22.8.2 CRC Control

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


Bit	15	14	13	12	11	10	9	8
	CRCMODE[1:0]		CRCSRC[5:0]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	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 15:14 – CRCMODE[1:0] CRC Operating Mode

These bits define the block transfer mode.

Value	Name	Description
0x0	DEFAULT	Default operating mode
0x1	-	Reserved
0x2	CRCMON	Memory CRC monitor operating mode
0x3	CRCGEN	Memory CRC generation operating mode

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

These bits select the input source for generating the CRC. 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	DISABLE	No action
0x01	IO	I/O interface
0x02 - 0x1F	-	Reserved
0x20	CH0	DMA channel 0
0x21	CH1	DMA channel 1
0x22	CH2	DMA channel 2
0x23	CH3	DMA channel 3
0x24	CH4	DMA channel 4
0x25	CH5	DMA channel 5
0x26	CH6	DMA channel 6
0x27	CH7	DMA channel 7
0x28	CH8	DMA channel 8
0x29	CH9	DMA channel 9
0x2A	CH10	DMA channel 10
0x2B	CH11	DMA channel 11
0x2C	CH12	DMA channel 12
0x2D	CH13	DMA channel 13
0x2E	CH14	DMA channel 14
0x2F	CH15	DMA channel 15
0x30	CH16	DMA channel 16
0x31	CH17	DMA channel 17
0x32	CH18	DMA channel 18
0x33	CH19	DMA channel 19
0x34	CH20	DMA channel 20
0x35	CH21	DMA channel 21
0x36	CH22	DMA channel 22
0x37	CH23	DMA channel 23
0x38	CH24	DMA channel 24
0x39	CH25	DMA channel 25
0x3A	CH26	DMA channel 26
0x3B	CH27	DMA channel 27
0x3C	CH28	DMA channel 28
0x3D	CH29	DMA channel 29
0x3E	CH30	DMA channel 30
0x3F	CH31	DMA channel 31

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

These bits select the CRC polynomial type.

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