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AR# 43400

13.1 PlanAhead - The default Vccaux for Spartan-6 devices is set to 3.3V

Description

In PlanAhead 13.1 software the default value of Vccaux is set at 3.3V. Is this correct?

Solution

No, the Spartan-6 FPGA Vccaux default value should be 2.5V.

In PlanAhead 13.2 software the default value has been changed to 2.5V from 3.3V.

For pins where a user has specifically set a Vccaux value, there should be no change. However, if a user was depending on the default values, this change may affect their design.

The changed values will be recognized in DRCs, tie hi/low, IBIS, and the SSN analysis.
AR# 43400
Date Created 07/29/2011
Last Updated 07/29/2011
Status Active
Type General Article
Devices
  • Spartan-6 LX
  • Spartan-6 LXT
  • Spartan-6Q
Tools
  • PlanAhead - 13.1
  • PlanAhead - 13.2