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TMS570LC4357: MII and RMII design with LWIP

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN


I've developed an application that receives the data over Ethernet and transmits the received data over Ethernet. The base application for my this development is LWIP and the code works fine. Upon checking the HALCoGen Project for this, I could find that the Ethernet interface is MII. 

The query is, while I tried changing the interface from MII to RMII, the same code did not work! How do I get RMII working? Do I need to make and Hardware and / or software changes for this?