Block protection
M29W400DT, M29W400DB
Table 23. Programmer technique bus operations, BYTE = V or V
IH
IL
Address inputs
A0-A17
Data inputs/outputs
DQ15A–1, DQ14-DQ0
Operation
E
G
W
A9 = VID,
A12-A17 block address,
VIL
pulse
Block Protect
VIL VID
X
X
others = X
VIL
pulse
A9 = VID, A12 = VIH, A15 = VIH,
others = X
Chip Unprotect
VID VID
A0 = VIL, A1 = VIH, A6 = VIL,
A9 = VID,
A12-A17 block address,
Pass = XX01h
Retry = XX00h
Block Protection
Verify
VIL VIL
VIH
others = X
A0 = VIL, A1 = VIH, A6 = VIH,
A9 = VID,
A12-A17 block address,
Block
Unprotection
Verify
Retry = XX01h
Pass = XX00h
VIL VIL
VIH
others = X
42/48