Block Protection
M29W640GH, M29W640GL, M29W640GT, M29W640GB
Table 37. Programmer technique bus operations, BYTE = V or V
IH
IL
Data
Inputs/Outputs
DQ15A–1, DQ14-
DQ0
Address Inputs
A0-A21
Operation
E
G
W
A9 = VID, A12-A21 = Block Address
Others = X
Block (Group)
Protect(1)
VIL VID VIL Pulse
VID VID VIL Pulse
X
X
A9 = VID, A12 = VIH, A15 = VIH
Others = X
Chip Unprotect
A0, A2, A3 = VIL, A1 = VIH, A6 = VIL,
A9 = VID, A12-A21 = Block Address
Pass = XX01h
Retry = XX00h
Block (Group)
Protection Verify
VIL VIL
VIH
Others = X
A0, A2, A3 = VIL, A1 = VIH, A6 = VIH,
A9 = VID, A12-A21 = Block Address
Retry = XX01h
Pass = XX00h
Block (Group)
Unprotection Verify
VIL VIL
VIH
Others = X
1. Block Protection Groups are shown in Appendix A, Tables 28 and 29.
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NUMONYX [ NUMONYX B.V ]
