Forums

Re: Debugger on multichip JTAG chains

Started by Martin.J Thompson January 15, 2002
Hi Rick,

>I could use some help with a design I am working on. I am using the
>TMS320C6711B along with the MSP430F148 and two Xilinx FPGAs. I would like
>to use all four devices in a single JTAG chain. But I understand that this
>is not a good idea as the different vendor's tools will not work compatibly.
>

You should be able to set the devices you are not interested in into BYPASS
mode, but the early versions of the C6711 were not JTAG-compliant (according to
the errata sheet)! Who's emulator are you using, they may have different
capabilities - I dunno.

>Is this correct? Will I not be able to use the JTAG debugger on the
>TMS320C6711 and MSP430F148 if I have the Xilinx parts in the chain? I have
>viewed the JTAG documentation available on the TI web site. I still have
>not been able to determine if the JTAG debugger will operate with the
>Xilinx parts in the JTAG chain. I can't even tell if the TMS320C6711 and
>MSP430F148 will be compatible.
>

I have no idea on this I'm afraid - I wussed out and put our FPGAs on a separate
chain from the DSP!

>I am not so worried about using the Xilinx tools. I don't expect to need to
>use the Xilinx debugger. The Xilinx chips are in the chain for boundary scan.
>
>BTW, does anyone know how to use the TI emulator as a JTAG controller for
>boundary scan? Is there documentation on that? Has anyone done boundary
>scan before? What did you use as a controller?
>

Not seen anything on this, but I doubt it. You'll either have to get another
piece of hardware, or if the Xilinx JTAG pod is anything like the Altera
Byteblaster (ie a TTL buffer on the parallel port) you could always write your
own :-)

Cheers,
Martin

--
Martin Thompson BEng(Hons) CEng MIEE
TRW Conekt
Stratford Road, Solihull, B90 4GW. UK
Tel: +44 (0)121-627-3569 -