M29W400 ST Microelectronics, M29W400 Datasheet - Page 28

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

M29W400T, M29W400B
Figure 15. All Blocks Unprotecting Flowchart
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NO
A9 = V IH
= 1000
FAIL
++n
YES
E, A0 = V IL ; A1, A6 = V IH ; A9 = V ID
A12-A17 IDENTIFY BLOCK
NO
PROTECT STATUS
VERIFY BLOCK
A12, A15 = V IH
E, G, A9 = V ID
ALL BLOCKS
E, G = V IH
PROTECT
Wait 10ms
Wait 60ns
Wait 4 s
Wait 4 s
W = V IH
W = V IH
W = V IL
G = V IL
START
DATA
n = 0
00h
=
YES
Unprotect
A9 = V IH
Set-up
PASS
Verify
LAST
BLK.
YES
NO
BLOCK
NEXT
AI01876C