AM29BDS128HE8 datasheet(24/89 Pages) SPANSION

24 / 89 page

Am29BDS128H/Am29BDS640H

27024B3 May 10, 2006

D A TA

SH EE T

Figure 2.

In-System Sector Protection/

Sector Unprotection Algorithms

Sector Protect:

Write 60h to sector

address with

–A0 =

00000010

Set up sector

address

Wait 150 µs

Verify Sector

Protect: Write 40h

to sector address

with A7

–A0 =

00000010

Read from

sector address

with A7

–A0 =

00000010

START

PLSCNT = 1

RESET# = VID

Wait 1 ms

First Write

Cycle = 60h?

Data = 01h?

Remove VID

from RESET#

Write reset

command

Sector Protect

complete

Yes

PLSCNT

= 25?

Yes

Device failed

Increment

PLSCNT

Temporary Sector

Unprotect Mode

Sector Unprotect:

Write 60h to sector

address with

A7:A0 =

01000010

Set up first sector

address

Wait 1.5 ms

Verify Sector

Unprotect: Write

40h to sector

address with

–A0 =

00000010

Read from

sector address

with A7

–A0 =

00000010

START

PLSCNT = 1

RESET# = VID

Wait 1 ms

Data = 00h?

Last sector

verified?

Remove VID

from RESET#

Write reset

command

Sector Unprotect

complete

Yes

PLSCNT

= 1000?

Yes

Device failed

Increment

PLSCNT

Temporary Sector

Unprotect Mode

All sectors

protected?

Yes

Protect all sectors:

The indicated portion

of the sector protect

algorithm must be

performed for all

unprotected sectors

prior to issuing the

first sector

unprotect address

Set up

next sector

address

Yes

Sector Protect

Algorithm

Sector Unprotect

Algorithm

First Write

Cycle = 60h?

Protect another

sector?

Reset

PLSCNT = 1

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