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Altera_Forum
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15 years ago

EP2 won't AS configure, nCONFIG stuck lo

EP2C5Q208 will not AS configure itself. Circuit is exactly as Fig. 13-7, page 13-20 in Cyclone2 Device Handbook, Vol. 1 for a single device. Configuration device is EPCS4. (Using USB Blaster Quart...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi Greg..

It sounds like you may have an issue with the layout on nCONFIG. If this pin is stuck low, JTAG programming would be able to complete, but it would instantly try to restart AS configuration. So your design would never run.

Pete