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TUSB7320 PCIe ref clock logic

TUSB7320 PCIe ref clock logic

This question is not answered
Sachin Kurawatti
Posted by Sachin Kurawatti
on Mar 09 2012 03:17 AM
Prodigy80 points

What I/O standard is prefered for TUSB7320 100MHz PCIe ref clock input?

Is it fine, if provided with 100MHz LVDS clock?

Regards,

Sachin

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  • ELIAS VILLEGAS
    Posted by ELIAS VILLEGAS
    on Mar 09 2012 12:35 PM
    Mastermind22975 points

    Hello Sachin,

    Yes, the PCI Express REFCLK+/- signal is a LVDS.

    It is described in detail on the PCI Express Card Electromechanical Specification Rev 1.1

    Regards.

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  • SACHIN KURAWATTI81378
    Posted by SACHIN KURAWATTI81378
    on May 03 2012 03:59 AM
    Prodigy100 points

    Hello Elias Villegas,

    Can I also use 100MHz HCSL clock for TUSB7320 REFCLK+/-?

    Regards,

    Sachin 

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  • ELIAS VILLEGAS
    Posted by ELIAS VILLEGAS
    on May 03 2012 14:06 PM
    Mastermind22975 points

    Hello Sachin,

    The main difference between the LVDS and HCSL are that HCSL support higher frequencies and more power than LVDS; so if you meet the electrical specs for the TUSB7340 it won't matter what signal type you use.

    I don't recommend HCSL due to its high voltage swing which is very close to the maximum input voltage of the TUSB7340. 

    Regards.

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