AUSTIN SEMICONDUCTOR, INC.
Austin Semiconductor, Inc.
Sector Un-Protect Algorithm Flow
START
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
PLSCNT = 1
RESET# = V
ID
Wait 1 ms
AS8FLC1M32
FLASH
First Write
Cycle = 60h?
Yes
No
All
sectors
protected?
Yes
Set up
first
sector
address
No
Temporary
Sector
Unprotect Mode
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
Read from
sector address
with A6 = 1,
A1 = 1, A0 = 0
Set up
next
sector
address
Increment
PLSCNT
No
No
PLSCNT
= 1000?
Yes
Data = 00h?
Yes
Device failed
Last
sector
verified?
Yes
No
Sector
Unprotect
Algorithm
Remove V
ID
from RESET#
Write reset
command
Sector
Unprotect
complete
AS8FLC1M32B
Rev. 3.3 05/08
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
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