24.6.2 CRC Control

Name:	CRCCTRL
Offset:	0x02
Reset:	0x0000
Property:	PAC Write-Protection, Enable-Protected


Bit	15	14	13	12	11	10	9	8
			CRCSRC[5:0]
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
					CRCPOLY[1:0]		CRCBEATSIZE[1:0]
Access					R/W	R/W	R/W	R/W
Reset					0	0	0	0

Bits 13:8 – CRCSRC[5:0] CRC Input Source

These bits select the input source for generating the CRC, as shown in the table below. The selected source is locked until either the CRC generation is completed or the CRC module is disabled. This means the CRCSRC cannot be modified when the CRC operation is ongoing. The lock is signaled by the CRCBUSY status bit. CRC generation complete is generated and signaled from the selected source when used with the DMA channel.

Value	Name	Description
0x00	NOACT	No action
0x01	IO	I/O interface
0x02-0x1F	-	Reserved
0x20	CHN0	DMA channel 0
0x21	CHN1	DMA channel 1
0x22	CHN2	DMA channel 2
0x23	CHN3	DMA channel 3
0x24	CHN4	DMA channel 4
0x25	CHN5	DMA channel 5
0x26	CHN6	DMA channel 6
0x27	CHN7	DMA channel 7
0x28	CHN8	DMA channel 8
0x29	CHN9	DMA channel 9
0x2A	CHN10	DMA channel 10
0x2B	CHN11	DMA channel 11

Bits 3:2 – CRCPOLY[1:0] CRC Polynomial Type

These bits define the size of the data transfer for each bus access when the CRC is used with I/O interface, as shown in the table below.

Value	Name	Description
0x0	CRC16	CRC-16 (CRC-CCITT)
0x1	CRC32	CRC32 (IEEE 802.3)
0x2-0x3		Reserved

Bits 1:0 – CRCBEATSIZE[1:0] CRC Beat Size

These bits define the size of the data transfer for each bus access when the CRC is used with I/O interface.

Value	Name	Description
0x0	BYTE	8-bit bus transfer
0x1	HWORD	16-bit bus transfer
0x2	WORD	32-bit bus transfer
0x3		Reserved