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AR# 42765

Kintex-7 - Is it possible to set the VCCAUX_IO to 2V but run the I/O at a data rate less than the maximum?


In the Kintex-7 data sheet the maximum data rate is given based on the VCCAUX_IO settings. What are the implications if you power the VCCAUX_IO at 2V but then use a data rate that can be achieved with a VCCAUX_IO of 1.8V?


There will be no issue running the I/O powered with VCCAUX_IO = 2V at data rates that are supported by the VCCAUX_IO 1.8V.

Increasing the VCCAUX_IO to 2V will increase power consumption (use XPE or Xpower for numbers). Also 1.8V is a more common power rail and would allow for the sharing of supplies, using 2V requires a dedicated regulator for this. If you are using LVDS VCCAUX_IO, it can be set at 1.8 or 2.0V and meet the 1.25 Gb/s.

Running at 2.0V will be better for performance, but burns more power; therefore, use VCCAUX_IO = 1.8V, if possible.

AR# 42765
Date Created 11/30/2012
Last Updated 11/30/2012
Status Active
Type General Article
  • Kintex-7