Trace capturing

Unless you expect to embed this functionality in large numbers of copies of your product, you should instead consider an off-the-shelf logic analyzer from the usual instrumentation suppliers. You will get all the functionality you describe, lots of built-in software and configurability, and a helpdesk to beat-up when things aren't going well.

Many hobbyists make do-it-yourself logic analyzers based on some kind of FPGA+PC combination, but it's labour-intensive stuff. If you need this for your development lab(s), go buy or rent a ready-to-use box. They're not cheap, but it's well-established technology and they work brilliantly.

Hi Jonathan,

But this is a processor with no external bus. (Also its for experimentation). So logic analyser as far as I know wont help here. The idea is to build an emulator which can caputure the Nexus public messages and also write into internal memories of the controller for calibration of variables.

Kind Regards, Ravishankar

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Ravishankar,

Ah. Bad assumption by me. I just (foolishly) assumed that Nexus was yet another regular CPU. Any links I can follow to take a look?

OK, fair enough.

Logic analysers can be persuaded to decode all manner of protocol stuff, but I agree that this sounds a bit too specialised.

Sorry to have misunderstood.

Hi Jonathan,

Nexus is a OnChip mechanism which works in conjunction with the debug port (JTAG). So the debug port controls the device and sets up triggers , the AUX port send out the trace information and takes in trace data. More at the Nexus site: can find through google. One similarity to logic analzysis is the capturing happens synchronous to the clock: in case of LA its memory clock and Nexus its a special nexus output clock. The data though in case of Nexus is variable length and is compressed.

Kind Regards, Ravishankar

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