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joe306
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Registered: ‎12-07-2018

MGT Clocks: Do I need More?

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Hello, I'm using a big Zynq Ultrascale+ MPSOC that has a lot of MGTH pins. I'm using three pairs tx/rx for three fiber transceivers and the other pins I am going to a expansion header. The spare MGTH pins have no immediate need but we put them to a header for future use Do I need to supply two clocks for each Quad?

Transceiver_Clocks.jpgTransceiver_Clocks2.jpg

 

 

Here is my programmable clock generator.

ClockGen.jpg

Should I add another clock generator and supply clocks to all the MGT Reference Clocks?

 

Thank you

Joe

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joancab
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Registered: ‎05-11-2015

Thank you for supposing I think. Feel flattered.

"At this time I don't know what I will do with those MGT pins"

That looks like pure research (what I'm doing when I don't know what I'm doing).

It looks like a dev or multi-purpose board (?). In that case I would have one/ several of these I2C-programmable multi-output clock generators (SiLabs has thousands) so you can have same or different frequencies, even disable the unused ones, etc.

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4 Replies
joancab
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Registered: ‎05-11-2015

Looking good that little beast.

One ref clock for all the MGTs in the quad or two, it depends on how you will use them.

joe306
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Registered: ‎12-07-2018

Hello and thank you for responding to my message. Yes, I was expecting that as answer. At this time I don't know what I will do with those MGT pins. If I make all the clocks the same frequency I could use a fanout buffer but that limits me. I guess I will break down and add in another clock generator device.

What do you think?

Thank you

Joe

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joancab
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Advisor
385 Views
Registered: ‎05-11-2015

Thank you for supposing I think. Feel flattered.

"At this time I don't know what I will do with those MGT pins"

That looks like pure research (what I'm doing when I don't know what I'm doing).

It looks like a dev or multi-purpose board (?). In that case I would have one/ several of these I2C-programmable multi-output clock generators (SiLabs has thousands) so you can have same or different frequencies, even disable the unused ones, etc.

View solution in original post

joe306
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Registered: ‎12-07-2018

Thank you very much.

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