W29C020-12 参数 Datasheet PDF下载

W29C020

Command Codes for Boot Block Lockout Enable

BYTE SEQUENCE

BOOT BLOCK LOCKOUT FEATURE SET

ON FIRST 8K ADDRESS BOOT BLOCK

ADDRESS

0 Write

1 Write

2 Write

3 Write

4 Write

5 Write

6 Write

5555H

2AAAH

5555H

5555H

2AAAH

5555H

00000H

Pause 10 mS

DATA

AAH

55H

80H

AAH

55H

40H

00H

BOOT BLOCK LOCKOUT FEATURE SET

ON LAST 8K ADDRESS BOOT BLOCK

ADDRESS

5555H

2AAAH

5555H

5555H

2AAAH

5555H

3FFFFH

Pause 10 mS

DATA

AAH

55H

80H

AAH

55H

40H

FFH

Boot Block Lockout Enable Acquisition Flow

Boot Block Lockout

Feature Set on First 8K

Address Boot Block

Load data AA

to

address 5555

Boot Block Lockout

Feature Set on Last 8K

Address Boot Block

Load data AA

to

address 5555

Load data 55

to

address 2AAA

Load data 55

to

address 2AAA

Load data 80

to

address 5555

Load data 80

to

address 5555

Load data AA

to

address 5555

Load data AA

to

address 5555

Load data 55

to

address 2AAA

Load data 55

to

address 2AAA

Load data 40

to

address 5555

Load data 40

to

address 5555

Load data 00

to

address 00000

Load data FF

to

address 3FFFF

Pause 10 mS

Pause 10 mS

Notes for boot block lockout enable:

1. Data Format: DQ7−DQ0 (Hex)

2. Address Format: A14−A0 (Hex)

3. If you have any questions about this commend sequence, please contact the local distributor or Winbond Electronics Corp.

-9-

Publication Release Date: February 1998

Revision A3