MM29F400T-55N6R View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

MM29F400T-55N6R

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

STMicroelectronics 

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M29F400T, M29F400B

Figure 14. Block Protection Flowchart

Set-up

Protect

Verify

START

BLOCK ADDRESS

on A12-A17

W = VIH

n=0

G, A9 = VID,

E = VIL

Wait 4µs

W = VIL

Wait 100µs

W = VIH

E, G = VIH

VERIFY BLOCK PROTECTION

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

A12-A17 IDENTIFY BLOCK

E = VIL

Wait 4µs

G = VIL

Wait 60ns

VERIFY BLOCK

PROTECT STATUS

DATA NO

=

01h

YES

A9 = VIH

PASS

++n NO

= 25

YES

A9 = VIH

FAIL

AI01875E

28/34

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