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unable to connect eZdspTMS320F2808usb develep board using SDFlash

Hallo

i am going to use SDFlash to program eZdspTMS320F2808.  When i try to reset the board, i get the error:

ERR: Failed emulation connection to the target
ERR: DSP reset failed

I use XDS510USB Jtag emulator and it is checked by SDconfig. 

SDFlash is latest version. drives and ports seems good.

The board can be programmed using CCS 3.3.

What wrong?

Can someone help me. Thanks a lot!


Wei