M29W320DT, M29W320DB
44/46
Figure 24. In-System Equipment Chip Unprotect Flowchart
AI03472
WRITE 60h
ANY ADDRESS WITH
A0 = VIL, A1 = VIH, A6 = VIH
n = 0
CURRENT BLOCK = 0
Wait 10ms
WRITE 40h
ADDRESS = CURRENT BLOCK ADDRESS
A0 = VIL, A1 = VIH, A6 = VIH
RP = VIH
++n
= 1000
START
FAIL
PASS
YES
NO
DATA
=
00h
YES
NO
RP = VIH
Wait 4μs
READ DATA
ADDRESS = CURRENT BLOCK ADDRESS
A0 = VIL, A1 = VIH, A6 = VIH
RP = VID
ISSUE READ/RESET
COMMAND
ISSUE READ/RESET
COMMAND
PROTECT ALL BLOCKS
INCREMENT
CURRENT BLOCK
LAST
BLOCK
YES
NO
WRITE 60h
ANY ADDRESS WITH
A0 = VIL, A1 = VIH, A6 = VIH
V
U
S
E