[Libre-soc-bugs] [Bug 511] Add a test of IO pins to debug/test/test_jtag_tap.py

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=511

--- Comment #10 from Cole Poirier <colepoirier at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #9)
> (In reply to Cole Poirier from comment #8)
> 
> > Any tips on how I should start debugging this to find the source of the
> > error/why the ioconn3.core.i signal is inverted? Should I familiarize myself
> > with the JTAG spec? I started trying to debug this one day last week and was
> > looking through the code in debug and debug/test, as well as trying to
> > figure out the correspondence between your code and staf's c4m-jtag code
> > using the asserts as reference points.
> 
> look through the code, compare it with the gtkwave diagrams, hunt for the
> shift registers being set.
> 
> it will be easier to (temporarily) comment out everything but the set/get
> of the IOconn.
> 
> also perhaps Cesar could help take a look?

That's super helpful, thank you! Oooh the honour of having Cesar's help is not
something I would ever pass up :)

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