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AM29LV256MH103REF Datasheet(PDF) 29 Page - Advanced Micro Devices

Part # AM29LV256MH103REF
Description  256 Megabit (16 M x 16-Bit/32 M x 8-Bit) MirrorBitTM 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/OTM Control
PDF  69 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM29LV256MH103REF Datasheet(HTML) 29 Page - Advanced Micro Devices

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December 16, 2005
Am29LV256M
27
D A TA SH EE T
Figure 2.
In-System Sector Group Protect/Unprotect Algorithms
Sector Group Protect:
Write 60h to sector
group address with
A6 = 0, A1 = 1,
A0 = 0
Set up sector
group address
Wait 150 µs
Verify Sector Group
Protect: Write 40h
to sector group
address twith A6 = 0,
A1 = 1, A0 = 0
Read from
sector group address
with A6 = 0,
A1 = 1, A0 = 0
START
PLSCNT = 1
RESET# = VID
Wait 1
μs
First Write
Cycle = 60h?
Data = 01h?
Remove VID
from RESET#
Write reset
command
Sector Group
Protect complete
Yes
Yes
No
PLSCNT
= 25?
Yes
Device failed
Increment
PLSCNT
Temporary Sector
Group Unprotect
Mode
No
Sector Group
Unprotect:
Write 60h to sector
group address with
A6 = 1, A1 = 1,
A0 = 0
Set up first sector
group address
Wait 15 ms
Verify Sector Group
Unprotect: Write
40h to sector group
address with
A6 = 1, A1 = 1,
A0 = 0
Read from
sector group
address with A6 = 1,
A1 = 1, A0 = 0
START
PLSCNT = 1
RESET# = VID
Wait 1
μs
Data = 00h?
Last sector
group
verified?
Remove VID
from RESET#
Write reset
command
Sector Group
Unprotect complete
Yes
No
PLSCNT
= 1000?
Yes
Device failed
Increment
PLSCNT
Temporary Sector
Group Unprotect
Mode
No
All sector
groups
protected?
Yes
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
Set up
next sector group
address
No
Yes
No
Yes
No
No
Yes
No
Sector Group
Protect
Algorithm
Sector Group
Unprotect
Algorithm
First Write
Cycle = 60h?
Protect
another
sector group?
Reset
PLSCNT = 1



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