JTAG协议规范1149.1和1149.7，cjtag，可参考内容。 IEEE 1149.7 is a standard for a test access port and associated architecture that offers reduced pins and enhanced functionality

JTAG设计规范,对于设计JTAG接口有很大的帮助

IEEE Standard Test Access Port and Boundary-Scan Architecture

从各方面描述了3种配置FPGA的方式：1.FPGA主动串行(AS)方式 2. JTAG方式 3. FPGA被动(Passive)方式。 很有用，看完以后豁然开朗 因为我也想下一些东西，所以要了2分，见谅！

USB转JTAG的原理图，非常详细，对于自制USB转JTAG很有用！！

JTAG IP CORE,很详细的程序代码

J-Link Software and Documentation pack for Windows Installing the software will automatically install the J-Link USB drivers and offers to update applications which use the J-Link DLL. Multiple versions of the J-Link software can be installed on the same PC without problems; they will co-exist in different directories.

这个文件用Verilog语言描述了jtag的功能

JTAG原理图+固件 用于自制JTAG的仿真器资料！

20脚JTAG封装，用AD画的，AD都可以打开