M29W320ET, M29W320EB
Block Protection
Figure 22. In-system Equipment Chip Unprotect flowchart
START
PROTECT ALL GROUPS
n = 0
CURRENT GROUP = 0
RP = V
ID
WRITE 60h
ANY ADDRESS WITH
A0 = V , A1 = V , A6 = V
IL
IH
IH
WRITE 60h
ANY ADDRESS WITH
A0 = V , A1 = V , A6 = V
IL
IH
IH
Wait 10ms
WRITE 40h
ADDRESS = CURRENT GROUP ADDRESS
A0 = V , A1 = V , A6 = V
IL
IH
IH
Wait 4µs
INCREMENT
CURRENT GROUP
READ DATA
ADDRESS = CURRENT GROUP ADDRESS
A0 = V , A1 = V , A6 = V
IL
IH
IH
DATA
NO
YES
=
00h
++n
= 1000
NO
NO
LAST
GROUP
YES
YES
RP = V
IH
RP = V
IH
ISSUE READ/RESET
COMMAND
ISSUE READ/RESET
COMMAND
PASS
FAIL
AI05577
1. Block Protection groups are shown in Appendix A: Block Addresses, Table 20 and Table 21.
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