Article ID: 000084195 Content Type: Troubleshooting Last Reviewed: 01/01/2015

Can I connect unused GXB_RX pins to GND in Arria V and Cyclone V devices?

Environment

  • Arria® V GT FPGA
  • Cyclone® V GT FPGA
  • Arria® V ST SoC FPGA
  • Arria® V GX FPGA
  • Cyclone® V GX FPGA
  • Arria® V SX SoC FPGA
  • Cyclone® V SX SoC FPGA
  • Cyclone® V ST SoC FPGA
  • Quartus® II Subscription Edition
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    Description

    Yes, you can connect unused GXB_RX pins in Arria® V and Cyclone® V devices directly to GND. 

    The Cyclone V Device Family Pin Connection Guidelines (PDF) version 1.0 and Arria V Device Family Pin Connection Guidelines (PDF) version 1.1 state unused GXB_RX pins should be tied to GND through a 10-k. resistor.  This guideline can still be followed, however, for a more simple board layout, you can tie unused GXB_RX pins directly to GND without the use of a pull down resistor.

    Resolution

    Future versions of the Arria V and Cyclone V Pin Connection Guidelines will be updated to state the unused GXB_RX pins can be tied directly to GND.

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