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AT88SC0104C データシート(PDF) 23 Page - ATMEL Corporation

部品番号 AT88SC0104C
部品情報  CryptoMemory Specification For Standard Mode of Operation
PDF  58 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT88SC0104C データシート(HTML) 23 Page - ATMEL Corporation

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5210B–SMIC–11/08
AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C
5.4
Security Fuses
CryptoMemory uses four fuses. The status of these fuses is given in a ‘fuse byte.’ A value of ‘0’
indicates that the fuse has been blown. Bits 4 to 7 of this byte are not used as Security Fuses
and are reserved for Atmel use.
The bits SEC, PER, CMA and FAB are non-volatile fuses blown at the end of various steps in
the manufacturing and personalization process. Once blown, these fuses can never be reset.
Atmel blows the SEC fuse to lock the lot history code before the device leaves the factory. Blow-
ing the remainder of the fuses must follow the sequence:
1.
FAB – To lock the Answer To Reset and the Fab Code portions of the Configuration
Memory.
2.
CMA – To lock the Card Manufacturer Code of the Configuration Memory
3.
PER – To lock the remainder of the Configuration Memory
Any attempt to blow a fuse out of sequence will be unsuccessful.
Table 5-8 on page 21 provides a summary of access rights for all portions of the memory for
each fuse condition.
Table 5-7.
Device Fuses
F
7
F
6
F
5
F
4
F
3
F
2
F
1
F
0
resv
resv
resv
resv
SEC
PER
CMA
FAB



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