A29L800 AMIC Technology, A29L800 Datasheet - Page 12

• Manufacturer Part Number: A29L800
• Description: 1M X 8 Bit / 512K X 16 Bit CMOS 3.0 Volt-only/ Boot Sector Flash Memory
• Manufacturer: AMIC Technology

PRELIMINARY
Sector Protect
Temporary Sector
Unprotect Mode
Algorithm
Device failed
PLSCNT
Increment
PLSCNT
=25?
No
Yes
(September, 2002, Version 0.2)
No
No
address with A6=0,
Write 60h to sector
Protect: Write 40h
to sector address
with A6=0, A1=1,
Protect another
sector address
Sector Protect
Sector Protect
Set up sector
Verify Sector
from RESET
Remove V
RESET=V
Cycle=60h?
A1=1, A0=0
Wait 150 us
A1=1, A0=0
PLSCNT=1
Data=01h?
Write reset
Read from
with A6=0,
First Write
command
Wait 1 us
complete
address
START
sector?
A0=0
Figure 2. In-System Sector Protect/Unprotect Algorithms
Yes
No
Yes
ID
ID
Yes
PLSCNT=1
Reset
unprotected sectors prior
to issuing the first sector
The indicated portion of
Protect all sectors:
unprotect address
algorithm must be
the sector protect
performed for all
Sector Unprotect
12
Algorithm
Device failed
PLSCNT=
Increment
PLSCNT
1000?
No
Yes
No
No
address with A6=1,
address with A6=1,
address with A6=1,
Write 60h to sector
Sector Unprotect:
Read from sector
Set up first sector
Unprotect : Write
Sector Unprotect
Verify Sector
40h to sector
from RESET
RESET=V
Cycle=60h?
A1=1, A0=0
A1=1, A0=0
A1=1, A0=0
Remove V
PLSCNT=1
Wait 15 ms
Data=00h?
Last sector
protected?
All sectors
Write reset
First Write
Command
Wait 1 us
verified?
complete
START
address
AMIC Technology, Inc.
Yes
Yes
Yes
Yes
ID
ID
A29L800 Series
No
No
Temporary Sector
next sector
Unprotect Mode
address
Set up