Rainbow Electronics W29C040 - Manual (Page 9)

W29C040
Publication Release Date: May 1999
- 9 - Revision A5
Command Codes for Boot Block Lockout Enable
BYTE SEQUENCE BOOT BLOCK LOCKOUT FEATURE SET
ON FIRST 16K ADDRESS BOOT BLOCK
BOOT BLOCK LOCKOUT FEATURE SET
ON LAST 16K ADDRESS BOOT BLOCK
ADDRESS DATA ADDRESS DATA
0 Write 5555H AAH 5555H AAH
1 Write 2AAAH 55H 2AAAH 55H
2 Write 5555H 80H 5555H 80H
3 Write 5555H AAH 5555H AAH
4 Write 2AAAH 55H 2AAAH 55H
5 Write 5555H 40H 5555H 40H
6 Write 00000H 00H 3FFFFH FFH
Pause 10 mS Pause 10 mS
Boot Block Lockout Enable Acquisition Flow
Load data AA
to
address 5555
Load data 55
to
address 2AAA
Load data 80
to
address 5555
Load data AA
to
address 5555
Load data 55
to
address 2AAA
Load data 40
to
address 5555
Pause 10 mS
Load data 00
to
address 00000
Boot Block Lockout
Feature Set on First 16K
Address Boot Block Boot Block Lockout
Feature Set on Last 16K
Address Boot Block
Load data AA
to
address 5555
Load data 55
to
address 2AAA
Load data 80
to
address 5555
Load data AA
to
address 5555
Load data 55
to
address 2AAA
Load data 40
to
address 5555
Pause 10 mS
Load data FF
to
address 3FFFF
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 command sequence, please contact the local distributor or Winbond Electronics Corp.