AS29LV800 データシートの表示（PDF） - Alliance Semiconductor

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AS29LV800

3V 1M × 8/512K × 16 CMOS Flash EEPROM

Alliance Semiconductor 

March 2001

Sector protect algorithm

START

PLSCNT = 1

RESET# = VID

Wait 1 µs

Temporary sector

unprotect mode

Increment

PLSCNT

No

No

First Write

Cycle=60h?

Yes

Set up sector

address

Sector protect:

write 60h to sector

address with

A6=0, A1=1,

A0=0

Wait 150 µs

Verify sector

protect; write 40h

to sector address

with A6=0,

A1=1, A0=0

Read from sector

address with A6=0,

A1=1, A0=0

PLSCNT=25?

No

Data=01h?

Yes

Device failed

Yes

Protect

Yes

another

sector?

No

Remove VID

from RESET#

Write reset

command

Sector protect

complete

®

Sector unprotect algorithm

AS29LV800

START

PLSCNT = 1

RESET# = VID

Wait 1 µs

Protect all sectors:

The shaded portion of

the sector protct

algorithm must be

initiated for all

unprotected sectors

before calling the

sector unprotect

No

First Write

Temporary sector

Cycle=60h?

unprotect mode

Yes

No

All sectors

protected?

Yes

Sector unprotect:

write 60h to sector

address with

A6=1, A1=1,

A0=0

Wait 15 ms

Increment

PLSCNT

Set up first

sector address

Verify sector

unprotect; write 40h

to sector address

with A6=1,

A1=1, A0=0

Read from sector

No

address with A6=1,

A1=1, A0=0

PLSCNT

=1000?

No

Data=00h?

Set up next

sector address

Yes

Device failed

Yes

No

Last sector

verified?

Yes

Remove VID

from RESET#

Write reset

command

Sector unprotect

complete

3/22/01; V.1.0

Alliance Semiconductor

P. 14 of 25

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