bypass板载XDS110,通过外部的XDS110仿真器连接AWR1642BOOST时出错的问题

Other Parts Discussed in Thread: AWR1642, AWR1642BOOST

你好,我在用AWR1642BOOST进行开发,想尝试bypass板载XDS110,通过外部的XDS110仿真器进行在线调试,

具体操作如下:

去掉了电阻R176,以断开板载XDS110的供电,从60pin HD connector 附近飞了5根线(TDI、TDO、TCK、TMS、GND),连到XDS110的CTI-20的对应引脚上,

并将SOP[2:0]设置为001。

然后,在CCS端,进行Target Configurations,选择“Texas Instruments XDS110 USB Debug Probe”,以及“AWR1642”。

生成ccxml文件,进行Test connection,出现如下错误:

An error occurred while hard opening the controller.

-----[An error has occurred and this utility has aborted]--------------------

This error is generated by TI's USCIF driver or utilities.

The value is '-267' (0xfffffef5).
The title is 'SC_ERR_XDS110_TARGET_SUPPLY'.

The explanation is:
The controller could not detect valid target supply. Check target
JTAG connection and/or connection setting specifying voltage level.

[End: Texas Instruments XDS110 USB Debug Probe_0]


请问:
(1)上述情况是怎么回事?我哪里设置的不对吗?
(2)JTAG相关的5根线长度有限制吗,是否不能太长?
(3)JTAG相关的飞线是这5根吗?还需要电源?TRST吗?