M29F400B-70N6TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

M29F400B-70N6TR

4 Mbit (512Kb x8 or 256Kb x16, Boot Block)Single Supply Flash Memory

STMicroelectronics 

Figure 15. All Blocks Unprotecting Flowchart

M29F400T, M29F400B

START

PROTECT

ALL BLOCKS

n=0

W = VIH

E, G, A9 = VID

A12, A15 = VIH

Wait 4µs

W = VIL

Wait 10ms

W = VIH

E, G = VIH

Set-up

Unprotect

Verify

E, A0 = VIL; A1, A6 = VIH; A9 = VID

A12-A17 IDENTIFY BLOCK

Wait 4µs

G = VIL

Wait 60ns

VERIFY BLOCK

PROTECT STATUS

NEXT

BLOCK

NO ++n

= 1000

YES

A9 = VIH

FAIL

NO DATA YES

=

00h

LAST NO

BLK.

YES

A9 = VIH

PASS

AI01876C

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