Yes. Currently we have the LatticeECP3 CPRI IP demo reference design (version2.0) that is available for download on our website:
http://www.latticesemi.com/FileExplorer.aspx?media={A3EB1AA0-3EA0-40D2-8860-ABB289B9E731}&document_id=35086
Note: This demo(version 2.0) default setting is LatticeECP3-95 1152 pin package. It can also be modified to support any other LatticeECP3 devices.
The demo reference design source code is open sourced and it was created in ispLEVER. But the reference design project can be imported to Lattice Diamond version and a new bitstream can be regenerated in Lattice Diamond.