M29W640GH, M29W640GL, M29W640GT, M29W640GB
Figure 27. In-System Equipment Group Protect flowchart
Block Protection
START
n = 0
RP = V
ID
WRITE 60h
ADDRESS = GROUP ADDRESS
A0, A2, A3, A6 = V , A1 = V
IL
IH
WRITE 60h
ADDRESS = GROUP ADDRESS
A0, A2, A3, A6 = V , A1 = V
IL
Wait 100µs
WRITE 40h
IH
ADDRESS = GROUP ADDRESS
A0, A2, A3, A6 = V , A1 = V
IL
IH
Wait 4µs
READ DATA
ADDRESS = GROUP ADDRESS
A0, A2, A3, A6 = V , A1 = V
IL
IH
DATA
NO
=
01h
YES
++n
= 25
NO
RP = V
IH
YES
ISSUE READ/RESET
COMMAND
RP = V
IH
PASS
ISSUE READ/RESET
COMMAND
FAIL
AI11563
2. Block Protection Groups are shown in Appendix A, Tables 28 and 29.
3. RP can be either at VIH or at VID when using the In-System Technique to protect the Extended Block.
85/90
NUMONYX [ NUMONYX B.V ]
