W29C040
Command Codes for Software Chip Erase
BYTE SEQUENCE
ADDRESS
0 Write
5555H
1 Write
2AAAH
2 Write
5555H
3 Write
5555H
4 Write
2AAAH
5 Write
5555H
Software Chip Erase 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 10
to
address 5555
Wait for 50 mS or
toggle/polling
completed
Exit
Notes for software chip erase:
Data Format: DQ7 − DQ0 (Hex)
Address Format: A14 − A0 (Hex)
-7-
DATA
AAH
55H
80H
AAH
55H
10H
Publication Release Date: May 6, 2002
Revision A9