Hello all,
I designed a custom board, referring to the 28377d control card schematics.
Now, I met two issues and have been struggling for several days.
The first is that JTAG connection always fails when I do the test connection, using CCS6 and BlackHawk USB200 Emulator (compatible with Texas Instruments XDS2xx USB emulator)
The test result is below:
[Start: Texas Instruments XDS2xx USB Emulator_0]
Execute the command:
%ccs_base%/common/uscif/dbgjtag -f %boarddatafile% -rv -o -S integrity
[Result]
-----[Print the board config pathname(s)]------------------------------------
C:\Users\xx\AppData\Local\TEXASI~1\CCS\
ti\0\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 'May 21 2014'.
The library build time was '18:02:25'.
The library package version is '5.1.507.0'.
The library component version is '35.34.40.0'.
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 Emulator_0]
*************************************************************************
This emulator works fine with the control card. so it is not the cause. I worried about the hardware. so I do test the JTAG signals. TCK and TDI has pulse signals, but TDO is stucked at zero. I check the connection and all connections seems fine.
Another issue is about the reset signal XRS and Error pin ERORSTS. I find XRS will toggle with 920 us high level and 40 us low level, and ERORSTS toggles with 920 us low level but 40 us high level correspondingly.
Then, I test TI control card. Its XRS also toggles but with16 ms high level and 40 us low level, and ERORSTS is zero voltage.
I am not sure why this happens and how to explain my issues and solve them.
I already re-solder two DSP chips on my board, and the same issues occur. And all the power pins VDDIO, VDD and VDDA have stable voltage 3.3v and 1.2V. so, I don't think it is because of the improper soldering.
Also, I find that there are two posts which show the similar issues, but no final solution is provided yet.
http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/373383
http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/385895
Could anyone point out any issues with this design or provide some suggestions or experiences?
Best Regards,
Bo