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What could you have done to 'fry' the codec chip?
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I suspect the chip was fried from factory, or maybe poorly soldered to the board. I've done some verilog code to communicate with the chip and tried it but even assuming I made a mistake in the pin assignments for the FPGA I don't think that could destroy the chip.
Do you think an error on the pin assignments could damage the chip?
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Try using a scope to access what signals you can. Are the digital signals present on the chip? Is there analog audio coming out?
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None of the signals are available. Both the FPGA and Codec are BGA packages and none of the wires can be probed.
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