Triple-Speed Ethernet Intel® FPGA IP User Guide

ID 683402
Date 11/25/2022

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Document Table of Contents Interpacket Gap Insertion

In full-duplex mode, the MAC function maintains the minimum number of IPG configured in the tx_ipg_length register between transmissions. You can configure the minimum IPG to any value between 64 and 216 bit times, where 64 bit times is the time it takes to transmit 64 bits of raw data on the medium.

In half-duplex mode, the MAC function constantly monitors the line. Transmission starts only when the line has been idle for a period of 96 bit times and any backoff time requirements have been satisfied. In accordance with the standard, the MAC function begins to measure the IPG when the m_rx_crs signal is deasserted.