AM29LV800DB120EC SPANSION [SPANSION], AM29LV800DB120EC Datasheet - Page 16

• Manufacturer Part Number: AM29LV800DB120EC
• Description: 8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
• Manufacturer: SPANSION [SPANSION]

14
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,
Protect another
Sector Protect:
sector address
RESET# = V
A1 = 1, A0 = 0
A1 = 1, A0 = 0
Sector Protect
from RESET#
Set up sector
Verify Sector
Cycle = 60h?
Remove V
PLSCNT = 1
address with
with A6 = 0,
with A6 = 0,
Wait 150 µs
Data = 01h?
Write reset
Read from
First Write
Wait 1 ms
command
complete
address
START
sector?
A0 = 0
Yes
Yes
No
ID
ID
Yes
Figure 2. In-System Sector Protect/
Sector Unprotect Algorithms
PLSCNT = 1
Reset
D A T A
Am29LV800D
The indicated portion
unprotected sectors
of the sector protect
prior to issuing the
Protect all sectors:
unprotect address
algorithm must be
performed for all
S H E E T
Sector Unprotect
first sector
Algorithm
Device failed
Increment
PLSCNT
PLSCNT
= 1000?
Yes
No
No
No
Am29LV800D_00_A7 December 4, 2006
Write 60h to sector
Set up first sector
Sector Unprotect:
Unprotect: Write
Sector Unprotect
A6 = 1, A1 = 1,
A6 = 1, A1 = 1,
sector address
RESET# = V
A1 = 1, A0 = 0
40h to sector
from RESET#
Verify Sector
address with
Cycle = 60h?
PLSCNT = 1
address with
Remove V
with A6 = 1,
Data = 00h?
Write reset
Wait 15 ms
Read from
Last sector
First Write
Wait 1 ms
All sectors
protected?
command
complete
address
verified?
START
A0 = 0
A0 = 0
Yes
Yes
Yes
Yes
ID
ID
No
No
Temporary Sector
Unprotect Mode
next sector
address
Set up