Rats Nest Incorrect Wiring

Rene_Poschl · November 13, 2017, 10:31pm

Did you try the highlight net tool mentioned by @bobc?
Did you try to recreate the netlist and reimport it? (Do you perhaps get an error message when importing?)

And you never answered my request to state your kicad version.

snoopy20 · November 13, 2017, 10:33pm

I’m reimporting the netlist several times to correct errors in the schematic, but it persists.

Where’s the highlight tool (I’m completely new to pcbnew)?

Rene_Poschl · November 13, 2017, 10:35pm

Right tool bar.

HiGreg · November 13, 2017, 10:38pm

You can get the KiCad version number from the Help > About… menu item. Probably best to screen shot all the version information.

Rene_Poschl · November 13, 2017, 10:40pm

He gave this information above. (Thanks @kiki for telling me about it.)

HiGreg · November 13, 2017, 10:47pm

The pins on the schematic are not numbered the same as the footprint.

Footprints usually go 1-8 starting at top left counting leftward/CCW.

Your symbol is

layout    1 2 3 4 5 6 7 8
schematic 2 1 3 4 5 6 8 7

If I’m reading that correctly. In which case your footprint ratsnest’s are correct.

Rene_Poschl · November 13, 2017, 10:59pm

The ordering of the pins on the symbol does not need to be the same as in the footprint.

Assuming the red numbers in his screenshot are the pin numbers of the symbol then the ratsnet does not seem to connect the same pads as one would expect from the schematic connections.

Greg · November 13, 2017, 11:02pm

Sounds like a small test case using only the IC in question, along with something like an 8 pin header could clear things up quickly, and if the issues persisted, could be shared with the forum.

It would also be good to show the rat’s nest for the case when you have the footprint rotated by 90 degrees (to see if it is a rendering issue with overlapping lines). And to wire up tracks to see what is allowed.

HiGreg · November 13, 2017, 11:14pm

Agreed. Look again at Q27 layout. The white numbers are consecutive and leftward/CCW while the symbol has a slightly different pin order. I agree this is totally acceptable. And it means the ratsnets is correct according to pin numbers, not position.

Am I missing something?

HiGreg · November 13, 2017, 11:17pm

Dang it! Sorry for my confusion. I looked again and layout is 1-2, 3-4. While schematic is 1-3, 2-4.

Sorry for my wrong interpretation!

Rene_Poschl · November 13, 2017, 11:20pm

Sprig · November 13, 2017, 11:31pm

@Rene_Poschl I was just doing exactly that.

The only suggestion I have is to suggest generating the Netlist in Eeschema again, then re-reading the Netlist in PcbNew.

davidsrsb · November 13, 2017, 11:39pm

Search the netlist file and copy the Q27 part here. There is nothing wrong with having pins out of order in a schematic symbol.

snoopy20 · November 14, 2017, 7:39pm

From the netlist:

(net (code 1) (name "Net-(Q27-Pad1)")
  (node (ref Q27) (pin 1))
  (node (ref Q27) (pin 3)))
(net (code 2) (name "Net-(Q27-Pad2)")
  (node (ref Q27) (pin 2))
  (node (ref R40) (pin 1))
  (node (ref Q27) (pin 4)))

Forum won’t allow attachments so here’s the lib data:-

EESchema-LIBRARY Version 2.3
#encoding utf-8

DMP4025LSD

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F1 “DMP4025LSD” -230 -340 50 H V L CNN
F2 “SMD_Packages:SOIC-8-N” -415 0 50 V I C CIN
F3 “” -5 195 50 V I L CNN
DRAW
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P 3 0 1 0 145 120 145 55 195 55 N
P 3 0 1 0 145 120 145 55 195 55 N
P 3 0 1 0 145 120 145 55 195 55 N
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 -145 -15 -145 -5 -120 5 -145 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 5 155 -15 155 -5 130 5 155 F
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 -110 145 -110 145 -145 195 -145 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 4 0 1 0 45 120 145 120 145 155 195 155 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 -145 -155 -145 -155 -220 -5 -220 -5 -185 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
P 5 0 1 0 -205 155 -155 155 -155 230 -5 230 -5 195 N
X S 1 -305 55 100 R 50 50 1 1 P
X S 2 -305 155 100 R 50 50 1 1 P
X S 3 -305 -45 100 R 50 50 1 1 P
X G 4 -305 -145 100 R 50 50 1 1 P
X D 5 295 -145 100 L 50 50 1 1 P
X D 6 295 -45 100 L 50 50 1 1 P
X D 7 295 155 100 L 50 50 1 1 P
X D 8 295 55 100 L 50 50 1 1 P
ENDDRAW
ENDDEF

#End Library

Joan_Sparky · November 14, 2017, 10:16pm

@bobc posted the answer 2 times already (first time as post #5 even - remarkable - you just know when a person has experienced this bug often).
You’re dealing with a graphical artifact in the PCBnew canvas.
Overlapping ratsnest lines (at least in the legacy canvas) cause that they vanish for that stretch.
I think the OpenGL canvas shows them.
This 99.9% happens at IC pins, as those are all in a row and at the same vertical/horizontal coordinate.
hit [F11] in PCBnew to confirm

davidsrsb · November 14, 2017, 11:23pm

That is enough to see that the netlist is correct, pins 1-3 and 2-4 connected, so @Joan_Sparky has the true answer, a graphics drawing artifact. As soon as you attempt to add tracks in pcbnew, the rats nest will draw better.

snoopy20 · November 15, 2017, 8:05am

And indeed it does. At first I thought it may lead to incorrect wiring but then I found it won’t allow incorrect wires to be drawn, so it’s not a biggy.

Also the rats-nest frequently disappears. Switching to OpenGL and back resolves it. From searching I can see it’s a 6yr old bug.