This is a known issue with the 7 Series GT Wizard in VIVADO 2014.4 (or) earlier.
To fix this issue, install the patch attached at the end of this answer record and regenerate the core.
This will ensure that the CTLE tuning is done sequentially.
Installation instructions are available in the readme file that is attached.
CTLE tuning is done sequentially with the GTZ transceiver wizard release with VIVADO 2015.1.
Staggering of resets to individual transceivers will be done in VIVADO 2015.2.
To stagger resets in a design generated from 2015.1 (or) with the patch from this AR, please follow the instructions below.
Example: A design has 8-lanes (GTZ) and lane0 is sourcing RXUSRCLKs.
The first initialization of all lanes will always be sequential.
If any lane other than lane0 needs to be re-initialized independently, the lane_select_in port can be used to do the re-initialization.
If lane0 is re-initialized, all of the other lanes needs to be re-initialized again.
2/23/2015 - Initial Release.
5/5/2015 - Updated with more specific details regarding reset and CTLE tuning
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