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Altera_Forum's avatar
Altera_Forum
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15 years ago

EP3C25 nStatus 1V

I have five EP3C25 borad, 3 of them are working well. But the rest 2 will sometimes boot fail. The working mode is AS or fast AS from EPCS4. There're 10K pull up on nStatus, nConfig, Conf_done, MSELs...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

nStatus is open drain so the actual voltage doesn't matter that much, as long as the absolute maximum ratings are applied. It looks like a hardware failure. When you say same voltage, do you mean that you supply VCCA with 3V? It is supposed to be 2.5V (and it is the same for the MSEL pins by the way).