Gigabit Ethernet Interface (via Marvell 88E1111) with Cyclone IVE FPGA

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Let me clarify little more:

At first, I want to interface Ethernet MAC with Cyclone IVE by means of Marvell PHY (MII/RGMII Interface) . The data stream is still not fixed but it will be close to Gigabit.

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This interface "requirement" is still too vague - "close to Gigabit" is not a definitive statement.

If your protocol is uncertain, then you should really consider interfacing to the Gbps data stream *directly*. The Cyclone IV GX devices are inexpensive, and you will not have to deal with Marvell and its annoying NDAs.

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Is it worthy to proceed in this way or should I use some other alternative if any?

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Create a simulation of the data stream and capture it using a Cyclone IV GX transceiver channel.

If the Gbps data stream is ~1Gbps, then you can also consider using LVDS on a Stratix series device.

Cheers,

Dave