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I am not using the Arria II GX Transceiver (GXB), how should I handle the associated I/O pins?

Transceiver I/O pins
GXB_RX[n]p : Pull-down at 10kΩ
GXB_RX[n]n : Pull-down at 10kΩ
GXB_TX[n]p : Floating
GXB_TX[n]n : Floating
REFCLK[n]p : Pull-down with 10kΩ
REFCLK[n]n : Pull-down with 10kΩ
RREF[n] : Direct to GND

For details, please refer to the Arria II GX Pin Connection Guidelines.
 https://www.altera.com/en_US/pdfs/literature/dp/arria-ii-gx/pcg-01007.pdf

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