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

DDR differential pin assignments

I instantiated a DDR3 hard IP and compiled it. Certain pin such as MEM_CK and MEM_CKN are considered differential pairs and Quartus labeled them as "Differential 1.5V-SSTL". But instead of labeling...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Nevermind. I figured it out. Just back-annotate in pin planner then edit the qsf by hand.

  • MStof1's avatar
    MStof1
    Icon for New Contributor rankNew Contributor
    5 years ago

    I'm having the same problem. However, I am not able to back-annotate - it's grayed out. How do I get rid of these extra signals? I have the signals I want connected to pins, but the pin planner doesn't consider them to be differential pairs eve though the I/O standard shows them as differential.