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KEIL CAN'T FIND MY M3!!

I design and make a board using CM3.But when I power the board first time, I can't download the code to the MCU.

The IDE is Keil uVision4,and it says ,"could not initialize the target device. please power cycle the board and try again" and "flash download failed target DLL cancelled".

I test the vcc, it is 3.3v right. What's the problem? Is it wrong with the Crystal , the MCU , the configuration of the keil, or others?

PS:  I USE LM3S6950 in the design, and the circuit refer to the TI evaluate kit board.

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