Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Fiche De Données

637

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

Name: AES_MR

0x40004004

Access: Read/Write 



0: Decrypts data.

1: Encrypts data.





Processing Time = N 

× (PROCDLY + 1)

where

N = 10 when KEYSIZE = 0

N = 12 when KEYSIZE = 1

N = 14 when KEYSIZE = 2

The Processing Time represents the number of clock cycles that the AES needs in order to perform one 
encryption/decryption.

Note: The best performance is achieved with PROCDLY equal to 0.



Values which are not listed in the table must be considered as “reserved”.

If a DMA transfer is used, 0x2 must be configured. Refer to 

 for more details.

31

30

29

28

27

26

25

24

–

–

–

–

–

–

–

–

23

22

21

20

19

18

17

16

CKEY

–

CFBS

15

14

13

12

11

10

9

8

LOD

OPMOD

KEYSIZE

SMOD

7

6

5

4

3

2

1

0

PROCDLY

DUALBUFF

–

–

CIPHER

0x0

INACTIVE

AES_IDATARx cannot be written during processing of previous block.

0x1

ACTIVE

AES_IDATARx can be written during processing of previous block when SMOD = 0x2. It speeds 
up the overall runtime of large files.

0x0

MANUAL_STAR
T

Manual Mode

0x1

AUTO_START

Auto Mode

0x2

IDATAR0_START

AES_IDATAR0 access only Auto Mode