提出一种IO复用方法,将设计的IO复用电路应用到拥有多个功能模块的芯片中,使多个模块共享同一组IO,通过减少芯片中IO的数量来节省芯片面积。仿真结果表明,静态输入IO复用电路和动态输出IO复用电路均具有较好的性能,其工作频率分别达到2.5GHz和1GHz。将这两种IO复用电路应用于含有4个功能模块的芯片中,芯片的IO数量减少76个,节约版图面积2.54mm2,IO版图优化率高达72.95%。最后,推导出拥有2~8个功能模块的芯片的IO版图优化率在50%~87.5%的范围内。 An IO multiplexing method is proposed. The designed IO multiplexing circuit is applied to a chip with multiple functional modules, so that multiple modules share the same IO group, and the chip area is saved by reducing the number of IOs in the chip. The simulation results show that the static input IO multiplexing circuit and the dynamic output IO multiplexing circuit have good performance, operating frequency of 2.5GHz and 1GHz respectively. Applying these two IO multiplexing circuits to a chip with four functional modules, the number of IO chips is reduced by 76, saving 2.54mm2 of layout area and 72.95% of IO layout optimization rate. Finally, it is deduced that the IO layout optimization rate of chips with 2 ~ 8 functional modules is in the range of 50% ~ 87.5%.