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The lvds inputs can easily swictch at 1 GHz .. so arria ii gx can be used to communicate with 1G device ..
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1 GBPS LVDS is possible in DPA mode (because the DPA circuit is using it's own clock network), 945 GBPS in non-DPA mode, with fastest speed grade respectively So if you utilize DPA for your design, you can operate a SERDES at 1 GBPS, otherwise you can't (at least not by guaranteed specification). As said, DPA basically involves an automatic adjustment of receiver phase to the incoming data edges, but not setting a particular receiver phase manually.
In my opinion, several promising suggestions have been made. You should start trying the different options.
Regarding VCO lock range, I verified, that the about 1:2 range can be actually utilized with Cylone devices, it should also work with Arria II, that has a similar PLL specification. For a larger frequency range, dynamic reconfiguration would be necessary.
P.S.: Can you tell which XILINX devices have a runtime programmable IOBDELAY?
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