Protocol conversion is disclosed. A first transaction of a first protocol and a second transaction of a second protocol are accessed. From the accessed transactions, a plurality of protocol conversions are computed. Additional transactions of the first protocol and additional transactions of the second protocol can be accessed, and further protocol conversions applicable between the additional first and the second transactions can be computed. Based on at least some of the applicable protocol conversions, a combined controller that is able to convert between the transactions of the first and second protocols is generated. Instructions that are operable to describe the combined controller are stored in a computer readable medium.