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Altera_Forum's avatar
Altera_Forum
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15 years ago

Will Quartus II automatically instantiate altclkctrl for any clock?

For an external clock CLKIN from a CYCLONE III clock pin, do I have to instantiate altclkctrl explicitly in VHDL so that CLKIN can be routed to global clock network? or Quartus II will do it automatically and implicitly?

What about an internally generated clock - from a frequency divider/counter, not PLL?

3 Replies

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

    it will be done automatically. check your Fitter report in the Resources section to see what Quartus has promoted to Global signals. you can also use the Assignment Editor to place specific signals onto Globals