When using the Serial Rapid IO Megacore® function with Quartus® II 8.0, setting the "Transmitter Buffer Power (VCCH)" to 1.2V does not get transferred to the ALT2GXB® transceiver instance.
To correctly set the Transmitter VCCH to 1.2V, you must open the ALT2GXB Megacore function which is instantiated within the Serial RapidIO Megacore and set the VCCH option to 1.2V in the Tx Analog tab. You must then regenerate the transceiver files by clicking "Finish". You must also ensure that you set the transceiver IO standard to 1.2V PCML in the Assignments Editor.
If you need to regenerate the Serial RapidIO Megacore for any reason, you will need to repeat this step for the ALT2GXB Megacore.