Me and my college are first time users of programming a FPGAs. We have bought the already assembled card Xylo-L from knjn. It has a Spartan-3E FPGA among other parts. Somewhere during the process of handling this card something has gone wrong and now when we connect power to the card it gets really hot fast. We can still put in some simple functions into the FPGA, e.g. we can make a couple of LED glow and blink. This must mean that the FPGA is not totally crashed. We have tested to reset the card with the USB cable that's connected to the card. When be put 3,3V to the card there is a current of about 900mA to the card, which is plenty when we expect at most 300mA. We would be very happy if anyone can give us some idea of what's wrong and/or how we can test our card to find the problem, or maybe how to reset the card completely.
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> This must mean that the FPGA is not totally crashed. My assumption is that you have destroyed the FPGA partially. > or maybe how to reset the card completely. After a power turn-off-turn-on cycle the FPGA is reset. Then it starts to load the configuration bitstream out of the config PROM (depends on the MODE pins). So just erase the config PROM and switch power off and on again....
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>> This must mean that the FPGA is not totally crashed. > My assumption is that you have destroyed the FPGA partially. Is there any way to find out what parts are broken? >> or maybe how to reset the card completely. > After a power turn-off-turn-on cycle the FPGA is reset. Then it starts > to load the configuration bitstream out of the config PROM (depends on > the MODE pins). So just erase the config PROM and switch power off and > on again.... We have tested this with no change to the FPGA. We are suspecting that there are suppose to be a "deeper" reset somewhere. Maybe we need to use JTAG to reach it.
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> Maybe we need to use JTAG to reach it. A S3 FPGA is just a piece of silicon after power up. It is completly like new. There is absolutely no kind of memory in it, so there is nothing to reset... > there are suppose to be a "deeper" reset somewhere. No, its much simpler: your FPGA is (at least half) dead :-(
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