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TMS320F280049C: 器件无法连接 Error connecting to the target: (Error -2131 @ 0x0)

Part Number: TMS320F280049C

CCS 版本是 v7.4.0,compiler 版本是TI 18.12.1.LTS。在连接器件,debug时出现这个问题:

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 7.0.100.0)

请问应该怎么解决呢?谢谢