本文根據SPI 同步串行接口的通信協議，介紹了在CPLD 中利用VHDL 語言實現PC/104
總線擴展SPI 接口的設計原理和編程思想。通過該方法的介紹，使得那些沒有SPI
接口功能的處理器和控制器能夠擴展SPI 接口，以便同外部設備進行數據交換。并
給出了VHDL 語言的源代碼程序。
關鍵詞：SPI 接口；CPLD；PC/104 總線；接口設計；VHDL
Design 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