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Date: Mon, 4 Mar 2013 07:23:27 -0800
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Subject: Re: [geda-user] Unterminated logic signals
From: Ouabache Designworks <z3qmtr45 AT gmail DOT com>
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On Sun, Mar 3, 2013 at 7:14 PM, Patrick Doyle <wpdster AT gmail DOT com> wrote:

> Hello Experts!
> I have a question for you...
>
> I have a PCB I purchased from a vendor that has a 15 pin connector on it,
> of which only 8 pins have defined functions.  (The functions of the other 7
> pins are undefined by the manufacturer of the board and may or may not be
> connected to logic on their board.  I have asked to what those pins are
> connected, but haven't heard anything back yet).  Of the 8 pins with
> defined functions, I use only 7.  I have a cable drawing that specifies
> which 7 pins should be connected at each end of the cable.
>
> The problem is, our manufacturing guys built (or allowed a 3rd party to
> build) cables with all 15  pins in the connector populated.  At the other
> end, they just cut the unused 8 wires and populated the connector with the
> 7 signals I use.
>
> I am trying to decide whether I need to tell our manufacturing guys to
> rework the cables or not.  How much do you think it matters that there
> might be digital logic on the PCB driving signals down those unused wires
> in my cable?  The cable itself is shielded, but I wonder what sort of cross
> talk the unterminated signals might cause.  (I also worry a little bit
> about the clipped ends shorting together, but for the purpose of this
> question, I'm going to assume (ha ha) that they insulated each end after
> they clipped it).
>
> What do you folks think?
>
> --wpd
>
>

If you don't fix it and you have any problems at all then you will waste a
lot of time proving that the problems are not due to these extra wires
before you move on to find the real issues.


John Eaton

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<br><br><div class=3D"gmail_quote">On Sun, Mar 3, 2013 at 7:14 PM, Patrick =
Doyle <span dir=3D"ltr">&lt;<a href=3D"mailto:wpdster AT gmail DOT com" target=3D"=
_blank">wpdster AT gmail DOT com</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex">
Hello Experts!<div>I have a question for you...</div><div><br></div><div>I =
have a PCB I purchased from a vendor that has a 15 pin connector on it, of =
which only 8 pins have defined functions. =A0(The functions of the other 7 =
pins are undefined by the manufacturer of the board and may or may not be c=
onnected to logic on their board. =A0I have asked to what those pins are co=
nnected, but haven&#39;t heard anything back yet). =A0Of the 8 pins with de=
fined functions, I use only 7. =A0I have a cable drawing that specifies whi=
ch 7 pins should be connected at each end of the cable.</div>


<div><br></div><div>The problem is, our manufacturing guys built (or allowe=
d a 3rd party to build) cables with all 15 =A0pins in the connector populat=
ed. =A0At the other end, they just cut the unused 8 wires and populated the=
 connector with the 7 signals I use.</div>


<div><br></div><div>I am trying to decide whether I need to tell our manufa=
cturing guys to rework the cables or not. =A0How much do you think it matte=
rs that there might be digital logic on the PCB driving signals down those =
unused wires in my cable? =A0The cable itself is shielded, but I wonder wha=
t sort of cross talk the unterminated signals might cause. =A0(I also worry=
 a little bit about the clipped ends shorting together, but for the purpose=
 of this question, I&#39;m going to assume (ha ha) that they insulated each=
 end after they clipped it).</div>


<div><br></div><div>What do you folks think?</div><div><br></div><div>--wpd=
</div><div><br></div></blockquote><div><br><br>If you don&#39;t fix it and =
you have any problems at all then you will waste a lot of time proving that=
 the problems are not due to these extra wires before you move on to find t=
he real issues.<br>
<br><br>John Eaton<br><br>=A0<br></div></div><br>

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