Error connecting to the target: (Error -1155 @ 0x0) Device may be operating in low-power mode. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TC

Error connecting to the target: (Error -1155 @ 0x0) Device may be operating in low-power mode. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 5.1.450.0) 

板子的供电正常,5V出来得到3.29V和1.89V,电压稳定,测量JTAG口的 EMU0和EMU1得到电压是3.29V,接的上拉电阻是4.7K,请问是什么原因导致的连接失败?请大神指导,谢谢!

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