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A29L008AUV-90UF

1M X 8 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory

AMIC Technology 

START

PLSCNT=1

RESET=V ID

Wait 1 us

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

A29L008A Series

START

PLSCNT=1

RESET=V ID

Wait 1 us

Temporary Sector No First Write

Unprotect Mode

Cycle=60h?

Yes

Set up sector

address

Sector Protect

Write 60h to sector

address with A6=0,

A1=1, A0=0

No

First Write

No Temporary Sector

Cycle=60h?

Unprotect Mode

Yes

All sectors

protected?

Yes

Set up first sector

address

Increment

PLSCNT

Wait 150 us

Verify Sector

Protect: Write 40h

to sector address

with A6=0, A1=1,

A0=0

Reset

PLSCNT=1

No

PLSCNT

=25?

Read from

sector address

with A6=0,

A1=1, A0=0

No

Data=01h?

Yes

Device failed

Yes

Protect another

Yes

sector?

No

Remove VID

from RESET

Sector Protect

Algorithm

Write reset

command

Sector Protect

complete

Sector Unprotect:

Write 60h to sector

address with A6=1,

A1=1, A0=0

Increment

PLSCNT

Wait 15 ms

Verify Sector

Unprotect : Write

40h to sector

address with A6=1,

A1=1, A0=0

No

PLSCNT=

1000?

Read from sector

address with A6=1,

A1=1, A0=0

No

Data=00h?

Set up

next sector

address

Yes

Device failed

Yes

Last sector

No

verified?

Sector Unprotect

Algorithm

Yes

Remove V ID

from RESET

Write reset

Command

Sector Unprotect

complete

Figure 2. In-System Sector Protect/Unprotect Algorithms

(October, 2006, Version 1.0)

9

AMIC Technology, Corp.

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