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Connect to PRSC faile问题

我的芯片型号为TMS320C6748BZWT, ,这个应该是不带E版本吧,在进入debug的时候出现“Error connecting to the target: Connect to PRSC failed” 

开发板连接正常,可自己的板子就是有这样问题,电源时序测量1.2V/1.3V/1.8V/3.3V,应该没有问题,时钟为24M,峰峰幅值偏小,才900mV,而不是1.2V,感觉这也不是关键,JTAG,复位上下拉电阻也有,但就是有这样的问题,帮帮忙,谢谢!.

另外测试JTAG各引脚电平及波形,时钟、TMS、TDI/O这些信号都是有的,自己的板子和开发板一模一样,