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C6416连不上仿真器请教!



     这几天在调C6416的板子:经测试电源、RST信号都正常,外部配置引脚也都检查过,不过总是连不上仿真器,报错如下:
 
Error connecting to the target:
Error 0x80001240/-1145
Fatal Error during: Initialization, OCS, Target, 
Unrecoverable emulation error
Sequence ID: 0
Error Code: -1145
Error Class: 0x80001240
I/O Port = 240
Board Name: C64xx SEEDXDS510PLUS Emulator_1
Cpu Name: TMS320C6400_0
Abort: Close Code Composer Studio.
Retry: Try to connect to the target again.
Cancel: Remain disconnected from the target
Diagnostic: Run diagnostic utility.
 
     另外测试了JTG各信号:在接上XDS510但不connect的时候各个信号均正常(clk&clk_ret均有时钟,约为10M多);在connect时TDI有信号给DSP,但是TDO始终为高电平(开发板在connect时TDO有信号)。所以想请教下哪位知道TDO在什么条件下会返回信号(或者说:TDO无返回信号可以推断出有哪些故障可能)?
     请知道原因的高手帮忙解答下!十分感谢!