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求助 dsp28016 ccs与目标板连接不上



 网友dulala 在21ic TI DSP技术论坛问以下问题未能解决: 

我自己做了一块dsp28016的最小系统,测得电压、时钟信号都是正常的,用的仿真器是spectrum digital XDS510LC usb

每次连接报错是:
Error connecting to the target:
Error 0x80000200/-1135
Fatal Error during: OCS,
Unrecoverable emulation error

I/O Port = 510

Board Name: F2808 XDS510USB Emulator
Cpu Name: cpu_0

Abort:  Close Code Composer Studio.
Retry:  Try to connect to the target again.
Cancel:  Remain disconnected from the target
Diagnostic: Run diagnostic utility.

接上仿真器后,测JTAG的TRST一直为低,TCK没有脉,TMS为3.28V。
我查了硬件没发现什么问题
请高手们指点是什么原因?