AK6420AM 参数 Datasheet PDF下载

ASAHI KASEI

[AK6420A/40A/80A]

Functional Description

The AK6420A/40A/80A has 4 instructions such as READ, WRITE, WREN (write enable) and WRDS (write

disable). Each instruction is organized by op-code block (8bits), address block (8bits) and data (8bits

×

2).

When input level of SK pin is high level and input level of chip select (CS) pin is changed from high level to low

level, AK6420A/40A/80A can receive the instructions.

When the instructions are executed consecutively, the CS pin should be brought to high level for a minimum of

250ns(Tcs) between consecutive instruction cycle.

„

Instruction Set For 6420A

Instruction

READ

WRITE

WREN

WRDS

( WRAL )

Op-Code

10101000

10100100

10100011

10100000

10101111

Address

A6 A5 A4 A3 A2 A1 A0 0

A6 A5 A4 A3 A2 A1 A0 0

�½ �½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ

�½ �½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ

�½ �½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ

Data

D15 -D0

D15 -D0

D15 -D0

„

Instruction Set For 6440A

Instruction

READ

WRITE

WREN

WRDS

( WRAL )

Op-Code

10101000

10100100

10100011

10100000

10101111

Address

A7 A6 A5 A4 A3 A2 A1 A0

A7 A6 A5 A4 A3 A2 A1 A0

�½ �½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ

�½ �½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ

�½ �½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ

Data

D15 -D0

D15 -D0

D15 -D0

„

Instruction Set For 6480A

Instruction

READ

WRITE

WREN

WRDS

( WRAL )

Op-Code

1 0 1 0 1 0 0 A8

1 0 1 0 0 1 0 A8

10100011

10100000

10101111

Address

A7 A6 A5 A4 A3 A2 A1 A0

A7 A6 A5 A4 A3 A2 A1 A0

�½ �½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ

�½ �½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ

�½ �½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ�½ �½ Õ

Data

D15 -D0

D15 -D0

D15 -D0

Õ:don't

care

(Note) The WRAL instruction is used for factory function test only. User can't use this instruction .

DAS01E-00

-5-

1999/05