加10K下拉电阻，数据手册上第48页TRST管脚备注中有说明。
To ensure a proper logic level during reset when these pins are both routed out and 3−stated or not driven, it is recommended to include an
external 10 kΩ pullup/pulldown resistor to sustain the IPU/IPD, respectively.
http://www.ti.com.cn/cn/lit/ds/symlink/tms320c6713b.pdf