M700000002 datasheet(91/128 Pages) SPANSION

91 / 128 page

November 25, 2003

Am70PDL127BDH/Am70PDL129BDH

AD VAN C E

INFORM ATION

Figure 2.

In-System Sector Group Protect/Unprotect Algorithms

Sector Group Protect:

Write 60h to sector

group address with

A6–A0 = 0xx0010

Set up sector

group address

Wait 150 µs

Verify Sector Group

Protect: Write 40h

to sector group

address with

A6–A0 = 0xx0010

Read from

sector group address

with A6–A0

= 0xx0010

START

PLSCNT = 1

RESET# = VID

Wait 1

µs

First Write

Cycle = 60h?

Data = 01h?

Remove VID

from RESET#

Write reset

command

Sector Group

Protect complete

Yes

PLSCNT

= 25?

Yes

Device failed

Increment

PLSCNT

Temporary Sector

Group Unprotect

Mode

Sector Group

Unprotect:

Write 60h to sector

group address with

A6–A0 = 1xx0010

Set up first sector

group address

Wait 15 ms

Verify Sector Group

Unprotect: Write

40h to sector group

address with

A6–A0 = 1xx0010

Read from

sector group

address with

A6–A0 = 1xx0010

START

PLSCNT = 1

RESET# = VID

Wait 1

µs

Data = 00h?

Last sector

group

verified?

Remove VID

from RESET#

Write reset

command

Sector Group

Unprotect complete

Yes

PLSCNT

= 1000?

Yes

Device failed

Increment

PLSCNT

Temporary Sector

Group Unprotect

Mode

All sector

groups

protected?

Yes

Protect all sector

groups: The indicated

portion of the sector

group protect algorithm

must be performed for all

unprotected sector

groups prior to issuing

the first sector group

unprotect address

Set up

next sector group

address

Yes

Sector Group

Protect

Algorithm

Sector Group

Unprotect

Algorithm

First Write

Cycle = 60h?

Protect

another

sector group?

Reset

PLSCNT = 1

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