58.6.1 ICM Configuration Register

This register can only be written if the WPEN bit is cleared in the ICM Write Protection Mode Register.

Name:	ICM_CFG
Offset:	0x00
Reset:	0x00000000
Property:	Read/Write


Bit	31	30	29	28	27	26	25	24

Access
Reset


Bit	23	22	21	20	19	18	17	16

Access
Reset


Bit	15	14	13	12	11	10	9	8
	UALGO[2:0]			UIHASH			DUALBUFF	ASCD
Access	R/W	R/W	R/W	R/W			R/W	R/W
Reset	0	0	0	0			0	0


Bit	7	6	5	4	3	2	1	0
	BBC[3:0]					SLBDIS	EOMDIS	WBDIS
Access	R/W	R/W	R/W	R/W		R/W	R/W	R/W
Reset	0	0	0	0		0	0	0

Bits 15:13 – UALGO[2:0] User SHA Algorithm

Value	Name	Description
0	SHA1	SHA1 algorithm processed
1	SHA256	SHA256 algorithm processed
4	SHA224	SHA224 algorithm processed

Bit 12 – UIHASH User Initial Hash Value

Value	Description
0	The secure hash standard provides the initial hash value.
1	The initial hash value is programmable. Field UALGO provides the SHA algorithm. The ALGO field of the ICM_RCFG structure member has no effect.

Bit 9 – DUALBUFF Dual Input Buffer

Value	Description
0	Dual Input Buffer mode is disabled.
1	Dual Input Buffer mode is enabled (better performances, higher bandwidth required on system bus).

Bit 8 – ASCD Automatic Switch To Compare Digest

Value	Description
0	Automatic monitoring mode is disabled.
1	The ICM passes through the Main List once to calculate the message digest of the monitored area. When WRAP = 1 in ICM_RCFG, the ICM begins monitoring.

Bits 7:4 – BBC[3:0] Bus Burden Control

This field is used to control the burden of the ICM system bus. The number of system clock cycles between the end of the current processing and the next block transfer is set to 2^BBC. Up to 32,768 cycles can be inserted.

Bit 2 – SLBDIS Secondary List Branching Disable

Value	Description
0	Branching to the Secondary List is permitted.
1	Branching to the Secondary List is forbidden. The NEXT field of the ICM_RNEXT structure member has no effect and is always considered as zero.

Bit 1 – EOMDIS End of Monitoring Disable

Value	Description
0	End of Monitoring is permitted.
1	End of Monitoring is forbidden. The EOM bit of the ICM_RCFG structure member has no effect.

Bit 0 – WBDIS Write Back Disable

When ASCD is set, WBDIS has no effect.

Value	Description
0	Write Back operations are permitted.
1	Write Back operations are forbidden. Context register CDWBN bit is internally set to one and cannot be modified by a linked list element. ICM_RCFG.CDWBN has no effect.