AS_Cryptographic co-processor (C3)
RM0082
394/844
Doc ID 018672 Rev 1
Bits 28 to 26 - Mode of operation (MODE)
These 3 bits represent the mode of operation, as in the following internal representation. For
writing this field the bit #2 of the input word has to be set to 1.
Bit 25 - Key ready (KEYRDY)
This bit indicates if the key value is valid or not. For writing this field the bit #1 of the input
word has to be set to 1.
Bits 24 to 23 - Context Save/Restore (CTX_SR)
These 2 bits represent the operation to do with the context, as in the following internal
representation. For writing this field the bit #0 of the input word has to be set to 1.
Bit 30 to 29
Description
2’b00
128 bits
2’b01
192 bits
2’b10
256 bits
2’b11 Not
Used
Bit 28 to 26
Description
3’b000
ECB
3’b001
CBR
3’b010
CTR
3’b011
Not Used
3’b100
Not Used
3’b101
Not Used
3’b110
Not Used
3’b111
Not Used
Bit 25
Description
1’b1
The Key value is NOT ready
1’b0
The Key value is ready
Bit 30 to 29
Description
2’b00
None
2’b01
Context restore
2’b10
Context Save
2’b11
Not Used