Timing constraint for 1000Mbps Small Mac in Quartus 14.0

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Yes that much I understand and the interface I'm using for my external Ethernet is rgmii.

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You might have a look at this example from Altera.

http://www.altera.com/support/examples/interfaces-peripherals/exm-tse-rgmii-phy.html

However, as I recall the Ethernet independent examples in Time Quest User's Guide follow on for source synchronous timing are a good place to start.

http://www.alterawiki.com/wiki/source_synchronous_analysis_with_timequest