摘要： 针对通用JTAG端口不能在远距离对高速处理器进行仿真的问题，提出增强型JTAG接口方案。通过讨论高速处理器的JTAG端口信号的特征和时序，定性分析JTAG接口不能用于远距离仿真的原因。对通用JTAG接口进行信号驱动以及信号完整性补偿，给出接口的电路图和测试结果。实验结果表明，增强型JTAG接口可在120 cm外对高速处理器进行仿真。

关键词: 数字信号处理器, 高速处理器, 仿真, JTAG接口

Abstract: According to the problem that high-speed processors can not be emulated through common JTAG-interface in a long distance, enhanced JTAG interface is proposed. Several factors are analyzed quantitatively that relate to the failure of emulating the high-speed processors in a long distance, through the discussion of character and timing of JTAG-interface-signals. According to the conclusion, drivers and compensation of signal integrity are given to the signals of common JTAG interface. The circuit and test result of the design is also discussed. The results show high-speed processors can be emulated through enhanced JTAG-interface over 120 cm.

Key words: Digital Signal Processor(DSP), high-speed processor, emulation, JTAG interface

中图分类号: 

• TN911.72