Video and Image Processing Suite User Guide

ID 683416
Date 2/12/2021

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2.4. Avalon-ST Video Error Cases

The Avalon-ST protocol accepts certain error cases.

If a video packet has a different length to the one implied by the preceding control packet’s height, width and interlacing fields, it is termed as an early end of packet or late end of packet. All the VIP IP cores are able to accept this type of erroneous video, but the resultant output video may exhibit cropped or stretched characteristics. For example, the Deinterlacer II IP core has an integral stream cleaner which allows it to accept such packets when configured in complex motion adaptive modes.

If an Avalon-ST Video packet violates the Avalon-ST protocol in some way, for example by not raising startofpacket or endofpacket, this is a more serious error case and often results in a video pipeline locking up due to a freeze of the Avalon-ST bus.