C2000使用TI的开发套件仿真，连接时出现如下错误提示，测量芯片JTAG等引脚连接正常，请问可能是什么原因造成的？

C28xx: Failed CPU Reset: (Error -1137 @ 0x0) Device is held in reset. Take the device out of reset, and retry the operation. (Emulation package 5.1.450.0)
C28xx: Trouble Reading Register PC: (Error -1137 @ 0x0) Device is held in reset. Take the device out of reset, and retry the operation. (Emulation package 5.1.450.0)
C28xx: Trouble Reading Register ST1: (Error -1137 @ 0x6) Device is held in reset. Take the device out of reset, and retry the operation. (Emulation package 5.1.450.0)
C28xx: GEL: Error while executing OnReset(1): Target failed to read register ST1    at (ST1&~(0x0100)) [f28069.gel:301]    at C28x_Mode() [f28069.gel:32] at OnReset(1) .