Data is supplied to the CRC module using the CRCDATA registers and can either be loaded manually or automatically by
using the scanner module. The length of the data word being supplied to the CRC module
is specified by the DLEN bits and can be configured for data words up to 32 bits
in length. The DLEN field indicates how many bits in the CRCDATA registers are valid and
any bits outside of the specified data word size will be ignored. Data is moved into the
CRCSHIFT registers as an intermediate to calculate the check value located
in the CRCOUT registers. The SHIFTM bit is used to determine the bit order of the data being shifted into
the accumulator and the bit order of the result.Figure 13-1. CRC Process
When the SHIFTM bit is not set, data will be shifted into the CRC, MSb first and the
result will be big-endian. When the SHIFTM bit is set, data will be shifted into the
accumulator in the reverse order (LSb first) and the result will be little-endian. The
CRC module can be seeded with an initial value by setting the CRCOUT registers to the
appropriate value before beginning the CRC process.
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