m29w400db STMicroelectronics, m29w400db Datasheet - Page 45

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

M29W400DT, M29W400DB
Figure 21. In-system equipment block protect flowchart
ADDRESS = BLOCK ADDRESS
ADDRESS = BLOCK ADDRESS
ADDRESS = BLOCK ADDRESS
ADDRESS = BLOCK ADDRESS
A0 = V IL , A1 = V IH , A6 = V IL
A0 = V IL , A1 = V IH , A6 = V IL
A0 = V IL , A1 = V IH , A6 = V IL
A0 = V IL , A1 = V IH , A6 = V IL
ISSUE READ/RESET
READ DATA
Wait 100 µs
COMMAND
WRITE 60h
WRITE 60h
WRITE 40h
RP = V ID
Wait 4 µs
RP = V IH
START
DATA
PASS
n = 0
01h
=
YES
NO
ISSUE READ/RESET
COMMAND
RP = V IH
FAIL
= 25
++n
YES
NO
Block protection
AI03471
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