22.3.6 CRC

Optionally, Cyclic Redundancy Checking can be enabled using the CRCLEN bits within BiCLTCONx for data channels and control channels. This is one way to help determine if any issue has occurred during transmission. To implement this function, a checksum is calculated from the desired transmission and then converted into its CRC value. This value can then be checked during transmission to determine if any issues have already occurred. Depending on what CRC (Data Channel or Control) is being transmitted determines where in the protocol these values will be transmitted. The type of CRC also determines how many bits are available. Up to 17 bits for Data Channel CRC and four bits for Control CRC. The length of the CRC data channel can be set in the CRCLEN bits within BiCLTCONx. Settings for CRC can be configured in the BiCLTCONx and BiCTRLCONx registers.

If there is sufficient free memory available for CRC data, the read and inverted CRC bits are stored beginning at the highest address downwards. The storage of the CRC can be disabled with NOCRC.