Allwinner A20 - Page 220

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 220 / 812
Offset: 0x00
Register Name: SS_CTL
Default Value: 0x0000_0000
Bit
Read/Write
Default
Description
Others: Reserved
18:16
R
x
DIE_ID
Die Bonding ID
15
R/W
0
PRNG_MODE
PRNG generator mode
0: One-shot mode
1: Continue mode
14
R/W
0
IV_MODE
IV Steady of SHA-1/MD5 constants
0: Constants
1: Arbitrary IV
Notes: It is only used for SHA-1/MD5 engine. If the number of
IV word is beyond of 4, Counter 0 register is used for IV4.
13:12
R/W
0
SS_OP_MODE
SS Operation Mode
00: Electronic Code Book (ECB) mode
01: Cipher Block Chaining (CBC) mode
10:/
11: AES Ciphertext Stealing (CTS) mode
11:10
/
/
/
9:8
R/W
0
AES_KEY_SIZE
Key Size for AES
00: 128-bits
01: 192-bits
10: 256-bits
11: Reserved
7
R/W
0
SS_OP_DIR
SS Operation Direction
0: Encryption
1: Decryption
6:4
R/W
0
SS_METHOD
SS Method
000: AES
001: DES