Coolrunner output pins stuck at 0V

Nov 10, 2005 3 Replies
J

Maybe someone can make a suggestion:



I'm building a board with a Coolrunner XPLA3384 on it, however, my intitial (very very basic) test code is running into problems... The device is programmed and verified successfully, but all (configured) output pins remain at ground.



Pins not configured as outputs a pulled up by the internal pullup resistors, just as when the device is in an erased state. I'm using dedicated JTAG pins to configure the device



I've checked the power and ground pins, all are looking good, same goes for short circuits between the pins and ground...



I feel I'm missing something small - can anyone perhaps make a suggestion on where to look?



Thanks



johannes



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A

Does your test code toggle them or just set them high? Might be worth trying both. Does it work in the simulator? Are you using asynchronous set/clear, or global reset? Does that device have more than one clock source?

BTW I'm not familair with the Coolrunner.

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J

Downloading and installing SP4 from the Xilinx site eventually solved my problems...

johannes

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