基于FPGA的数字示波器串行总线SPI触发设计

基于FPGA的数字示波器串行总线SPI触发设计

内容简介：数字示波器的触发系统主要包括触发同步比较器、触发源选择、异步触发、触发释抑、同步触发、双斜坡扩展、内插计数等，常用的触发类型有边沿、脉宽、TV和电源触发等，这几种触发类型可以满足大部分应用场合的要求，但是针对串行总线领域，已经不能满足要求。SPI是一种高速的、全双工、同步的串行通信总线，应用十分广泛。本文介绍了一种数字示波器串行总线SPI触发的设计方法，采用FPGA来实现，资金投入低，开发周期短，且具有极高的触发精度和准确度，并使用软件Modelsim6.5进行设计仿真。

Abstract：The trigger system of digital oscilloscope consists of trigger synchronous comparator, trigger source choice, asynchronous trigger, trigger holdoff, double slope expansion, interpolation count, etc. The main trigger types have edge, pulse width, TV, power trigger, etc. These trigger types are satisfy the requirement of the most application situations, but for the area of serial bus, the requirement is not satisfied. SPI is a high-speed, full-duplex, synchronous serial communication bus, it is widely used. This article introduce a design method of digital oscilloscope SPI serial bus trigger, using FPGA to implement it, low capital investment, short development cycle, super high trigger precision and accuracy, and the simulation has been carried out with Modelsim6.5 software.

作者：彭海军,

关键词：数字示波器, 触发, 串行总线, SPI