D4564163G5 데이터 시트보기 (PDF) - Elpida Memory, Inc

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D4564163G5

64M-bit Synchronous DRAM 4-bank, LVTTL

Elpida Memory, Inc 

µPD4564441, 4564841, 4564163

4. Truth Table

4.1 Command Truth Table

Function

Device deselect

No operation

Burst stop

Read

Read with auto precharge

Write

Write with auto precharge

Bank activate

Precharge select bank

Precharge all banks

Mode register set

Symbol

DESL

NOP

BST

READ

READA

WRIT

WRITA

ACT

PRE

PALL

MRS

CKE

n–1

n

H

×

H

×

H

×

H

×

H

×

H

×

H

×

H

×

H

×

H

×

H

×

/CS /RAS /CAS /WE A12,

A13

H

×

×

×

×

L

H

H

H

×

L

H

H

L

×

L

H

L

H

V

L

H

L

H

V

L

H

L

L

V

L

H

L

L

V

L

L

H

H

V

L

L

H

L

V

L

L

H

L

×

L

L

L

L

L

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

A10 A11,

A9 - A0

×

×

×

×

×

×

L

V

H

V

L

V

H

V

V

V

L

×

H

×

L

V

4.2 DQM Truth Table

Function

Symbol

CKE

n–1

n

DQM

U

L

Data write / output enable

ENB

H

×

L

Data mask / output disable

MASK

H

×

H

Upper byte write enable / output enable

ENBU

H

×

L

×

Lower byte write enable / output enable

ENBL

H

×

×

L

Upper byte write inhibit / output disable

MASKU

H

×

H

×

Lower byte write inhibit / output disable

MASKL

H

×

×

H

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

4.3 CKE Truth Table

Current state

Function

Symbol

CKE

n–1

n

/CS /RAS /CAS /WE Address

Activating

Any

Clock suspend mode entry

Clock suspend mode

H

L

×

×

×

×

×

L

L

×

×

×

×

×

Clock suspend

Idle

Idle

Self refresh

Clock suspend mode exit

CBR (auto) refresh command

Self refresh entry

Self refresh exit

REF

SELF

Idle

Power down

Power down entry

Power down exit

L

H

×

×

×

×

×

H

H

L

L

L

H

×

H

L

L

L

L

H

×

L

H

L

H

H

H

×

L

H

H

×

×

×

×

H

L

×

×

×

×

×

L

H

H

×

×

×

×

L

H

L

H

H

H

×

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

Data Sheet E0149N10

15

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