This paper presents the main project we use as guiding line when teaching reconfigurable computing to master students. This project addresses building up a simple RISC processor, that supports an ex- tensible instructions set thanks to its reconfigurable functional unit. The originality comes from that the students make use of the Biniou framework, that has been developed in the Lab-STICC. The Biniou ap- proach covers tasks ranging from describing the RFU, synthesizing it as VHDL code, and implementing applications over it.