【应用手册】SMBus for GPIO Pin Expansion in MAX II CPLDs This application note illustrates the capability of Altera® MAX® II CPLDs to provide general purpose I/O pin expansion via an industry standard System Management Bus (SMBus). SMBus for GPIO Pin Expansion in MAX II CPLDs December 2007, version 1.0 Application Note 484 Introduction This application note illustrates the capability of Altera MAX II CPLDs to provide general purpose I/O pin expansion via an industry standard System Management Bus (SMBus). SMBus for GPIO To reduce package size and pin count, the number of General Purpose I/O (GPIO) pins in a microprocessor-based system are limited, but if the Pin Expansion system has an SMBus interface, this design can……