AM29SL800DB120WAC AMD [Advanced Micro Devices], AM29SL800DB120WAC Datasheet - Page 15

• Manufacturer Part Number: AM29SL800DB120WAC
• Description: 8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 1.8 Volt-only Super Low Voltage Flash Memory
• Manufacturer: AMD [Advanced Micro Devices]

January 23, 2007 27546A6
Sector Protect
Temporary Sector
Unprotect Mode
Algorithm
Device failed
Increment
PLSCNT
PLSCNT
= 25?
No
Yes
No
No
Write 60h to sector
Protect: Write 40h
to sector address
A6 = 0, A1 = 1,
RESET# = V ID
Sector Protect:
sector address
Protect another
A1 = 1, A0 = 0
A1 = 1, A0 = 0
Sector Protect
from RESET#
Verify Sector
Remove V ID
Set up sector
PLSCNT = 1
Cycle = 60h?
address with
with A6 = 0,
with A6 = 0,
Wait 150 µs
Data = 01h?
Read from
Write reset
First Write
Wait 1 ms
command
complete
address
START
sector?
A0 = 0
Figure 1. In-System Sector Protect/Unprotect Algorithms
Yes
Yes
No
Yes
PLSCNT = 1
D A T A
Reset
Am29SL800D
The indicated portion
unprotected sectors
of the sector protect
S H E E T
prior to issuing the
Protect all sectors:
unprotect address
algorithm must be
performed for all
Sector Unprotect
first sector
Algorithm
Device failed
Increment
PLSCNT
PLSCNT
= 1000?
Yes
No
No
No
Write 60h to sector
Set up first sector
Sector Unprotect:
Unprotect: Write
Sector Unprotect
A6 = 1, A1 = 1,
A6 = 1, A1 = 1,
RESET# = V ID
sector address
A1 = 1, A0 = 0
from RESET#
Verify Sector
40h to sector
Remove V ID
address with
PLSCNT = 1
Cycle = 60h?
address with
with A6 = 1,
Data = 00h?
Wait 15 ms
Read from
Write reset
Last sector
First Write
Wait 1 ms
command
All sectors
protected?
complete
address
verified?
START
A0 = 0
A0 = 0
Yes
Yes
Yes
Yes
No
No
Temporary Sector
Unprotect Mode
next sector
address
Set up
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