Normal Frame Receive - 1.5 English

Versal Devices Integrated 100G Multirate Ethernet MAC Subsystem Product Guide (PG314)

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1.5 English

In the following figure, a typical sequence of frame transmits are shown. As before, Segments 2 through 4 have been omitted to keep the diagram compact. This figure depicts the same sequence of events similar to the previous segmented transmit example, but in the receive direction.

Figure 1. AXI4-Stream Segmented Normal Frame Receive

As in the earlier example, Frame A starts in Segment 0 of cycle #4 which terminates with EOF in Segment 1 of cycle #5. Frame B begins in Segment 5 of the same cycle, which ends in Segment 5 of cycle #7.

There is no bus activity in cycle #8, therefore the MRMAC deasserts rx_axis_tvalid_0 for the cycle. A new frame, Frame C, begins in cycle #9 and ends in cycle #11. Cycle #12 is idle (tvalid = 0) and the final frame in this example is transferred starting in cycle #13, Segment #1.