Device Family: Arria 10 GT, Arria 10 GX, Arria 10 SX, Arria II GX, Arria II GZ, Arria V GT, Arria V GX, Arria V GZ, Arria V ST, Arria V SX, Arria GX, Cyclone IV, Cyclone IV GX, Cyclone V, Cyclone V GT, Cyclone V GX, Cyclone V ST, Cyclone V SX, Stratix, Stratix II, Stratix II GX, Stratix IV, Stratix IV GT, Stratix IV GX, Stratix V, Stratix V GS, Stratix V GT, Stratix V GX
Type: Answers
Area: Component

Last Modified: August 22, 2016

Why do I not see any differences in the transceiver Quartus II Power Play Power Analyzer results when I change operating voltage settings?


You can set transceiver operating power supply voltages in the Operating Settings and Condition on  Assignments/Settings.  The Quartus® II software overrides your voltage settings based on transceiver data rate and PowerPlay Power Analyzer (PPPA) estimates transceiver power using overrode voltage settings.

Therefore, PPPA shows the same transceiver power estimation regardless of user voltage settings in some cases.

For example, in a Stratix® V GX device, you can choose VCCR/VCCT from among 0.85V, 0.9V and 1.0V, and VCCA from among 2.5V and 3.0V based on your target device. When the transceiver is configured at a base data rate > 6.5 Gbps, the Quartus II  software uses 1.0V for VCCR/VCCT and 3.0V for VCCA regardless of your settings.

Refer to the respective device handbook, datasheet or Pin Connection Guidelines for more details of transceiver power supply voltage settings.