[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
Sun Apr 11 01:09:48 BST 2021


--- Comment #117 from Cole Poirier <colepoirier at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #116)
> (In reply to Cole Poirier from comment #115)
> > I see, this only works however if I actually have a proper understanding of
> > electrical engineering, something not possible to do with out imminent
> > deadline.
> slapped wrist! we are all operating at the limit of our knowledge!  have
> confidence that what you do not know can be determined and learned. 

Fumbling around in the dark is difficult *shrugs* :)

> > thus, you said to remove the vref jumper cable, and I did as you directed.
> good.  this disconnects the power supplied *by* the FT232 onto the VCC pin,
> doesn't it?
> look at the PCB, it says 5V on one side, VCC in the middle, and 3.3V on the
> other. removing the jumper disconnects *both* of those from VCC, doesn't it?
> if there is no jumper connecting either of those voltages to VCC, then the
> power supplied to VREF will not fight with the power supplied by the FPGA,
> will it?
> just as i explained very clearly to you on an hour long conversation eight
> weeks ago, and your voice clearly indicated to me that you understood
> everything that i explained.

Right, so given that the current state of the wiki is correct? (I believe it
is, but was confused (as you know) and now would like your confirmation).

> > I'm confused.
> yes, we know :)  this is why the page contains confusing statements.

With the statement I included from jacob last night now removed, what are the
remaining confusing statements? I believe there are none, but would like your

> > How many wires will be going from the ft232r cable to the fpga, what are
> > they labelled, and what colour are they?
> this is your task to complete.  i am focussing on the simulation.

I think I have completed this correctly, I require your double-checking of my

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