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外置XDS100V2仿真器如何连接TMS570LS3137-SDK开发板

       手上有一块TMS570LS31x_HDK开发板,TI官方买的,可以使用板子上自带的XDS100V2 USB接口直接调试,我看到板子上还有一个20Pin的JTAG直针接口,参考原理图上是连接到了570上的,同时我手中还有一个网上买的XDS100V2仿真器,14pin接口和20pin接口,定义如下;

官方开发板给出的原理图中jtag定义如下:

测试时,硬件连接是:TMS,TDI,TDO,TCK,RTCK,nTRST,GND一一对应连接,win7旗舰64操作系统,CCS5.2,错误提示是180.提示是目标未上电;请问是什么问题呢?