M29W400 ST Microelectronics, M29W400 Datasheet - Page 27

• Manufacturer Part Number: M29W400
• Description: 4 Mbit 512Kb x8 or 256Kb x16 / Boot Block Low Voltage Single Supply Flash Memory
• Manufacturer: ST Microelectronics

Figure 14. Block Protection Flowchart
Set-up
Protect
Verify
A0, A6 = V IL ; A1 = V IH ; A9 = V ID
VERIFY BLOCK PROTECTION
A12-A17 IDENTIFY BLOCK
PROTECT STATUS
BLOCK ADDRESS
VERIFY BLOCK
G, A9 = V ID ,
on A12-A17
Wait 100 s
E, G = V IH
Wait 60ns
A9 = V IH
W = V IH
Wait 4 s
W = V IH
Wait 4 s
W = V IL
G = V IL
START
E = V IL
E = V IL
DATA
PASS
n = 0
01h
=
YES
NO
A9 = V IH
= 25
FAIL
++n
YES
AI01875E
NO
M29W400T, M29W400B
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