AM29LV640MH Datasheet, PDF (21/62 Pages) SPANSION – 64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control

DATASHEET
START
PLSCNT = 1
RESET# = V_ID
Wait 1 μs
Temporary Sector
Group Unprotect
Mode
No
First Write
Cycle = 60h?
Yes
Set up sector
group address
Increment
PLSCNT
Sector Group Protect:
Write 60h to sector
group address with
A6–A0 = 0xx0010
Wait 150 µs
Verify Sector Group
Protect: Write 40h
to sector group
address with
A6–A0 = 0xx0010
Protect all sector
groups: The indicated
portion of the sector
group protect algorithm
must be performed for all
unprotected sector
groups prior to issuing
the first sector group
unprotect address
Reset
PLSCNT = 1
START
PLSCNT = 1
RESET# = V_ID
Wait 1 μs
First Write
No
Cycle = 60h?
Yes
No
All sector
groups
protected?
Yes
Set up first sector
group address
Temporary Sector
Group Unprotect
Mode
Sector Group
Unprotect:
Write 60h to sector
group address with
A6–A0 = 1xx0010
Wait 15 ms
No
PLSCNT
= 25?
Yes
Device failed
Read from
sector group address
with A6–A0
= 0xx0010
No
Data = 01h?
Yes
Protect
Yes
another
sector group?
No
Remove V_ID
from RESET#
Sector Group
Protect
Algorithm
Write reset
command
Sector Group
Protect complete
Increment
PLSCNT
Verify Sector Group
Unprotect: Write
40h to sector group
address with
A6–A0 = 1xx0010
No
PLSCNT
= 1000?
Yes
Read from
sector group
address with
A6–A0 = 1xx0010
No
Data = 00h?
Yes
Set up
next sector group
address
Device failed
Sector Group
Unprotect
Algorithm
Last sector
No
group
verified?
Yes
Remove V_ID
from RESET#
Write reset
command
Figure 2. In-System Sector Group
Protect/Unprotect Algorithms
Sector Group
Unprotect complete
December 14, 2005
Am29LV640MH/L
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