GMII to RGMII converter

Hi,

Are there any reference designs available to convert GMII interface to RGMII interface?

The main intent on posting this question is that I have a system with an EMAC IP (Third party-Flexibilis) which is configured to GMII interface. Now, that due to obselesence, PHY IC needs to be changed which is compliant with RGMII interface. Hence I need a converter to convert GMII to RGMII interface.