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

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Tue Oct 20 21:23:18 BST 2020


--- Comment #9 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(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?

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