Forum Discussion
Altera_Forum
Honored Contributor
11 years agoHSMC_REF_CLK is a differential clock. You mention pin 9, but that's only the _p net. The _n net goes to pin 8. I'm guessing you know this - just want to eliminate the obvious.
Also, there are series resistors on the _p/_n clock nets (R266 and R271). If you have an oscilloscope you can probe the clock on one of those resistors and see if it's active. If it is active then the problem is on your side of things.