Simulate connected transceiver devices

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I am working on designing a custom transceiver protocol and would like to simulate two connected Cyclone IV devices to work on developing the state machines. Is there a way to do this in Quartus II or other simulation package? Any suggestions would be greatly appreciated.

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rx <= tx;

Seriously, its that simple :)

Create your two separate designs for the two Cyclone IV GX devices. Create a testbench that contains both device top-level designs, and connect their reference clocks to appropriate sources, eg., a common clock, and connect the transmitter from one device to the receiver on the other, and vice versa.

Cheers,

Dave