TMDSEMU100V2U-ARM compatibility with TMS320F28027

Hi M,

After taking a look, I cannot recommend using a 10pin ARM connector with the C2000. 

I've come to this conclusion after referring to the following page:
(and specifically the following sections: the header pinout table and the figure in the "Single Device Non-Buffered Configuration" section)
http://processors.wiki.ti.com/index.php/XDS_Target_Connection_Guide#JTAG_header_pinouts

nRESET doesn't look to be equivalent to TRSTn and this will be a problem. 

Assuming the reason for considering this is board space, you can define your own custom adapter/header based on a subset of the 14pin TI JTAG header (and in a footprint that matches your needs).  I am aware of several customers that do this type of thing.  If you do this, I'd refer to the figure in the F28027 datasheet labelled "Emulator Connection Without Signal Buffering for the MCU".  If you utilize an adapter PCB to be between a 14-pin JTAG i/f and your custom interface, I believe the custom interface would only need to consist of around 8pins.

Hopefully this helps!


Thank you,
Brett

Hi Brett,

Thank for your comprehensive response. I understand that nRESET and nTRST are not equivalent, but I don't understand the significance of nTRST. 

In the TMS320F28027 datasheet, it states the following for nTRST: JTAG test reset with internal pulldown. TRST, when driven high, gives the scan system control of the operations of the device. If this signal is not connected or driven low, the device operates in its functional mode, and the test reset signals are ignored.

Could you elaborate further on what these test reset signals are, what functional mode is and how leaving nTRST unconnected/not driving it will affect the functionality?

Thanks!
Mansi