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Found 2 results

  1. 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?
  2. Hi all, I'm about to buy a Pro to replace an existing Spartan 6 design. I'd like to have a 4 digit 7 segment LED display and 8 toggle switches. The LogicStart MegaWing looks just right but I have one problem. I need 6 free pins (not including ground) for 3 instantiated uarts but the MegaWing uses every pin on the Pro so I am out of luck. Does anyone have a recommendation for how I can get my LED display, toggle switches and free pins? I can always connect the display and switched off board but will purchase existing products if possible. Thanks, Mr Minix