M29FxxxFT, M29FxxxFB
Block protection
Figure 28. Programmer Equipment Chip Unprotect Flowchart
START
PROTECT ALL BLOCKS
n = 0
CURRENT BLOCK = 0
A6, A12, A15 = V
IH
E, G, A9 = V
ID
Wait 4µs
W = V
IL
Wait 10ms
W = V
IH
E, G = V
IH
ADDRESS= CURRENTBLOCKADDRESS
A0 = V , A1, A6 = V
IL
IH
E = V
IL
Wait 4µs
G = V
IL
INCREMENT
CURRENT BLOCK
Wait 60ns
Read DATA
NO
YES
DATA
=
00h
LAST
BLOCK
NO
NO
++n
= 1000
YES
YES
A9 = V
IH
E, G = V
A9 = V
IH
E, G = V
IH
IH
FAIL
PASS
AI03470
63/67