Block Protection
M29W640GH, M29W640GL, M29W640GT, M29W640GB
Figure 28. In-System Equipment Chip Unprotect flowchart
START
PROTECT ALL GROUPS
Set-up
n=0
CURRENT GROUP = 0
RP = VID
WRITE 60h
ANY ADDRESS WITH
A0, A2, A3, A6 = VIL, A1 = VIH
Unprotect
WRITE 60h
ANY ADDRESS WITH
A0, A2, A3 = VIL, A1, A6 = VIH
Wait 10ms
WRITE 40h
ADDRESS = CURRENT GROUP ADDRESS
A0, A2, A3 = VIL, A1, A6 = VIH
Verify
Wait 4µs
READ DATA
ADDRESS = CURRENT GROUP ADDRESS
A0, A2, A3 = VIL, A1, A6 = VIH
INCREMENT
CURRENT GROUP
NO
DATA
=
00h
YES
NO
++n
= 1000
YES
RP = VIH
LAST
GROUP
YES
RP = VIH
NO
End
ISSUE READ/RESET
COMMAND
ISSUE READ/RESET
COMMAND
FAIL
PASS
AI11564
1. Block Protection Groups are shown in
Tables
and
86/90