When the Power Analyzer is executed in the Quartus® II software for transceiver-based designs targeting Arria® V, Cyclone® V, or Stratix® V devices, the power supply voltages of the transceivers may be automatically determined by the transceiver usage (like data rate setting). Although the Quartus II software has options for transceiver power supply voltages in the Voltage setting of Operating Settings and Conditions category under Settings, they are ignored by the PPPA.
For example, in Cyclone V devices, the PPPA automatically sets VCCE_GXB and VCCL_GXB to 1.1V when using PCIe 1.0 whose data rate is 2.5 Gbps, whilst it automatically sets them to 1.2 V when PCIe 2.0 is used, whose data rate is 5.0 Gbps. But you can supply 1.2 V to VCCE_GXB and VCCL_GXB in your design with PCIe 1.0 too.
To set the power supply voltages of the transceivers based on your design usage, you can use the following assignment using the Assignment Editor:
- Choose VCCA_GXB Voltage in the Assignment Name column.
- Choose voltage in the Value column.
VCCR_GXB / VCCT_GXB / VCCE_GXB
- Choose VCCR_GXB/VCCT_GXB Voltage in Assignment Name column
- Choose voltage in the Value column
For details about these assignments, refer to the Transceiver PHY IP Core User Guide.
Also, refer to the respective device handbook, datasheet, or Pin Connection Guidelines for more details on transceiver power supply voltage settings.