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I'm making a little project purely as a hobby using a small FPGA breakout board. I'm outputting VGA video which works fine, but would like HDMI output instead so I can connect to a television that has that input but no VGA. I don't believe it's practical to generate HDMI directly from my FPGA board (correct me if I'm wrong.) so I was wondering if there was any encoder chip or board that doesn't cost too much that I could use in the project that takes VGA input (and possibly audio) and outputs a HDMI signal. I've not been able to find anything myself. Or is this impractical and I should settle for analog video instead.
EDIT: Basically I'm asking if there is any way to generate HDMI that's possible for a small personal FPGA project, the VGA part isn't necessary if there is another way. HDMI is just 'DVI with knobs on' on the video side.
As to 'can it be done'. My first question is 'what FPGA'? Some of them can create HDMI/DVI signals with the IO blocks, others just fundamentally can't. DVI uses signalling, which is an encoding on top of a Current Mode Logic (CML) differential pair. CML is actively pulled down by a current source for a '0' and floats high with a termination resistor at the far end for a '1'. It might be emulatable for a hobby project by using a bidirectional LVDS pair driven low and using the tristate line to drive and release (a bit like doing an open-drain drive).
Then you have to encode and serialise the data. TMDS describes how to encode the data bits, and then you you 'just' have to serialise the data bits across the data pairs. The specification can be found here - see section 3: The TFP410 chip data sheet also has a reasonable description of what goes on. I just found (). It converts VGA-compliant R/G/B and sync pulses into DVI, which basically uses the same signaling as HDMI. You'll need the ability to generate a reliable pixel clock, as well as to be able to send bits at 10x the pixel clock.
Intel Fpga Driver
Using an FPGA's DCM (digital clock manager) you should be able to accomplish this. I haven't had a chance to test this code myself (am in the process of adopting one of my VGA-based projects to try it) but it has worked fine for others. Edit: I was able to successfully integrate this into several of my VGA demo projects with little to no difficulty.
So I can personally attest to the fact that this works. Check out this development board from lattice.
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Install Vga Driver
They have a reference design that includes dvi in and dvi outputs as well as cameralink inputs and outputs. $189 It demonstrates using an lvds cameralink deserializer to drive a dvi output chip. Depending on your Fpga board you may be able to output the cameralink serialized video from your board then use this dev board to convert that to a dvi output.
Mac Vga Adapter
Or just use this board for the whole thing. If your budget is larger they have a nice Hd camera to hdmi output dev kit for $400.
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