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