AT88SC0104CA_11 ATMEL [ATMEL Corporation], AT88SC0104CA_11 Datasheet - Page 23

• Manufacturer Part Number: AT88SC0104CA_11
• Description: Atmel CryptoMemory Specification Datasheet
• Manufacturer: ATMEL [ATMEL Corporation]

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. Blowing the remainder of the fuses must follow the sequence:
Any attempt to blow a fuse out of sequence will be unsuccessful.
Table 6-10 provides a summary of access rights for all portions of the memory for each fuse condition.
Table 6-10. Configuration Memory Access Control by Security Fuses
Note:
Zone
Identification
(Except MTZ and CMC)
Memory Test Zone
(MTZ)
Card Manufacturer Code
(CMC)
Read Only
(Lot History Code)
Access Control
Cryptography
(Except Encryption Keys S)
Encryption Keys
(S)
Secret
Passwords
Password Attempts
Counters
(PAC)
Forbidden
•
•
•
FAB
CMA
PER
Secure code: Write 7 password is the secure code until the PER fuse is blown
To lock the ATR and the fab code portions of the configuration memory
To lock the card manufacturer code of the configuration memory
To lock the remainder of the configuration memory
Operation
Read
Write
Read
Write
Read
Write
Read
Write
Read
Write
Read
Write
Read
Write
Read
Write
Read
Write
Read
Write
Read
Write
Atmel AT88SC0104CA/0204CA/0404CA/0808CA [Datasheet]
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Forbidden
Forbidden
SEC = 0
Free
Free
Free
Free
Free
Free
Free
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Forbidden
Forbidden
Forbidden
FAB = 0
Free
Free
Free
Free
Free
Free
Free
Fuse
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Forbidden
Forbidden
Forbidden
Forbidden
CMA = 0
Free
Free
Free
Free
Free
Free
Free
8664E−CRYPTO−12/11
Forbidden
Forbidden
Forbidden
Forbidden
Forbidden
Forbidden
Forbidden
Forbidden
Write PW
Write PW
PER = 0
Free
Free
Free
Free
Free
Free
Free
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