AES Registers
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ENCCS (0xB3) – Encryption Control and Status
Bit Name Reset R/W Description
7 – 0 R0 Reserved, always read as 0
6:4
MODE[2:0]
000 R/W Encryption/decryption mode
000: CBC
001: CFB
010: OFB
011: CTR
100: ECB
101: CBC MAC
110: Reserved
111: Reserved
3
RDY
1 R Encryption/decryption ready status
0: Encryption/decryption in progress
1: Encryption/decryption is completed.
2:1
CMD[1:0]
0 R/W
Command to be performed when a 1 is written to ST
00: Encrypt block
01: Decrypt block
10: Load key
11: Load IV/nonce
0 0 R/W1 Start processing command set by CMD. Must be issued for each command or 128-bit block of data.
ST
H0 Cleared by hardware.
ENCDI (0xB1) – Encryption Input Data
Bit Name Reset R/W Description
7:0
DIN[7:0]
0x00 R/W Encryption input data
ENCDO (0xB2) – Encryption Output Data
Bit Name Reset R/W Description
7:0
DOUT[7:0]
0x00 R/W Encryption output data
158
AES Coprocessor SWRU191C–April 2009–Revised January 2012
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