Diff between JTAG and SWD.

[chandu.kurapati]

Hi,

Please can any one explain about the what is the purpose and properties of JTAG and SWD. and what is the major differences between them.

Thanks & Regards,
Chandu.Kurapati.

 

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This sort of reads like a technical marketing blurb at least the first couple of pages.


JTAG is a 4 wire interface that is pretty much ubiquitous on every processor, ic, asic, fpga, cpld, almost any complex digital logic ic in existence. I suspect ARM is trying to push this so they can license it to every one and rake in huge profits. Hence the comments in some forums about SWD can do some stuff that JTAG can't on the Cortex. Seems to me that is something ARM did on purpose so you have to use SWD :thumbsdown: