F-Tile Ethernet Intel® FPGA Hard IP User Guide

ID 683023
Date 10/04/2021

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Document Table of Contents Frame Padding

When the length of client frame is less than 64 bytes and greater than eight bytes, the TX MAC module inserts pad bytes after the payload to create a frame length equal to the minimum size of 64 bytes. If the i_tx_skip_crc or i_tx_mac_skip_crc signal is asserted while writing frame data, the core does not insert PAD bytes even if the frame is shorter than 64 bytes long.

The F-Tile Ethernet Intel® FPGA Hard IP drops client frames of less than nine bytes because it cannot transfer the frames to the F-tile. You must ensure such frames do not reach the TX client interface.