W29C020C
Command Codes for Boot Block Lockout Enable
BYTE SEQUENCE
BOOT BLOCK LOCKOUT FEATURE SET ON
FIRST 8K ADDRESS BOOT BLOCK
ADDRESS
5555H
2AAAH
5555H
5555H
2AAAH
5555H
00000H
Pause 10
µS
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
µS
DATA
AAH
55H
80H
AAH
55H
40H
FFH
0 Write
1 Write
2 Write
3 Write
4 Write
5 Write
6 Write
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: April 2000
Revision A2