A29L320 AMICC [AMIC Technology], A29L320 Datasheet - Page 14

• Manufacturer Part Number: A29L320
• Description: 4M X 8 Bit / 2M X 16 Bit CMOS 3.3 Volt-only, Boot Sector Flash Memory
• Manufacturer: AMICC [AMIC Technology]

PRELIMINARY
Sector Protect
Temporary Sector
Unprotect Mode
Algorithm
Device failed
PLSCNT
Increment
PLSCNT
=25?
No
Yes
No
(September, 2005, Version 0.0)
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 Protec:
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:
algorithm must be
unprotect address
the sector protect
performed for all
13
Sector Unprotect
Algorithm
Device failed
Increment
PLSCNT=
PLSCNT
1000?
No
Yes
No
No
address with A6=1,
address with A6=1,
address with A6=1,
Write 60h to sector
Sector Unprotect:
Set up first sector
Read from sector
Unprotect : Write
Sector Unprotect
Verify Sector
40h to sector
Wait 500 ms
from RESET
RESET=V
Cycle=60h?
A1=1, A0=0
A1=1, A0=0
A1=1, A0=0
Remove V
PLSCNT=1
Data=00h?
Last sector
protected?
Write reset
First Write
All sectors
Command
Wait 1 us
complete
AMIC Technology, Corp.
verified?
address
START
Yes
Yes
Yes
Yes
ID
ID
A29L320 Series
No
No
Temporary Sector
next sector
Unprotect Mode
address
Set up