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Altera_Forum's avatar
Altera_Forum
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10 years ago

It is worse to assign clock on different bank or on non-clock input pin?

Hi,

I need to get four RGMII interfaces on HSMC attachment board and I have found that only 3 clock inputs are on the same bank as data lines.

RGMII is only 125MHz so there is possibility that it could work on non-clock pin..

I have therefore two options:

1, Route clock on non-clock pins

2, Route clock on different bank but on clock input pin.

Which has better chance to success?

Thank you.

2 Replies

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

    I would recommend using option# 2 which would have higher chance to pass Fitter compilation. You can create a simple test design and let it run through Quartus II compilation to see if there is any error or critical warning to further verify the implementation.

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

    Yeap... option# 2 would sound more reasonable...

    dedicated clock pin would mean you would have better access to the clock lines in the HSSI.