altera Startix GX 530

Are you hoping to implement the HDMI physical layer directly from a Stratix GX part?

Altera's own development boards that support HDMI all use external phy's, generally from Analogue Devices. Parts such as AD's ADV7513.

If that's how Altera choose to implement HDMI, I'd suggest that should tell you something about how you might choose to implement it. Choosing an appropriate phy will allow you to host HDMI 1.3 or 1.4 from an FPGA