TI官方的EVM6657LS评估板，按照给的资料安装了CCS5.2.1, Emulation package, BIOS MCSDK, 连接板子，BOOT mode选的NO boot，创建TCF文件，选择TMS320C6657，emulation选的XDS2xx USB onborad Emulator 然后启动ccxml文件，然后右键点core0，点connect target后显示连不上，错误信息为
Error connecting to the target:
(Error -2131 @ 0x0)
Unable to access device register. 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 5.0.838.0)
请问这有可能是什么原因导致的？怎么解决呢？
