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Altera_Forum's avatar
Altera_Forum
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15 years ago

Adjustment of clock phase shift in source synchronous outputs

Hi,

simple question: is it possible to get Quartus to automatically adjust the phase shift of a clock at fitting time to meet required skew requirements on a source synchronous output bus?

I find that I have to constantly tweak the PLL megafunction to adjust the output clock phase shift until I can meet my timing. It would be nice if the fitter had some control over this. It's a pain since my test build and my full build require different phase shifts to account for differing delays in other unrelated logic.

Thanks,

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Unfortunately, it is not currently possible to do that. Altera Software is aware that this is something users would like to do, but it has not been a priority for them up to this point. Hopefully we will see that feature at some point in the future. For now, you have to manually change the clock phase.