Mismatched Length RX Frame

For Ethernet frames with payload sizes ≤ 1500, the Ethernet 10G MAC core cross-checks the physical frame length against its ETHERTYPE/LEN field. If the physical frame length mismatched the value in the field, it is flagged as an RX frame with a mismatched length. When this occurs, the Ethernet 10G MAC core asserts RX_AXI_TUSER and increments the RX statistic reporting, cnt_rx_frame_mismatched_length. Figure 1 describes a RX frame with mismatched length.