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Altera_Forum
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9 years ago

Cyclone III Configuration Problem

I completed a design using a Cyclone III EP3C5F256C8N back in 2013. We have been shipping the board with no problems until now. The last batch of 50 boards we built all have the same problem, in whic...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Still sounds to me like CONF_DONE is the problem. If the 10k pullup is in place and tied to +3.3V then the only possibility is that the line is being held low by something. Where all does CONF_DONE go on the board? Just the AVR? Is it possible that the AVR is holding the line low? Anything else? What is the resistance from CONF_DONE to GND?