The following figure shows an Aurora 8B/10B core with a 4-byte data interface
receiving a 4-byte UFC message. The core presents this data to the user application
by asserting m_axi_ufc_rx_tvalid and
m_axi_ufc_rx_tlast to indicate a single cycle frame.
m_axi_ufc_rx_tkeep is set to 4'hF , indicating only the four
most significant bytes of the interface are valid.
Figure 1. Receiving a Single-Cycle UFC Message
