S29AL016 데이터 시트보기 (PDF) - Spansion Inc.

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S29AL016

16 Megabit (2 M x 8-Bit/1 M x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory

Spansion Inc. 

Data Sheet

Temporary Sector

Unprotect Mode

Figure 7.2 In-System Sector Protect/Unprotect Algorithms

START

PLSCNT = 1

RESET# = VID

Wait 1 μs

No First Write

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#

Sector Protect

Algorithm

Write reset

command

Sector Protect

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

Sector Unprotect

Algorithm

Last sector No

verified?

Yes

Remove VID

from RESET#

Write reset

command

Sector Unprotect

complete

February 27, 2009 S29AL016D_00_A8

S29AL016D

21

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