F-Tile Ethernet Intel® FPGA Hard IP User Guide

ID 683023
Date 1/07/2022
Public

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4.2.1.4. 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.

CAUTION:
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.