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Global clock pin levels

Reymon

Hi.

I am designing my own custom carrier board to support the UltraZed-EG SOM. I what to include two Global Clocks conected to GC diferential pair pins (e.g. JX1_HP_DP_36_GC_P, JX1_HP_DP_36_GC_N ). The question is, what are the voltage levels and frequecies acepted by GC pins?.

  • 0

    You probably want to make those clock inputs LVDS.  Then just use an LVDS oscillator or clock buffer. I think you can go up to 400MHz on those clock inputs but there is usually no reason to go so high.  The MMCM clock synthesizer can generate almost any frequency you need.

    Check the datasheets of course.  I also like to compile an almost complete design to make sure I have respected the clocking and IO placement rules.