HDMI Customization

[cassini]

Hey all,

I tried out the HDMI demo projects with Vivado for my ARTY Z7 board and now want to extend them to create a passthrough design or run some basic image processing. I had a look into the design files but found it hard to comprehend the rgb2dvi function for example (how multiplexing between data and control / blanking period is done), since there is only a synthesized netlist available.

How to go on with analyzing this interface?

Is there an interface timing diagram/waveform available, which I did miss or do I have to use a debug core?

Im not new to FPGA but SoC design and curently do not know how to generate stimuli for the whole design with the PS to run a simulation.

Maybe you notice I have several questions and actually do not know which is the best way to continue. It would be great to have some kind of hands-on advices how you would go on with such a design, so I can explore it further by myself.

Thank you very much!

[jpeyron]

Hi @cassini,

I do not have a lot of experience with HDMI projects. I have reached out to more experienced engineers about your forum thread to see if they have any input for you. Have you looked through the DVI2RGB documentation here?

thank you,

Jon

[elodg]

Quote

I had a look into the design files but found it hard to comprehend the rgb2dvi function for example... since there is only a synthesized netlist available.

DVI/HDMI is not easy. Which is the reason why we provide both an input and an output ip over at https://github.com/Digilent/vivado-library . You may re-use them without the need to understand the exact implementation. Or you can look at the source files, since we do provide the VHDL. A user guide is also available at the same location.

To understand the protocol itself, read the specs. For example: http://www.cs.unc.edu/~stc/FAQs/Video/dvi_spec-V1_0.pdf

I do admit that our DVI IPs are missing testbenches, so I cannot help with simulations. However, dvi2rgb has an ILA debug module option that can help you to look at signals.