TMS570LS3137-EP: Driving the nTRST pin?

Hi,

Yes, the XDS200 supports 5-wire JTAG. However, that is highly dependent on the target itself - several devices do not support the nTRST signal and the selection is done as part of the protocol stack - i.e., can't be independently driven. 

Perhaps you mean the nRESET (System Reset) pin, which is a signal that can be driven independently? 

Additional details can be found at:

https://software-dl.ti.com/ccs/esd/documents/xdsdebugprobes/emu_xds_target_connection_guide.html 

Hope this helps,

Rafael

Caleb,

The recommendations for nTRST signal are shown at the XDS Target Connection Guide: 

https://software-dl.ti.com/ccs/esd/documents/xdsdebugprobes/emu_xds_target_connection_guide.html

Pulling down TRST is ok as long as you have it connected to the nTRST signal on the JTAG header of your board - after all, this signal needs to be asserted to allow JTAG communications. 

Does that make sense or did I misunderstand the question? 

Regards,

Rafael

That answers my question. The circuit on the dev board with a pull-up just made me second guess myself.

Thanks!