Rainbow Electronics W49F020 - Manual (Page 9)

Preliminary W49F020
Publication Release Date: October 1999
- 9 - Revision A1
Command Codes for Boot Block Lockout Enable
BYTE SEQUENCE BOOT BLOCK LOCKOUT FEATURE SET
ADDRESS DATA
1 Write 5555H AAH
2 Write 2AAAH 55H
3 Write 5555H 80H
4 Write 5555H AAH
5 Write 2AAAH 55H
6 Write 5555H 40H
Pause 1 Sec.
Boot Block Lockout Enable Acquisition Flow
Boot Block Lockout
Feature Set 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 1 Sec.
Exit
Notes for boot block lockout enable:
Data Format: DQ7
− DQ0 (Hex)
Address Format: A14 − A0 (Hex)