Block Protection
M29W640GH, M29W640GL, M29W640GT, M29W640GB
Figure 28. In-System Equipment Chip Unprotect flowchart
START
PROTECT ALL GROUPS
n = 0
CURRENT GROUP = 0
RP = V
ID
WRITE 60h
ANY ADDRESS WITH
A0, A2, A3, A6 = V , A1 = V
IL
IH
IH
WRITE 60h
ANY ADDRESS WITH
A0, A2, A3 = V , A1, A6 = V
IL
Wait 10ms
WRITE 40h
ADDRESS = CURRENT GROUP ADDRESS
A0, A2, A3 = V , A1, A6 = V
IL
IH
Wait 4µs
INCREMENT
CURRENT GROUP
READ DATA
ADDRESS = CURRENT GROUP ADDRESS
A0, A2, A3 = V , A1, A6 = V
IL
IH
DATA
=
00h
NO
YES
++n
= 1000
NO
NO
LAST
GROUP
YES
RP = V
YES
RP = V
IH
IH
ISSUE READ/RESET
COMMAND
ISSUE READ/RESET
COMMAND
PASS
FAIL
AI11564
1. Block Protection Groups are shown in Appendix A, Tables 28 and 29.
86/90
NUMONYX [ NUMONYX B.V ]
