W29C020C
Command Codes for Software Data Protection
BYTE SEQUENCE
0 Write
1 Write
2 Write
3 Write
4 Write
5 Write
-
-
-
TO ENABLE PROTECTION
ADDRESS
5555H
2AAAH
5555H
-
-
-
DATA
AAH
55H
A0H
TO DISABLE PROTECTION
ADDRESS
5555H
2AAAH
5555H
5555H
2AAAH
5555H
DATA
AAH
55H
80H
AAH
55H
20H
Software Data Protection Acquisition Flow
Software Data Protection
Enable Flow
Load data AA
to
address 5555
Software Data Protection
Disable Flow
Load data AA
to
address 5555
Load data 55
to
address 2AAA
Load data 55
to
address 2AAA
Load data A0
to
address 5555
Load data 80
to
address 5555
(Optional page-load
operation)
Sequentially load
up to 128 bytes
of page data
Load data AA
to
address 5555
Pause 10 mS
Load data 55
to
address 2AAA
Exit
Load data 20
to
address 5555
Pause 10 mS
Exit
Notes for software program code:
Data Format: DQ7−DQ0 (Hex)
Address Format: A14−A0 (Hex)
-6-
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