Datasheet

437
42023E–SAM–07/2013
ATSAM4L8/L4/L2
• CFBS: Cipher Feedback Data Segment Size
See NIST Special Publications 800-38A, Recommendation for Block Cipher Modes of Operation - Methods and Techniques for
information on the CFB mode of operation.
See Section 18.4.2 on page 431 for information on operating AESA in the CFB mode.
• OPMODE: Confidentiality Mode of Operation
See NIST Special Publications 800-38A, Recommendation for Block Cipher Modes of Operation - Methods and Techniques for
descriptions of the various confidentiality modes of operation.
See Section 18.4.2 on page 431 for information on operating AESA in these modes.
• DMA: DMA Mode
• ENCRYPT: Encryption
CFBS Description
0 128 bits
164 bits
232 bits
316 bits
4 8 bits
Others Reserved
OPMODE Description
0 Electronic Code Book
1 Cipher Block Chaining
2 Cipher Feedback
3 Output Feedback
4 Counter
Others Reserved
DMA Description
0 Non-DMA mode
1 DMA mode
ENCRYPT Description
0Decryption
1 Encryption