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AM70PDL129CDH 데이터시트(PDF) 44 Page - Advanced Micro Devices

부품명 AM70PDL129CDH
상세설명  2 x 64 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-Only Page Mode Flash Memory Data Storage 128 Megabit (8 M x 16-Bit) CMOS
PDF  127 Pages
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM70PDL129CDH 데이터시트(HTML) 44 Page - Advanced Micro Devices

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Am70PDL127CDH/Am70PDL129CDH
November 24, 2003
ADV ANCE
I N FO RMAT I O N
Figure 3.
PDL127/9H SecSi Sector Protection Algorithm
The SecSi Sector lock must be used with caution
since, once locked, there is no procedure available for
unlocking the SecSi Sector area and none of the bits
in the SecSi Sector memory space can be modified in
any way.
SecSi Sector Protection Bits
The SecSi Sector Protection Bits prevent program-
ming of the SecSi Sector memory area. Once set, the
SecSi Sector memory area contents are non-modifi-
able.
START
SecSiTM Sector Entry
Write AAh to address 555h
Write 55h to address 2AAh
Write 88h to address 555h
SecSi Sector
Protection Entry
Write AAh to address 555h
Write 55h to address 2AAh
Write 60h to address 555h
PLSCNT = 1
Protect SecSi Sector:
write 68h to sector address
with A7–A0 = 00011010
Time out 256
µs
Read from sector address
with A7–A0 = 00011010
Data = 01h?
Yes
Yes
SecSi Sector
Protection Completed
SecSi Sector Exit
Write 555h/AAh
Write 2AAh/55h
Write SA0+555h/90h
Write XXXh/00h
Verify SecSi Sector:
write 48h to sector address
with A7–A0 = 00011010
Increment PLSCNT
PLSCNT = 25?
Device Failed
SecSi Sector Entry
SecSi Sector Protection
SecSi Sector Exit
No
No



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