AS29LV800 ANADIGICS Inc, AS29LV800 Datasheet - Page 14

• Manufacturer Part Number: AS29LV800
• Description: 3V 1M8/512K16 CMOS Flash EEPROM
• Manufacturer: ANADIGICS Inc

AS29LV800
Sector protect algorithm
14
Temporary sector
unprotect mode
PLSCNT=25?
Device failed
Increment
PLSCNT
No
Yes
No
No
write 60h to sector
to sector address
protect; write 40h
address with A6=0,
RESET# = V
Sector protect:
Read from sector
A6=0, A1=1,
Set up sector
Verify sector
A1=1, A0=0
A1=1, A0=0
Data=01h?
from RESET#
Sector protect
PLSCNT = 1
First Write
with A6=0,
Cycle=60h?
address with
Wait 150 µs
Wait 1 µs
Remove V
Write reset
Protect
another
command
complete
sector?
address
START
A0=0
Yes
Yes
No
ID
ID
Yes
ALLIANCE SEMICONDUCTOR
Sector unprotect algorithm
The shaded portion of
Protect all sectors:
algorithm must be
unprotected sectors
the sector protct
before calling the
initiated for all
sector unprotect
®
Device failed
PLSCNT
=1000?
Increment
PLSCNT
No
Yes
No
No
address with A6=1,
Sector unprotect:
write 60h to sector
to sector address
Sector unprotect
unprotect; write 40h
Read from sector
RESET# = V
sector address
from RESET#
A6=1, A1=1,
address with
A1=1, A0=0
PLSCNT = 1
A1=1, A0=0
First Write
Data=00h?
Cycle=60h?
All sectors
with A6=1,
Last sector
Remove V
Write reset
Set up first
Verify sector
Wait 1 µs
Wait 15 ms
protected?
command
complete
verified?
START
A0=0
Yes
Yes
Yes
Yes
ID
ID
No
No
DID 11-40002-A. 10/19/00
Temporary sector
October 2000
sector address
unprotect mode
Set up next