This paper describes and demonstrates a toolchain which enables HW-SW co-synthesis from a single high-level dataflow program. This toolchain does not only enable rapid-prototyping of complex designs, but also provides a complete system integration framework including synthesis of SW-HW interconnect. This framework minimizes the designer efforts for a low level implementation. A co-design example of a JPEG codec is demonstrated using a high-level dataflow language, named CAL.