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Visitor wideswath
Visitor
3,630 Views
Registered: ‎04-20-2017

Unused MGT Pins

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I reviewed UG576 and UG578 for recommendations on unused MGTs and from those documents discerned that if I'm not using any MGTs at all, then I should do the following:

 

1) Leave all MGTAVCC, MGTAVTT, MGTVCCAUS, MGTREFCLK, MGTHTX and MGTHRX unconnected.

2) Ground all MGTRREF and MGTAVTTRCAL

 

Can anyone verify this is the correct approach?  I don't think it matters, but I'm using the KU060.

 

Thanks.

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Xilinx Employee
Xilinx Employee
6,081 Views
Registered: ‎02-14-2014

Re: Unused MGT Pins

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Hello @wideswath,

 

For the power supply pins MGTAVCC, MGTAVTT and MGTAVCCAUX of unused MGTs, you can either leave them unconnected (which you are doing) or tie to GND only if RCAL circuit is not present in that Quad. 

For MGTHTX and MGTREFCLK pins, you can safely leave them unconnected.

For MGTHRX pins, there is special condition mentioned in UG depending on whether GT is instanced in the design or not. Make sure this condition is being followed.

MGTRREF and MGTAVTTRCAL should be tied to GND as you have mentioned.

Regards,
Ashish
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Xilinx Employee
Xilinx Employee
6,082 Views
Registered: ‎02-14-2014

Re: Unused MGT Pins

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Hello @wideswath,

 

For the power supply pins MGTAVCC, MGTAVTT and MGTAVCCAUX of unused MGTs, you can either leave them unconnected (which you are doing) or tie to GND only if RCAL circuit is not present in that Quad. 

For MGTHTX and MGTREFCLK pins, you can safely leave them unconnected.

For MGTHRX pins, there is special condition mentioned in UG depending on whether GT is instanced in the design or not. Make sure this condition is being followed.

MGTRREF and MGTAVTTRCAL should be tied to GND as you have mentioned.

Regards,
Ashish
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Give Kudos to a post which you think is helpful and reply oriented.
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Visitor wideswath
Visitor
3,611 Views
Registered: ‎04-20-2017

Re: Unused MGT Pins

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Thank you for the reply.  I read the note on the RCAL.  Since I'm grounding all RCAL pins, is it ok to leave the power pins all NC as I have?  Thank you.

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Xilinx Employee
Xilinx Employee
3,606 Views
Registered: ‎02-14-2014

Re: Unused MGT Pins

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Hello @wideswath,

 

Yes power pins can be left unconnected in that case

Regards,
Ashish
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