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Altera_Forum
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17 years ago

Conf_Done stays low after programming

Hi, I have a design on Cyclone III EP3C120F480C7 that works pretty well when the input clock frequency is low, but quits working when the frequency increases. The reason it quits working is bec...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Thank you all for your reply. Harald is right. My power supply was too weak. I guess when I increase the clock speed it demands even more power from the already weak supply. Here is a picture of my VCCINT. The green signal is VCCINT and the yellow signal is config_done:

http://img517.imageshack.us/img517/6336/work4qz1.th.png (http://img517.imageshack.us/my.php?image=work4qz1.png)http://img517.imageshack.us/images/thpix.gif (http://g.imageshack.us/thpix.php)