W49F020 Datasheet, PDF (9/21 Pages) Winbond – 256K X 8 CMOS FLASH MEMORY

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