GPR27P01GA

© Generalplus Technology Inc.

Proprietary & Confidential

5

Dec. 21, 2009

Version: 1.4

4. FUNCTIONAL DESCRIPTIONS

4.1. Operation Modes

Command input, address input, and serial read are all performed from I/O pins, and the respective statuses are controlled by the CLE, ALE,

WE, RE, and CE signals.

4.2. Operation Mode

Mode

CLE

ALE

CE

WE

RE

Command input cycle

H

L

L

H

Address input cycle

L

H

L

H

Serial read cycle

L

L

L

H

4.3. Operation Mode during Serial Read

Mode

CLE

ALE

CE

WE

RE

I/O0 - I/O7

Data output

L

L

L

H

L

Data output

Output Hi-Z

L

L

L

H

H

Hi-Z

Remark ´ : VIH or VIL