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I've been working on a HDMI input wing, and have hit what looks to be a potential major snag. The TMDS input requires 50 ohm termination resistors to 3.3V on the differential inputs, at a "suitable distance" from the FPGA's pin. I am assumed that the rising edge is around 0.5ns for a 750Mb/s 1280x720p signal. That gives a 1/4th Transition Electrical Length is about 2cm, and using my trusty scrap of paper the trace from the chip to the top of the wing connector is about 5cm. So I am now worried that if I locate the termination that far from the FPGA it will adversely affect the signal integrity. Can anybody confirm if this worry is well founded or not?
OK, I am asking it as a hobbyist/novice. I have a great interest in such a converter. Also, what is the possibility of it going both ways? HDMI <-> VGA Component images & data: http://en.wikipedia.org/wiki/YPbPr