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Altera_Forum
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13 years ago

cyclone III configuration chain problem

Hi, I have two EP3C25Q240 cyclone III fpgas on my board with the EPCS16 configuration device. The system is set up for multi device AS configuration as per figure 9-4 in the cyclone device ha...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Hi,

again - thanks for your input. I now know what the issue was. I believe that U18 was causing too much delay so the enable was not enabled until 1 clock too late and hence it always failed to config. Changing U18 to a direct through path with pull up to 2V6 solved the problem.

Best regards

Gary