[Libre-soc-bugs] [Bug 517] Define JTAG pins and set up with litex for ulx3s85f

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Sat Apr 10 01:58:50 BST 2021


--- Comment #104 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Cole Poirier from comment #103)
> Ok so no VCC but yes GND?

yes. you nearly always need gnd for a return path for the current. if you don't
have a return path right near the signal lines, it will totally mess up high
speed signals, due to the extra inductance caused by the loop through the
signal and off to a ground somewhere.

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