M2V56S20AKT View Datasheet(PDF) - Mitsumi

Part Name

Description

Manufacturer

M2V56S20AKT

256M Synchronous DRAM

Mitsumi 

SDRAM (Rev.1.01)

Single Data Rate

July '01

MITSUBISHI LSIs

M2V56S20/ 30/ 40 AKT -5, -6, -7

256M Synchronous DRAM

CLK SUSPEND and POWER DOWN

CKE controls the internal CLK at the following cycle. Figure below shows how CKE works. By

negating CKE, the next internal CLK is suspended. The purpose of CLK suspend is power down, output

suspend or input suspend. CKE is a synchronous input except during the self-refresh mode. CLK

suspend can be performed either when the banks are active or idle. A command at the suspended cycle is

ignored.

ext.CLK

CKE

tIH tIS tIH tIS

int.CLK

CLK

CKE

Command

Power Down by CKE

PRE NOP NOP NOP

Standby Power Down

CKE

Command

ACT NOP NOP NOP

Active Power Down

CLK

CKE

Command

Write

DQ

D0 D1

DQ Suspend by CKE

D2 D3

Read

Q0 Q1

Q2

Q3

MITSUBISHI ELECTRIC

27

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