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M29W400DT Datasheet(PDF) 44 Page - STMicroelectronics

Part # M29W400DT
Description  4 Mbit (512 Kb x 8 or 256 Kb x 16, boot block) 3 V supply Flash memory
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M29W400DT Datasheet(HTML) 44 Page - STMicroelectronics

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



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