- Functional verification of the new generation microprocessor developed by SGS-THOMSON Microelectronics makes extensive use of advanced technologies. This paper presents a global overview of the methodology and focuses on three main aspects : - Use of acceleration and emulation technologies for the verification of the VHDL specification in the early stages of the design. - Development and use of sequential verification methods built upon a commercially available formal proof tool. - Extensive use of combinational proof for circuit-level tion, in conjunction with transistor abstraction.