W29C020 Datasheet, PDF (9/21 Pages) Winbond – 256K X 8 CMOS FLASH MEMORY

W29C020
Command Codes for Boot Block Lockout Enable
BYTE SEQUENCE
0 Write
1 Write
2 Write
3 Write
4 Write
5 Write
6 Write
BOOT BLOCK LOCKOUT FEATURE SET
ON FIRST 8K ADDRESS BOOT BLOCK
ADDRESS
DATA
5555H
AAH
2AAAH
55H
5555H
80H
5555H
AAH
2AAAH
55H
5555H
40H
00000H
00H
Pause 10 mS
BOOT BLOCK LOCKOUT FEATURE SET
ON LAST 8K ADDRESS BOOT BLOCK
ADDRESS
DATA
5555H
AAH
2AAAH
55H
5555H
80H
5555H
AAH
2AAAH
55H
5555H
40H
3FFFFH
FFH
Pause 10 mS
Boot Block Lockout Enable Acquisition Flow
Boot Block Lockout
Feature Set on First 8K
Address Boot Block
Boot Block Lockout
Feature Set on Last 8K
Address Boot Block
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 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.
Publication Release Date: February 1998
-9-
Revision A3