MSM548262-70JS datasheet(29/37 Pages) OKI

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¡ Semiconductor

MSM548262

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OPERATION MODES

Table-1 shows the function truth table for a listing of all available RAM ports, and transfer

operation of MSM548262.

The RAM port and data transfer operations are determined by the state of CAS, TRG, WE and

DSF at the falling edge of RAS, and by the level of DSF at the falling edge of CAS.

Table-1. Function Truth Table

RASØ

Code

Address

CAS TRG WE DSF DSF

RASØ

CAS

Write

Mask

Color

0***

—

****

—

CBR

CASØ

WEØ

RASØ

W/IO

CASØ

Function

CBR Refresh

11*0

—

Row

—

ROR

RAS Only Refresh

1000*

Row TAP WM1

Yes

—

MWT

Masked Write Transfer

1001*

Row TAP WM1

Yes

—

MSWT

Masked Split

Write Transfer

1010*

Row TAP

—

Read Transfer

1011*

Row TAP

—

SRT

Split Read Transfer

11000

Row Column WM1 Din,Dout

Yes

—

RWM

Read/Write

(Mask)

11001

Row

Column

WM1

Yes

Use

BWM

Masked Block Write

1101*

Row

WM1

—

Yes

Use

FWM

Masked Flash Write

11100

Row Column

Din,Dout

—

Read/Write

(No Mask)

11101

Row

Use

Block Write

(No Mask)

11111

Row

—

Load

LCR

Load Color Register

A2c - 8c

Column

A2c - 8c

Column

Select

Column

Select

Color

Data

If the DSF is "high" at the falling edge of RAS, special functions such as split transfer, flash write,

load color register can be invoked.

If the DSF is "low" at the falling edge of RAS and "high" at the falling edge of CAS, the block write

feature can be invoked.

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