How can I change the default transceiver VCCH and VCCA_L/R voltage settings for Stratix IV GX and Arria II GX devices?

Description

You can change the default transceiver VCCH_GXB_L/R and VCCA_L/R voltage settings for Stratix® IV GX and Arria® II GX devices in Quartus® II in the following settings location.

Assignments > Settings > Operating Settings and Conditions > Voltage.