Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

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The Cyclic Redundancy Check Calculation Unit (CRCCU) has its own DMA which functions as a Master with the 

Bus Matrix. Three different polynomials are available: CCITT802.3, CASTAGNOLI and CCITT16. 
The CRCCU is designed to perform data integrity checks of off-/on-chip memories as a background task wthout 

CPU intervention. 

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Data Integrity Check of Off-/On-Chip Memories

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Background Task Without CPU Intervention

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Performs Cyclic Redundancy Check (CRC) Operation on Programmable Memory Area

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Programmable Bus Burden

Note:

The CRCCU is designed to verify data integrity of off-/on-chip memories, thus the CRC must be generated and verified 

by the CRCCU. The CRCCU performs the CRC from LSB to MSB. If the CRC has been performed with the same 

polynomial by another device, a bit-reverse must be done on each byte before using the CRCCU.