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What was the I/O standard you assigned to IO_CLKOUT1?
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The I/O standard is 2.5V.
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You can probably configure one of those signals as a single-ended clock, and then directly connect the single-ended output on J18 to the SMA J14.
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How can I do this?
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Check with a scope for reflections. If things look ugly, put a 50-ohm source termination on J18 before you attach the SMA cable. It'll drop the voltage by half.
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How to put the source termination on the J18? Sorry, I am not an electronic guy so this basic stuff is also new to me.
Well, I just think of driving out the reference clock from one of the three generators dedicated to XCVR blocks (100, 644.25, 706.53Mhz). These are differential clocks and we can drive those to J16, J17. Especially, the clock 100Mhz can be used for system clock instead of using S4GT_CLK1 (U21). How do you think about this?
Thanks.
Honored Contributor
