m29w400d Numonyx, m29w400d Datasheet - Page 44

• Manufacturer Part Number: m29w400d
• Description: 4 Mbit 512 Kb X 8 Or 256 Kb X 16, Boot Block 3 V Supply Flash Memory
• Manufacturer: Numonyx

Block protection
44/48
Figure 20. Programmer equipment chip unprotect flowchart
NO
E, G = V IH
A9 = V IH
= 1000
FAIL
++n
YES
ADDRESS = CURRENT BLOCK ADDRESS
PROTECT ALL BLOCKS
CURRENT BLOCK = 0
A0 = V IL , A1, A6 = V IH
NO
A6, A12, A15 = V IH
E, G, A9 = V ID
Read DATA
Wait 10 ms
E, G = V IH
Wait 60 ns
Wait 4 µs
Wait 4 µs
W = V IH
W = V IL
G = V IL
START
E = V IL
DATA
n = 0
00h
=
YES
E, G = V IH
A9 = V IH
BLOCK
PASS
LAST
M29W400DT, M29W400DB
YES
CURRENT BLOCK
INCREMENT
NO
AI03470