1. A transmitter for use in a physical coding sublayer (PCS) of a network transceiver, the transmitter comprising: a polynomial register configured to store a user-defined polynomial; and a pseudorandom bit sequence (PRBS) generator including: a matrix circuit coupled with the polynomial register to receive the user-defined polynomial, the matrix circuit configured to generate a P-matrix based on the user-defined polynomial; a data register configured to receive a seed vector; and a multiplier coupled with the matrix circuit and the data register, the multiplier configured to generate a PRBS signal based on the P-matrix and based on data stored in the data register.