I am using the LogiCORE Ten Gigabit Ethernet PCS/PMA (10GBASE-R/10GBASE-KR) v2.3 example design .ucf file for 7 series.
Some of the constraints are not passed through the MMCM and this results in unconstrained paths.
This does not apply if using the constraints in Vivado Design Suite.
Attached below is an updated .ucf constraint file to resolve the issue.
Constraints with #New above them are new constraints and Constraints with #Updated have been updated.
This issue is resolved in the next release of the core: v2.4 in the ISE 14.2/2012.2 release.
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