Block Protection
M29W320ET, M29W320EB
Figure 21. In-system Equipment Group Protect flowchart
START
n = 0
RP = V
ID
WRITE 60h
ADDRESS = GROUP ADDRESS
A0 = V , A1 = V , A6 = V
IL
IH
IL
WRITE 60h
ADDRESS = GROUP ADDRESS
A0 = V , A1 = V , A6 = V
IL
IH
Wait 100µs
WRITE 40h
IL
ADDRESS = GROUP ADDRESS
A0 = V , A1 = V , A6 = V
IL
IH
IL
Wait 4µs
READ DATA
ADDRESS = GROUP ADDRESS
A0 = V , A1 = V , A6 = V
IL
IH
IL
DATA
NO
=
01h
YES
++n
= 25
NO
RP = V
IH
YES
ISSUE READ/RESET
COMMAND
RP = V
IH
PASS
ISSUE READ/RESET
COMMAND
FAIL
AI05576
1. Block Protection groups are shown in Appendix A: Block Addresses, Table 20 and Table 21.
2. RP can be either at VIH or at VID when using the In-system technique to protect the Extended Block.
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