基于FPGA与PC/104总线的SPI接口设计

Design of SPI Interface Based on FPGA and PC/104 Bus

为满足嵌入式工业控制计算机通过PC/104总线实现对具有SPI接口的程控放大器控制的需要,在研究了PC/104总线和SPI总线通信协议的基础上,首先介绍了SPI总线和PC/104总线的结构和工作时序;提出基于FLASH架构FPGA芯片的PC/104总线转SPI总线接口设计方案,给出了SPI控制状态机的设计思路,并用ModelSim仿真软件进行了仿真验证,最后通过仿真和实验验证了设计方案的正确性和可行性。

In order to meet the demand of realizing the control of programmed amplifiers with SPI interface by imbedded industrial-controlled computers through PC/104 bus, based on the research on communication protocol of PC/104 bus and SPI bus, this paper firstly introduces the structure and working time sequence of SPI bus and PC/ 104 bus, then proposes the interface design scheme for PC/104 bus converting to SPI bus based on FLASH framework of FPGA chip, provides the design idea for SPI-controlled state machine, makes simulation test by using ModelSim simulation software and finally verifies the validity and feasibility of this design scheme by simulation and experiment.