最近在使用CCS6.1做AM437x板卡的开发工作，板子是基于AM437x系列的芯片，但在没想到第一步硬件连接的时候就遇到了问题。在板子和emulator之间使用了两个转接头来匹配连接，在使用BlackHawk的USB200 emulator连接板子时，Target Connection部分出现了以下错误：
[Start: Texas Instruments XDS2xx USB Debug Probe_0]
Execute the command:
%ccs_base%/common/uscif/dbgjtag -f %boarddatafile% -rv -o -S integrity
[Result]
-----[Print the board config pathname(s)]------------------------------------
C:\Users\JTAG\AppData\Local\TEXASI~1\CCS\
ti\1\0\BrdDat\testBoard.dat
-----[Print the reset-command software log-file]-----------------------------
This utility has selected a 560/2xx-class product.
This utility will load the program 'xds2xxu.out'.
The library build date was 'Sep 5 2015'.
The library build time was '01:01:44'.
The library package version is '6.0.14.5'.
The library component version is '35.35.0.0'.
The controller does not use a programmable FPGA.
The controller has a version number of '13' (0x0000000d).
The controller has an insertion length of '0' (0x00000000).
This utility will attempt to reset the controller.
This utility has successfully reset the controller.
-----[Print the reset-command hardware log-file]-----------------------------
This emulator does not create a reset log-file.
-----[An error has occurred and this utility has aborted]--------------------
This error is generated by TI's USCIF driver or utilities.
The value is '-233' (0xffffff17).
The title is 'SC_ERR_PATH_BROKEN'.
The explanation is:
The JTAG IR and DR scan-paths cannot circulate bits, they may be broken.
An attempt to scan the JTAG scan-path has failed.
The target's JTAG scan-path appears to be broken
with a stuck-at-ones or stuck-at-zero fault.
[End: Texas Instruments XDS2xx USB Debug Probe_0]
但我用仿真器连接其他的DM6446开发板都是成功的，板子的JTAG功能正常，想请教一下会是什么问题导致这个情况呢？
