FPGA Output Pin to Multiple Sinks

[mcetinsoy]

Hello,

When connecting FPGA pin to multiple sinks and configuring the pin as output what considerations should be made?

In my case, I want to connect the FPGA pin to two SP4T RF switches (PE42441) control lines.

I want to avoid using a fanout IC to achieve the below.

Which metrics (FPGA Output Current, IC Input Current) should I look for in the part datasheet?

Best Regards.

Mustafa

[borisq · Accepted solution]

hi @mcetinsoy

Please refer to "Unidirectional Multi-Drop Topographies" in PCB user guide for a specific FPGA family.

For example, if you are using 7 series FPGA, please look at UG483 page 50.

http://www.xilinx.com/support/documentation/user_guides/ug483_7Series_PCB.pdf

You may need to run ibis simulation to validate your design.

Thanks,

Boris