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xilinx-gloh
Visitor
Visitor
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Registered: ‎11-13-2019

GTH short circuit protection

Kintec Ultrascale KU060. Is the GTH Tx output short circuit protected?

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jhua
Xilinx Employee
Xilinx Employee
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Registered: ‎06-01-2017

Please refer to UG576 v1.6 Page 336. Unused TX pins should be left unconnected. In addition, the transmitter should be AC coupled.

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Thanks,
Jessica
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xilinx-gloh
Visitor
Visitor
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Registered: ‎11-13-2019

Thank you for response. I was aware of this recommendation, but we use the GTH as an output external to a unit. So we have the possibilities to ac-couple at both sides Tx and Rx, or only once in the link.

If both sides are ac-coupled a dedicated drain resistor is needed to avoid floating static charging. But this implementaion is not easy to apply at higher data rates.

If only one side is ac-coupled the posibility of short circuit Tx or Rx to GND is a potential risk. Therefore my question, what the consequence is in case of a short circuit.

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jhua
Xilinx Employee
Xilinx Employee
338 Views
Registered: ‎06-01-2017

Hi @xilinx-gloh 

If you have a DC blocking cap between the TX output and GND, there is no issue.

Thanks,
Jessica
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