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Altera_Forum's avatar
Altera_Forum
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14 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
14 years ago

There's still one question. Will the MSEL pins be read after each nConfig toggle? If so, the problem may quite probably on the MSEL pins. Because I found that there were more failure occured on nConfig release than on POR. For several times the loading after POR was OK but then reset nConfig failed.