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6678dsp can not connect to PC

Other Parts Discussed in Thread: TMS320C6678

My  ccs  version  is 5.3 .  DSP  is TMS320C6678.

After i plug the usb cable  between  JTAG port  and  PC  usb port.

i also installed the driver program . In my PC's device manager i can see there is a device , it means my driver is correct .

however ,  the DSP still can not connect to PC .If DSP wants to work , does it need some requisites?

i know the DSP also connects to a FPGA  chip. does FPGA chip should give DSP some indispensable signal ?

thank you .