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Altera_Forum
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8 years ago

Unused Transceiver Pins Not Connected to ground

Hello, quick question for the members of the forum. I designed a board using a Cyclone V GX FPGA. I did not use the transceiver pins so I ground all the RX pins and left the TX pins floating. During ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Pin connection guidelines say connect GXB_RX pins to ground through 10k resistor, either individually or all together. Short traces are suggested.

Sounds like they'll possibly pick up noise, making the receiver stage switching unintended. I don't expect design failure, but may be increased power consumption or some noise coupled to other near by GXB signals.