AM29LV800BT-70EI AMD (ADVANCED MICRO DEVICES), AM29LV800BT-70EI Datasheet - Page 18

• Manufacturer Part Number: AM29LV800BT-70EI
• Description: IC 8M FLSH (512KX16) TOP SECTO
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

16
Temporary Sector
Unprotect Mode
Device failed
Sector Protect
Increment
PLSCNT
PLSCNT
Algorithm
= 25?
No
Yes
No
No
Write 60h to sector
Protect: Write 40h
to sector address
A6 = 0, A1 = 1,
Sector Protect:
A1 = 1, A0 = 0
A1 = 1, A0 = 0
Protect another
RESET# = V ID
sector address
Sector Protect
Verify Sector
Set up sector
with A6 = 0,
with A6 = 0,
Remove V ID
from RESET#
Cycle = 60h?
address with
PLSCNT = 1
Data = 01h?
Wait 150 μs
Write reset
Read from
First Write
Wait 1 ms
command
complete
address
A0 = 0
sector?
START
No
Yes
Yes
Yes
Figure 2. In-System Sector Protect/
PLSCNT = 1
Sector Unprotect Algorithms
Reset
Am29LV800B
The indicated portion
unprotected sectors
of the sector protect
prior to issuing the
Protect all sectors:
unprotect address
algorithm must be
performed for all
first sector
Sector Unprotect
Device failed
Increment
Algorithm
= 1000?
PLSCNT
PLSCNT
No
Yes
No
No
Write 60h to sector
Set up first sector
Sector Unprotect:
Unprotect: Write
Sector Unprotect
A6 = 1, A1 = 1,
A6 = 1, A1 = 1,
A1 = 1, A0 = 0
RESET# = V ID
sector address
40h to sector
Verify Sector
from RESET#
address with
with A6 = 1,
Remove V ID
Cycle = 60h?
address with
PLSCNT = 1
Data = 00h?
Write reset
Wait 15 ms
Read from
First Write
Last sector
Wait 1 ms
command
All sectors
protected?
complete
verified?
address
A0 = 0
A0 = 0
START
Yes
Yes
Yes
Yes
No
No
Temporary Sector
Unprotect Mode
next sector
address
Set up