Mail Archives: geda-user/2015/12/23/10:30:27
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On Dec 23, 2015, at 1:04 AM, Erich Heinzle (a1039181 AT gmail DOT com) [via =
geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> while writing the utilities to port kicad libraries (schematic =
symbols) and modules (footprints) to gEDA's format, the key differences =
which made direct translation difficult were:
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> gschema:
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> a different set of pin types:
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> in Input
> out Output
> io Input/Output
> oc Open collector
> oe Open emitter
> pas Passive
> tp Totem pole
> tri Tristate (high impedance)
> clk Clock pwrPower/Ground
> Table 1: pintype valuesfor gschem
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> vs kicad's:
> Input
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> Usual input pin
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> Output
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> Usual output
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> Bidirectional
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> Input or Output
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> Tri-state
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> Bus input/output
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> Passive
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> Usual ends of passive components
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> Unspecified
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> Unknown electrical type
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> Power input
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> Power input of a component
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> Power output
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> Power output like a regulator output
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> Open collector
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> Open collector often found in analog comparators
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> Open emitter
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> Open collector sometimes found in logic.
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> Not connected
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> Must be left open in schematic
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> obviously, seamless symbol interchange would be facilitated by having =
equivalent categories of pin type.
> gschema supports arbitrarily large numbers of attributes for elements =
in a symbol, kicad does not.
> This is not a big deal since the harder work of drawing and pin =
labelling and pin type designation is not duplicated/wasted effort.
>=20
I wouldn=92t obsess on this. Pin types are secondary, only used for DRC =
checking. And DRC checking is really dependent on the kind of circuits =
you=92re drawing and the engineering tradition they represent. It=92s =
not =93one size fits all=94. Geda-gaf=92s DRC checking really only fits =
logic design with a single MSI family, which I suspect is only a =
minority of designs. KiCAD=92s looks similarly limited, but with a =
little more detail.
It wouldn=92t be terribly hard to write a DRC back end for gnetlist that =
used KiCAD-style pin types. That=92s the geda-gaf way: write a script to =
adapt the toolkit to the flow.
John Doty Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dwindows-1252"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;"><br><div><div>On Dec 23, 2015, at 1:04 AM, Erich =
Heinzle (<a href=3D"mailto:a1039181 AT gmail DOT com">a1039181 AT gmail DOT com</a>) =
[via <a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>] =
<<a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>>=
wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite"><div style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;"><div>while writing the utilities to port kicad libraries =
(schematic symbols) and modules (footprints) to gEDA's format, the key =
differences which made direct translation difficult =
were:<br><br></div>gschema:<br><br></div><div style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;">a different set of pin types:<br><br>in =
Input<br>out Output<br>io Input/Output<br>oc Open collector<br>oe Open =
emitter<br>pas Passive<br>tp Totem pole<br>tri Tristate (high =
impedance)<br>clk Clock pwrPower/Ground<br><strong>Table =
1:</strong><span class=3D"Apple-converted-space"> </span>pintype =
valuesfor gschem<br><br></div><div style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;">vs kicad's:<br></div><div style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;"><p class=3D"">Input</p><p class=3D"">Usual input pin</p><p =
class=3D"">Output</p><p class=3D"">Usual output</p><p =
class=3D"">Bidirectional</p><p class=3D"">Input or Output</p><p =
class=3D"">Tri-state</p><p class=3D"">Bus input/output</p><p =
class=3D"">Passive</p><p class=3D"">Usual ends of passive =
components</p><p class=3D"">Unspecified</p><p class=3D"">Unknown =
electrical type</p><p class=3D"">Power input</p><p class=3D"">Power =
input of a component</p><p class=3D"">Power output</p><p class=3D"">Power =
output like a regulator output</p><p class=3D"">Open collector</p><p =
class=3D"">Open collector often found in analog comparators</p><p =
class=3D"">Open emitter</p><p class=3D"">Open collector sometimes found =
in logic.</p><p class=3D"">Not connected</p><p class=3D"">Must be left =
open in schematic</p><br></div><div style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;">obviously, seamless symbol interchange would be facilitated by =
having equivalent categories of pin type.<br></div><div =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: auto; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; widows: auto; word-spacing: =
0px; -webkit-text-stroke-width: 0px;">gschema supports arbitrarily large =
numbers of attributes for elements in a symbol, kicad does not.<br>This =
is not a big deal since the harder work of drawing and pin labelling and =
pin type designation is not duplicated/wasted effort.<br></div><br =
class=3D"Apple-interchange-newline"></blockquote><br></div><div>I =
wouldn=92t obsess on this. Pin types are secondary, only used for DRC =
checking. And DRC checking is really dependent on the kind of circuits =
you=92re drawing and the engineering tradition they represent. It=92s =
not =93one size fits all=94. Geda-gaf=92s DRC checking really only fits =
logic design with a single MSI family, which I suspect is only a =
minority of designs. KiCAD=92s looks similarly limited, but with a =
little more detail.</div><div><br></div><div>It wouldn=92t be terribly =
hard to write a DRC back end for gnetlist that used KiCAD-style pin =
types. That=92s the geda-gaf way: write a script to adapt the toolkit to =
the flow.</div><br><div apple-content-edited=3D"true">
<span class=3D"Apple-style-span" style=3D"border-collapse: separate; =
border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; text-align: auto; =
-khtml-text-decorations-in-effect: none; text-indent: 0px; =
-apple-text-size-adjust: auto; text-transform: none; orphans: 2; =
white-space: normal; widows: 2; word-spacing: 0px; "><p style=3D"margin: =
0.0px 0.0px 0.0px 0.0px"><font face=3D"Helvetica" size=3D"3" =
style=3D"font: 12.0px Helvetica">John Doty<span =
class=3D"Apple-converted-space"> <span =
class=3D"Apple-converted-space"> </span><span =
class=3D"Apple-converted-tab"> <span =
class=3D"Apple-converted-space"> </span></span></span>Noqsi =
Aerospace, Ltd.</font></p><p style=3D"margin: 0.0px 0.0px 0.0px =
0.0px"><a href=3D"http://www.noqsi.com/">http://www.noqsi.com/</a></p><p =
style=3D"margin: 0.0px 0.0px 0.0px 0.0px"><font face=3D"Helvetica" =
size=3D"3" style=3D"font: 12.0px Helvetica"><a =
href=3D"mailto:jpd AT noqsi DOT com">jpd AT noqsi DOT com</a></font></p><br =
class=3D"Apple-interchange-newline"></span>
</div>
<br></body></html>=
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