USB 2.0 protocol analyzer based on an FPGA and an analysis method

Abstract

The invention provides a USB 2.0 protocol analyzer based on an FPGA and an analysis method. A differential signal sampling input module is used for collecting data transmitted on a USB 2.0 differential bus under the normal working condition of tested equipment; And the logic control device is used for realizing enumeration of the USB2.0 protocol analyzer, reading a sampling result from the sampling front end, buffering data to the data memory, and uploading the sampling data to the monitoring host through the host interface by taking a USB data packet with a preset size as a unit. Low-voltagedifferential signals of differential data buses of high-speed and full-speed USB equipment can be sampled and analyzed in real time; By using the concurrent processing characteristic of hardware, theproblem of sampling dead zone is solved, the problems of data accumulation and packet loss caused by transmission phase difference of different USB interfaces are solved, the requirement on the performance of a main processor is reduced, the design cost is reduced, and an effective support is provided for development and testing of a USB system.

Description

technical field [0001] The invention relates to the field of computer hardware, and more specifically relates to an FPGA-based USB2.0 protocol analyzer and analysis method. Background technique [0002] Universal Serial Bus USB (Universal Serial Bus) has become a data transmission interface commonly used by computer peripherals due to its versatility, high-speed and plug-and-play characteristics. However, because the USB bus uses NRZI encoding format and no clock synchronization Differential data transmission mode, its bus activity content is highly transparent to users, and the complexity of the USB protocol itself makes it very difficult to develop USB host controllers, USB devices, USB firmware programs, and USB drivers, and the development cycle is generally longer. On the other hand, as the USB bus becomes the mainstream data transmission interface, the testing and maintenance problems of USB devices are becoming more and more prominent, and the logic analyzers or proto...

AI Technical Summary

Problems solved by technology

[0002] Universal Serial Bus USB (Universal Serial Bus) has become a data transmission interface commonly used by computer peripherals because of its versatility, high-speed and plug-and-play characteristics. However, because the USB bus uses NRZI encoding format and no clock synchronization Differential data transmission mode, its bus activity content is highly transparent to users, and the complexity of the USB protocol itself makes it very difficult to develop USB host controllers, USB devices, USB firmware programs, and USB drivers, and the development cycle is generally longer. On the other hand, as the USB bus becomes the mainstream data transmission interface, the testing and maintenance problems of USB devices are also becoming more and more prominent. At present, the logic analyzer or protocol analyzer used for USB device testing is generally expensive, and some The instrument has a serious sampling dead zone, which is difficult to meet the application needs of developers

Images