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EvanHamiltonJAVS's avatar
EvanHamiltonJAVS
Icon for New Contributor rankNew Contributor
2 years ago

Problem W/ Altera VIP Frame Buffer II

I have configured an FPGA design for my linux device that is displaying SDI and HMDI inputs. It was originally configured to receive YCbCr 4:2:2 video format. Since I am experiencing green spill on i...
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KianHinT_altera's avatar
KianHinT_altera
Icon for Frequent Contributor rankFrequent Contributor
2 years ago

Hi Evan,

From the team feedback, referring to the VIP user guide (https://www.intel.com/content/dam/support/us/en/programmable/support-resources/bulk-container/pdfs/literature/ug/archives/ug-vip-18-1.pdf) section 15.7 Motion Adaptive Mode Bandwidth Requirements

Screenshot (just in case you dont have access to the pdf link):

This is the consideration on the bandwidth requirements for video frame data based on deinterlacer, but it is the same process for the frame buffer as well.

Contrast this with the DDR configuration you have configured – width of data bus, DDR speed – use 90% of this figure to account for refresh and inefficiency through the EMIF. If your requirements exceed this 90% value, then this will be the problem. Certainly by changing from YCbCr to RGB this will consume 50% more bandwidth so it sounds highly likely this is the issue.

Thanks

Regards

Kian