The multioutput scalar reference design scales an input video stream to multiple output resolutions, as shown in Figure 1. The design uses time-division multiplexing of a single scaling engine and shares line buffers to implement multiple outputs at various resolutions reducing the hardware resources required. Video conferencing and multiviewer products are common applications where a single video source is scaled to multiple resolutions.
The reference design, shown in Figure 2, has four major functional blocks. The video input takes a single SDI input, checks that it is in a supported format, and then sends it to the line buffer components. The next video pipeline component takes the input video, produces the five output resolutions, and writes them to memory. The video output component reads the five output resolutions from external memory, mixes the outputs over a test pattern base layer, and sends the resulting video to the SDI output. The video pipeline components require much lower-level control as they only perform tasks, such as processing input packets, when they receive a command from the scheduler. The DDR3 SDRAM Controller with ALTMEMPHY and the multiport front end buffer the video to and from external DDR3 SDRAM. For more details, refer to the application note 4K Format Conversion Reference Design.
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