31.2.7.7 CRC Example Configurations

The following table shows an example CRC configuration with a polynomial size of 32. For each term (xn) of the polynomial used, a corresponding bit in the CRCPOLY Register is set to ‘1’. This polynomial implements CRC-32-IEEE 802.3.

Table 31-5. Example 32-Bit Polynomial CRC Setup
Field NameBit ValueDescription
CRCMODE.PLEN321Polynomial Length is 32-bits
CRCPOLY 
0000 0100 1100 0001 0001 1101 1011 011-
CRC polynomial:

x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x + 1

The following table shows an example CRC configuration with the polynomial size of 16. The value of CRCPOLY shows the 12th bit and the 5th bit set to ‘1’, as required by the equation. The 0th bit required by the equation is always XOR'd.

Table 31-6. Example 16-Bit Polynomial CRC Setup
Field NameBit ValueDescription
CRCMODE.PLEN320Polynomial Length is 16-bits
CRCPOLY 
0000 0000 0000 0000 0001 0000 0010 000-
CRC polynomial:

x16 + x12 + x5 + 1