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Mail Archives: geda-user/2019/01/30/11:42:29

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From: John Doty <jpd AT noqsi DOT com>
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Subject: Re: [geda-user] Refdes bug or Master Attribute Document on the Wiki
needs update.
Date: Wed, 30 Jan 2019 11:40:50 -0500
References: <9ed059c0-f3c5-1482-169b-f8f1119f3208 AT fastmail DOT com>
<alpine DOT DEB DOT 2 DOT 20 DOT 1901301419360 DOT 1543 AT nimbus>
<alpine DOT DEB DOT 2 DOT 00 DOT 1901301448260 DOT 21900 AT igor2priv>
<alpine DOT DEB DOT 2 DOT 20 DOT 1901301557210 DOT 3182 AT nimbus>
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> On Jan 30, 2019, at 10:16 AM, Roland Lutz <rlutz AT hedmen DOT org> wrote:
>=20
> On Wed, 30 Jan 2019, gedau AT igor2 DOT repo DOT hu wrote:
>> In some systems this is how you do slotting. Each slot is =
<refdes>[a..z]. I haven't used such system, but I have seen this =
convention on schematics produced with those systems.
>=20
> With gEDA/gaf, this wouldn't work.  You'd either have to define =
separate symbols for each slot, or use gEDA/gaf's slotting mechanism and =
set slot=3D1,
> slot=3D2 etc. on each component to change its pin mapping to a given =
slot.

You could have the gnetlist back end assemble the packages. If you =
wanted the right pin numbers in the schematic, you=E2=80=99d have to do =
one of the things above, slightly clumsy for a truly slotted component. =
Separate symbols are fine for multi-part components with distinctly =
different parts. I think lepton-schematic scripting is sufficiently =
flexible that you could make a plug-in that would implement this =
gracefully, but I=E2=80=99m not an expert there.

>=20
> If you have defined the slot number in slot=3D anyway, why would you =
want to
> duplicate it in the refdes?  (This is a serious question.)
>=20
>=20

Matter of style. It gives the reader of the schematic a hint that the =
symbol only represents part of a component. And, as noted above, there =
are cases where the slot mechanism doesn=E2=80=99t apply to a multi-part =
component.

John Doty              Noqsi Aerospace, Ltd.
jpd AT noqsi DOT com




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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jan 30, 2019, at 10:16 AM, Roland Lutz &lt;<a =
href=3D"mailto:rlutz AT hedmen DOT org" class=3D"">rlutz AT hedmen DOT org</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"">On Wed, 30 Jan 2019, <a href=3D"mailto:gedau AT igor2 DOT repo DOT hu" =
class=3D"">gedau AT igor2 DOT repo DOT hu</a> wrote:<br class=3D""><blockquote =
type=3D"cite" class=3D"">In some systems this is how you do slotting. =
Each slot is &lt;refdes&gt;[a..z]. I haven't used such system, but I =
have seen this convention on schematics produced with those systems.<br =
class=3D""></blockquote><br class=3D"">With gEDA/gaf, this wouldn't =
work. &nbsp;You'd either have to define separate symbols for each slot, =
or use gEDA/gaf's slotting mechanism and set slot=3D1,<br =
class=3D"">slot=3D2 etc. on each component to change its pin mapping to =
a given slot.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div>You could have the gnetlist back end assemble the =
packages. If you wanted the right pin numbers in the schematic, you=E2=80=99=
d have to do one of the things above, slightly clumsy for a truly =
slotted component. Separate symbols are fine for multi-part components =
with distinctly different parts. I think lepton-schematic scripting is =
sufficiently flexible that you could make a plug-in that would implement =
this gracefully, but I=E2=80=99m not an expert there.</div><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D""><br class=3D"">If you have defined the slot number in slot=3D =
anyway, why would you want to<br class=3D"">duplicate it in the refdes? =
&nbsp;(This is a serious question.)<br class=3D""><br class=3D""><br =
class=3D""></div></div></blockquote><br class=3D""></div><div>Matter of =
style. It gives the reader of the schematic a hint that the symbol only =
represents part of a component. And, as noted above, there are cases =
where the slot mechanism doesn=E2=80=99t apply to a multi-part =
component.</div><br class=3D""><div class=3D"">
<span class=3D"Apple-style-span" style=3D"border-collapse: separate; =
border-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-ligatures: normal; =
font-variant-caps: normal; font-variant-east-asian: normal; =
font-variant-position: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; text-indent: 0px; text-transform: none; =
orphans: 2; white-space: normal; widows: 2; word-spacing: 0px;"><div =
style=3D"word-wrap: break-word;" class=3D""><span =
class=3D"Apple-style-span" style=3D"border-collapse: separate; =
border-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-ligatures: normal; =
font-variant-caps: normal; font-variant-east-asian: normal; =
font-variant-position: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; text-indent: 0px; text-transform: none; =
orphans: 2; white-space: normal; widows: 2; word-spacing: 0px;"><p =
style=3D"margin: 0px;" class=3D""><font face=3D"Helvetica" size=3D"3" =
style=3D"font-style: normal; font-variant-caps: normal; font-weight: =
normal; font-size: 12px; line-height: normal; font-family: Helvetica;" =
class=3D"">John Doty<span class=3D"Apple-converted-space">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span><span =
class=3D"Apple-converted-tab">&nbsp; &nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span>Noqsi =
Aerospace, Ltd.</font></p><p style=3D"margin: 0px;" class=3D""><a =
href=3D"mailto:jpd AT noqsi DOT com" class=3D"">jpd AT noqsi DOT com</a></p><br =
class=3D"Apple-interchange-newline"></span></div></span><br =
class=3D"Apple-interchange-newline">
</div>
<br class=3D""></body></html>=

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