Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

Arrow SoCKit: HSMC_REF_CLK (100MHz) Not Working

@moderator: I found one other thread in this former that mentioned the HSMC_REF_CLK on the Arrow SoCKit and managed to post my question there, but (1) that was somewhat rude to hijack this persons th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

HSMC_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.