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AR# 63017

Vivado Power Analysis - How do I set power supply voltages (worse-case or upper power supply voltage per rail)?


How do I set power supply voltages (worse-case or upper power supply voltage per rail)?


Voltage scaling is one of the prominent power saving approach in FPGAs.

There are different voltage rails to supply specific logic in the device.

Each Device Datasheet lists the recommended operating conditions of these rails.

For example, Kintex-7 devices can operate with a VCCINT rail between 0.97V and 1.03V.

You can make use of voltage scaling to meet your power budget.

In the Hardware setup, these rails are supplied by external Power Regulators with fine grain controls.

Power is monotonic to Supply Voltage.

It is vital to provide the exact or worse-case supply voltage to estimate accurate power.

***RECOMMENDATION*** Specify accurate Power Supply values in the Power Supply Tab of Report Power Dialog Box!

This can be done In the GUI, in the Report Power Settings window or through the following Tcl Command:

set_operating_conditions -voltage {vccint 0.98 vccaux 1.8}

Note: Refer to (UG907) Power Analysis & Optimization for more information about Tcl command usage and signal rate or toggle rate usage.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
63015 Vivado Power Analysis - How do I get the most accurate results from report_power? N/A N/A
AR# 63017
Date 12/04/2014
Status Active
Type General Article
  • Vivado Design Suite - 2014.4
  • Vivado Design Suite - 2014.3
  • Vivado Design Suite - 2014.2
  • Vivado Design Suite - 2014.1
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