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ADV212 HIPI sv. Two DMA Channels

Question asked by GregMefford on May 4, 2011
Latest reply on May 4, 2011 by DaveD

Is HIPI the same thing as using two DMA channels?

My impression was that HIPI mode is where a set of pixels or chunk of JP2K code are written to, or read from, a register in normal host mode (which is slow).

 

Is it also possible to configure DMA channel 0 to burst raw pixel data in and DMA channel 1 to pull JP2K compressed data out of an ADV212 in encode mode? It seems like this could be set up to be very fast (50MHz x 32 bits = 1600Mbps total burst rate if you have a 32-bit interface, half that for 16-bit).

If this is possible, is blanking still required or do the same limitations apply that apply to the RAW Pixel interface? Is this just a bad idea?

 

Presumably the average throughput limitation would still be 65Msamples/sec for pixel input and 200mbit/sec for compressed output assuming a 150MHz JCLK and lossy compression.

 

For my application, I'm not worried about buffering the video for burst DMA instead of streaming pixels because I already have the video in raster-scan packets in an FPGA anyway.

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