CC1110Fx / CC1111Fx
13.12.7 AES DMA Triggers
DMA channels used to transfer data to or
from the AES coprocessor.
There are two DMA triggers associated with
the AES coprocessor. These are ENC_DW,
which is active when input data needs to be
downloaded to the ENCDI register, and
ENC_UP, which is active when output data
needs to be uploaded from the ENCDO
register.
13.12.8 AES Registers
The AES coprocessor registers are
described below. These registers will be in
their reset state when returning to active
mode from PM2 and PM3.
The ENCDI and ENCDO registers should be
set as destination and source locations for
ENCCS (0xB3) – Encryption Control and Status
Bit
Name
Reset
R/W
Description
7
0
R0
Not used
6:4
MODE[2:0]
000
R/W
Encryption/decryption mode
000
001
010
011
100
101
110
111
CBC
CFB
OFB
CTR
ECB
CBC MAC
Reserved
Reserved
3
RDY
1
0
R
Encryption/decryption ready status
0
1
Encryption/decryption in progress
Encryption/decryption is completed
2:1
CMD[1:0]
R/W
Command to be performed when a 1 is written to ST.
00
01
10
11
encrypt block
decrypt block
load key
load IV/nonce
0
ST
0
R/W1
H0
Start processing command set by CMD. Must be issued for each command or
128 bits block of data. 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.
SWRS033E
Page 150 of 239
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
