NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 976 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
AES Feedback x Register (CRPT_AES_FDBCKx)
Register
Offset
R/W
Description
Reset Value
CRPT_AES_FDBCK0
0x050
R
AES Engine Output Feedback Data after
Cryptographic Operation
0x0000_0000
CRPT_AES_FDBCK1
0x054
R
AES Engine Output Feedback Data after
Cryptographic Operation
0x0000_0000
CRPT_AES_FDBCK2
0x058
R
AES Engine Output Feedback Data after
Cryptographic Operation
0x0000_0000
CRPT_AES_FDBCK3
0x05C
R
AES Engine Output Feedback Data after
Cryptographic Operation
0x0000_0000
31
30
29
28
27
26
25
24
FDBCK
23
22
21
20
19
18
17
16
FDBCK
15
14
13
12
11
10
9
8
FDBCK
7
6
5
4
3
2
1
0
FDBCK
Bits
Description
[31:0]
FDBCK
AES Feedback Information
The feedback value is 128 bits in size.
The AES engine uses the data from CRPT_AES_FDBCKx as the data inputted to
CRPT_AESn_IVx for the next block in DMA cascade mode.
The AES engine outputs feedback information for IV in the next block
’s operation.
Software can use this feedback information to implement more than four DMA channels.
Software can store that feedback value temporarily. After switching back, fill the stored
feedback value to this register in the same channel operation, and then continue the
operation with the original setting.