cnt_rx_frame_undersized

The statistic cnt_rx_frame_length reports the number of RX frames with payload size < 46 for the non-VLAN tagged frames, or < 42 for VLAN tagged frames. This statistic updates at a clock cycle after the end of the frame. Figure 1 shows the cnt_rx_frame_undersized statistic updates relative to the RX frames at the AXI ST interface.

When this statistic register increments, the RX statistic registers, cnt_rx_mismatched_length and cnt_rx_frame_error_fcs remain unchanged.

Note: The RX_AXI_TUSER is asserted to 1 as described in Undersized RX Frame.
Figure 1. RX Statistic – Undersized RX Frame