A29L320A AMICC [AMIC Technology], A29L320A Datasheet - Page 17

• Manufacturer Part Number: A29L320A
• Description: 4M X 8 Bit / 2M X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory
• Manufacturer: AMICC [AMIC Technology]

(November, 2007, Version 1.1)
Sector Protect
Temporary Sector
Unprotect Mode
Algorithm
Device failed
PLSCNT
Increment
PLSCNT
Note: The term “sector” in the figure applies to both sectors and sector blocks
=25?
** Access time is 200ns-300ns
No
Yes
* No other command is allowed during this process
No
No
Figure 2-2. Software Sector/Sector Block Protection and Unprotection Algorithms
555/AA + 2AA/55 +
address with A6=0,
Write 60h to sector
Protect: Write 40h
to sector address
with A6=0, A1=1,
Protect another
Sector Protect:
sector address
Sector Protect
Set up sector
Verify Sector
Data=01h?**
Cycle=60h?
A1=1, A0=0
Wait 150 us
A1=1, A0=0
PLSCNT=1
Write reset
with A6=0,
First Write
Read from
command
Wait 1 us
complete
address
START
sector?
555/77
A0=0
Yes
No
Yes
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
16
Sector Unprotect
Algorithm
Device failed
PLSCNT=
Increment
PLSCNT
1000?
No
Yes
No
No
555/AA + 2AA/55 +
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
Data=00h?**
Cycle=60h?
A1=1, A0=0
A1=1, A0=0
A1=1, A0=0
PLSCNT=1
Wait 15 ms
Last sector
All sectors
protected?
Write reset
First Write
Command
AMIC Technology, Corp.
Wait 1 us
complete
verified?
address
START
555/77
Yes
Yes
Yes
Yes
A29L320A Series
No
No
Temporary Sector
next sector
Unprotect Mode
address
Set up