本文根据SPI 同步串行接口的通信协议，介绍了在CPLD 中利用VHDL 语言实现PC/104总线扩展SPI 接口的设计原理和编程思想。通过该方法的介绍，使得那些没有SPI接口功能的处理器和控制器能够扩展SPI 接口，以便同外部设备进行数据交换。并给出了VHDL 语言的源代码程序。关键词：SPI 接口；CPLD；PC/104 总线；接口设计；VHDLDesign of SPI Interface Based on PC/104 Bus and CPLD Liang Xiang1 , Feng Jiping1，An Xuejun2 (Department of Optical & Electrical Engineering, Ordnance Engineering College ,050003 Scientific Research Center , 93469 Troop,050071) Abstract: This paper based on communication protocol of SPI synchronous serial interface, presents the design theory and programming idea of implementing PC/104 bus expand SPI interface with VHDL language in CPLD device. This interface can be used to data exchange with peripheral apparatus for processor and controller which have not SPI interface function. Moreover presents VHDL source codes .Key words: SPI Interface；CPLD；PC/104 Bus；Interface designs；VHDL
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