Visible to Intel only — GUID: bhc1411020280758
Ixiasoft
Visible to Intel only — GUID: bhc1411020280758
Ixiasoft
16.4. Handling of Avalon-ST Video Control Packets and User Packets
Some applications may repeat and drop the user packets together with their associated frame. For example, if the packets contain frame-specific information such as a frame ID.
- The IP core consequently handles and propagates mislabeled frames. Use this feature in a system where you cannot drop a frame. The latency introduced during the buffering could provide enough time to correct the invalid control packet.
- The buffering and propagation of image data packets incompatible with preceding control packets is an undesired behavior in most systems. Dropping invalid frames is often a convenient and acceptable way of dealing with glitches from the video input.
You can parameterize the Frame Buffer II IP core to drop all mislabeled fields or frames at compile time.
- Set the user packet affinity bit (bit 1) of the Misc. register.
- Turn on Drop invalid frames parameter.
Turn on the Frame repeating parameter to guarantee that reader keeps on repeating the last valid received frame— freezes the output—when the input drops.
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