NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 998 -
Revision V1.30
NUC97
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CHNIC
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SHA/HMAC Key Byte Count Register (CRPT_HMAC_KEYCNT )
Register
Offset
R/W Description
Reset Value
CRPT_HMAC_KEYCNT
0x348 R/W SHA/HMAC Key Byte Count Register
0x0000_0000
31
30
29
28
27
26
25
24
KEYCNT
23
22
21
20
19
18
17
16
KEYCNT
15
14
13
12
11
10
9
8
KEYCNT
7
6
5
4
3
2
1
0
KEYCNT
Bits
Description
[31:0]
KEYCNT
SHA/HMAC Key Byte Count
The CRPT_HMAC_KEYCNT keeps the byte count of key that SHA/HMAC engine operates.
The register is 32-bit and the maximum byte count is 4G bytes. It can be read and written.
Writing to the register CRPT_HMAC_KEYCNT as the SHA/HMAC accelerator operating
doesn’t affect the current SHA/HMAC operation. But the value of CRPT_SHA _KEYCNT will
be updated later on. Consequently, software can prepare the key count for the next
SHA/HMAC operation.