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

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=517

--- Comment #114 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Cole Poirier from comment #113)

> I would contend that my learning should take a back seat to actually getting
> a working test setup before the tape-out deadline. We can return to teaching
> me after we meet our *critical* deadline.

that would appear to be a logical thing to conclude.  however if you are not
thinking for yourself, and i tell you the wrong thing, the object of the
exercise - to double-check each other's work - is completely defeated, isn't
it?

> VREF is an accurate, constant, low-noise output voltage, that is used as the
> reference for other electrical signals on a device.

excellent.  so if that VREF is disconnected as you ask in comment #98, the
FT232 is in no way going to know what that reference is, is it?

and if GND is also disconnected, how would there ever be a circuit *at all*? 
if you put one wire into a plug, or only connect one terminal to a battery, it
doesn't work, does it?

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