Can an RGMII interface be used with the hard_temac v3_00_a and v3_00_b? The data sheet only indicates support for MII, GMII, and SGMII.
When the data sheet was written for version v3.00.a/v3.00.b of the hard_temac, support for RGMII was not included in the data sheet because it had not been tested in hardware; however, all of the files are there for RGMII v1.3. Subsequently, Xilinx has been successful using RGMII v1.3 in hardware with the core. To use RGMII, follow these steps:
1. Set C_PHY_TYPE = 2 for RGMII.
2. Calculate the correct IDELAY to use.
3. Lock down the IDELAY and IDELAY Controller in the UCF.
For an example of using RGMII with the ML410, see: