Article ID: 000079900 Content Type: Troubleshooting Last Reviewed: 02/04/2013

Can I connect unused GXB_REFCLK pins directly to GND in Cyclone® V GX devices?

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Quartus Edition

Quartus® II Subscription Edition

Version Found: 12.0

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Description Yes, you can connect unused GXB_REFCLK pins directly to GND in Cyclone® V GX. This is indicated in the Cyclone V Pin Connection Guidelines. However, a Quartus® II generated .pin file for this family indicates that an unused GXB_REFCLK pin should be connected to GXB_GND* (pulldown via a 10K ohm resistor). This is a bug in the Quartus II software and will be fixed in a future release.

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