F-Tile Ethernet Intel® FPGA Hard IP User Guide

ID 683023
Date 12/19/2022
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

4.2.3.2. Conditions Triggering XON Frame Transmission

The TX MAC transmits PAUSE or PFC XON frames when one of the following conditions occurs:

  • Client requests XON transmission—A client can explicitly request that XON frames be sent using the pause control interface signal. When i_tx_pause is deasserted, a PAUSE XON frame is sent to the Ethernet network when the current frame transmission completes. Similarly, when i_tx_pfc[n] is deasserted, a PFC frame is sent with a PFC XON message for queue n. If multiple PFC queues are deasserted, the TX MAC will pack the requests into the same PFC packet if possible.
  • Host (software) requests XON transmission—Resetting the pause request register triggers a request that an XON frame be sent.