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XDS560 Emulator cannot connect the DM8168 target

Hi,all:

        I designed a new DM8168 board, when I gotten an emulator to connect the DM8168 target, I can see the Cortex-A8 core has been connected, but after 2 or 3s, the

CCS4 show a dialog that tell something wrong happened, and "Failed" to connect the target. I had checked the PCB for many times, including Power and power seqence,

POR pin pulled up through 1k ohm and bypassed with  2.2uF, connection of RESETN pin if show in the picture, can anyone tell me what should I do at this time.