S29AL004D Ver la hoja de datos (PDF) - Spansion Inc.

Número de pieza

componentes Descripción

Fabricante

S29AL004D

4 Megabit (512 Kx 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory

Spansion Inc. 

Advance Information

START

PLSCNT = 1

RESET# = VID

Wait 1 µs

Temporary Sector No First Write

Unprotect Mode

Cycle = 60h?

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

START

PLSCNT = 1

RESET# = VID

Wait 1 µs

First Write No Temporary Sector

Cycle = 60h?

Unprotect Mode

Increment

PLSCNT

No

PLSCNT

= 25?

Yes

Device failed

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

Reset

PLSCNT = 1

No

Data = 01h?

Yes

Yes

Protect another

sector?

No

Remove VID

from RESET#

Write reset

command

Sector Protect Sector Protect

Algorithm

complete

Increment

PLSCNT

Yes

No All sectors

protected?

Yes

Set up first sector

address

Sector Unprotect:

Write 60h to sector

address with

A6 = 1, A1 = 1,

A0 = 0

Wait 15 ms

Verify Sector

Unprotect: Write

40h to sector

address with

A6 = 1, A1 = 1,

A0 = 0

No

PLSCNT

= 1000?

Yes

Read from

sector address

with A6 = 1,

A1 = 1, A0 = 0

No

Data = 00h?

Yes

Set up

next sector

address

Device failed

Last sector No

verified?

Yes

Sector Unprotect

Algorithm

Remove VID

from RESET#

Write reset

command

Sector Unprotect

complete

Figure 2. In-System Sector Protect/Sector Unprotect Algorithms

February 18, 2005 S29AL004D_00_A1

S29AL004D

17

Share Link: