Core-Initiated Response to a PFC request - 9.0 English

Tri-Mode Ethernet MAC LogiCORE IP Product Guide (PG051)

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9.0 English

An error-free control frame is a received frame matching the format of Figure 1. It must pass all standard receiver frame checks (for example, FCS field checking). In addition, the control frame received must be exactly 64 bytes in length (from destination address through to the FCS field inclusive (this is the minimum legal Ethernet MAC frame size and the defined size for control frames) or the Control Frame Length Check Disable must be set.

Any control frame received that does not conform to these checks contains an error and is passed to the receiver client with the rx_axis_tuser signal asserted on the cycle that rx_axis_tlast is asserted.