...sorry message got truncated.....
Making this change to the model, gets it running (but still not calculating the correct CRC). But now I'm wondering if I should just be using the EXTCRC mode, or whether there is an issue with the simulation model and/or hardware?
Can anyone shed any light?
I believe that there is a stock CRC component for UART. Also, UART Rx is typically slow (115kbd) and involves some interrupt processing anyway, so simple software implementation might suffice for CRC check.