m29w400db STMicroelectronics, m29w400db Datasheet - Page 43

• Manufacturer Part Number: m29w400db
• Description: 4 Mbit 512kb X8 Or 256kb X16, Boot Block 3v Supply Flash Memory
• Manufacturer: STMicroelectronics

M29W400DT, M29W400DB
Figure 19. Programmer equipment block protect flowchart
ADDRESS = BLOCK ADDRESS
A0, A6 = V IL ,
G, A9 = V ID ,
Read DATA
Wait 100 µs
E, G = V IH ,
Wait 60 ns
E, G = V IH
Wait 4 µs
Wait 4 µs
A1 = V IH
A9 = V IH
W = V IH
W = V IH
W = V IL
G = V IL
START
E = V IL
E = V IL
DATA
PASS
n = 0
01h
=
YES
NO
E, G = V IH
A9 = V IH
FAIL
= 25
++n
YES
NO
Block protection
AI03469
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