W29C020 Datasheet, PDF (7/21 Pages) Winbond – 256K X 8 CMOS FLASH MEMORY

W29C020
Command Codes for Software Chip Erase
BYTE SEQUENCE
0 Write
1 Write
2 Write
3 Write
4 Write
5 Write
ADDRESS
5555H
2AAAH
5555H
5555H
2AAAH
5555H
Software Chip Erase Acquisition Flow
Load data AA
to
address 5555
DATA
AAH
55H
80H
AAH
55H
10H
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 10
to
address 5555
Pause 50 mS
Exit
Notes for software chip erase:
Data Format: DQ7−DQ0 (Hex)
Address Format: A14−A0 (Hex)
Publication Release Date: February 1998
-7-
Revision A3