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AM29LV640MT100REF bảng dữ liệu(PDF) 24 Page - Advanced Micro Devices

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Giải thích chi tiết về linh kiện  64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit??3.0 Volt-only Boot Sector Flash Memory
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Trang chủ  http://www.amd.com
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AM29LV640MT100REF bảng dữ liệu(HTML) 24 Page - Advanced Micro Devices

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22
Am29LV640MT/B
26190C8 February 1, 2007
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–A0 = 0xx0010
Set up sector
group address
Wait 150 µs
Verify Sector Group
Protect: Write 40h
to sector group
address with
A6–A0 = 0xx0010
Read from
sector group address
with A6–A0
= 0xx0010
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–A0 = 1xx0010
Set up first sector
group address
Wait 15 ms
Verify Sector Group
Unprotect: Write
40h to sector group
address with
A6–A0 = 1xx0010
Read from
sector group
address with
A6–A0 = 1xx0010
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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