Flowcharts
Figure 21. In-System equipment Chip Unprotect flowchart
START
PROTECT ALL GROUPS
n=0
CURRENT GROUP = 0
M29W128FH, M29W128FL
Set-up
RP = VID
WRITE 60h
ANY ADDRESS WITH
A1 = VIH, A0, A2 to A7 = VIL
Unprotect
WRITE 60h
ANY ADDRESS WITH
A0, A2, A3, A4, A5, A7 = VIL
A1, A6 = VIH
Wait 10ms
WRITE 40h
ADDRESS =
CURRENT GROUP ADDRESS
A1 = VIH, A0, A2 to A7 = VIL
Verify
Wait 4µs
READ DATA
ADDRESS =
CURRENT GROUP ADDRESS
A1 = VIH, A0, A2 to A7 = VIL
NO
YES
INCREMENT
CURRENT GROUP
DATA = 00h
NO
End
++n
= 1000
YES
RP = VIH
LAST
GROUP
YES
RP = VIH
NO
ISSUE READ/RESET
COMMAND
FAIL
ISSUE READ/RESET
COMMAND
PASS
AI07759d
1. Block Protection Groups are shown in
74/78