摘要： 给出联合测试行为组织(JTAG)边界扫描技术的概念，说明JTAG关键组件及相关的指令，介绍实际开发的通用JTAG在线仿真器。该仿真器在基于计算机并口的JTAG在线仿真器基础上进行改进，加入现场可编程门阵列，利用并口并行传输的优势，克服传统JTAG在线仿真器的速度局限性。通过自定义的通信协议，提高通信的可靠性和安全性，同时达到比传统JTAG在线仿真器更优的性能。

关键词: 联合测试行为组织, 边界扫描单元, 现场可编程门阵列, 并口, 仿真器

Abstract: A concept of Joint Test Action Group(JTAG) boundary scan technology is proposed. The key components and related commands are introduced. A universal Flash simulator focusing on the engineering application is introduced. Based on the traditional JTAG on-line simulator, it adds the use of FPGA. It makes full use of the advantage of parallel transmission of parallel port and break through the speed bottleneck of the traditional JTAG on-line simulator. With self-identified communication protocol, it not only improves the reliability and security of the communication, but also realizes a higher performance than the traditional JTAG on-line simulator.

Key words: Joint Test Action Group(JTAG), boundary scan cell, Field Programmable Gate Array(FPGA), parallel port, simulator

中图分类号: 

• TP337