × ××

Power down

1

Row active

H × × × × ××

Refer to operations in Operative Command Table

L × × × × ××

Power down

1

Any state other than H H × × × ×

Refer to operations in Operative Command Table

listed above

H L × × × ××

Begin clock suspend next cycle

2

L H × × × ××

Exit clock suspend next cycle

L L × × × ××

Maintain clock suspend

Notes 1. Self refresh can be entered only from the all banks idle state. Power down can be entered only from all

banks idle or row active state.

2. Must be legal command as defined in Operative Command Table.

Remark H = High level, L = Low level, × = High or Low level (Don't care)

Data Sheet E0031N30

19

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