This paper describes the features and design methodology of MIDA, a MPEG1 integrated audio decoder. MIDA has been almost completely designed using automatic synthesis of VHDL descriptions, and has been implemented using a cell based approach and a 0.7 µm, 2 metal layers CMOS technology. The die area is 95 mm2. Synthesis tools have also been used for automatic insertion of test structures and automatic test pattern generation.