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两片STM320C6678 ,jtag口 采用菊花链方式连接,其中第二片dsp 显示device is held in reset

两片STM320C6678 ,jtag口 采用菊花链方式连接,其中第二片dsp  显示device is held in reset,但是有时候能挂载,但过一会就显示 in reset。第一片一直可以挂载。JTAG 菊花连接方式参考SPRU641 P13. 添加了gel 文件。哪位大神指点一下?难道是jtag没有加驱动器,直接用电压转换芯片txs,将信号转为3.3v 后接jtag?  仿真器用的xds100 v3