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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

leping yao
Prodigy 210 points

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！