Mail Archives: geda-help/2011/12/13/13:00:27
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On Dec 12, 2011, at 11:08 PM, Clarke Watson wrote:
> I am new to gschema. I am working on a schematic that includes a =
connector with 400 pins. With such a large part, I'd like to break the =
symbol up into multiple pieces. The last schematic capture tool I used =
was Viewlogic (many years ago!) and it had the capability of doing this. =
Unfortunately, I don't recall the term that was used. The documentation =
for gschem mentions the "numslots" attribute. Can the numslots attribute =
be used for this purpose? Does each slot need to have the same number of =
pins?
>=20
DJ gave you one good way. Another is to create a single pin symbol with =
400 slots. Then just place groups of pins where they make sense. Here's =
a 68 pin example symbol:
It does take a lot of slotdef attributes to do this, but there does not =
appear to be a practical limit for the number you can use. Write a tiny =
program in your favorite scripting language to make the list of =
attributes, and append it to the symbol file. A great advantage of a =
well documented text-based file format.
Another way is to use my pins2gsch script to map a table of pin =
assignments into a non-graphical pseudo-schematic. When I do this, on =
another page I'll draw a bus representing the wires going to the =
connector, and then terminate the bus at a degenerate symbol (just a box =
and text, no pins) representing the connector that also serves as a =
place to attach the necessary attributes for layout and BOM (mainly =
refdes and footprint).
John Doty Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com
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<html><head></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
"><br><div><div>On Dec 12, 2011, at 11:08 PM, Clarke Watson =
wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite"><span class=3D"Apple-style-span" style=3D"border-collapse: =
separate; font-family: Helvetica; font-style: normal; font-variant: =
normal; font-weight: normal; letter-spacing: normal; line-height: =
normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; =
text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; =
-webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: =
0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div>I am new =
to gschema. I am working on a schematic that includes a connector with =
400 pins. With such a large part, I'd like to break the symbol up into =
multiple pieces. The last schematic capture tool I used was =
Viewlogic (many years ago!) and it had the capability of doing this. =
Unfortunately, I don't recall the term that was used. The =
documentation for gschem mentions the "numslots" attribute. Can the =
numslots attribute be used for this purpose? Does each slot need to have =
the same number of pins?</div></span><br =
class=3D"Apple-interchange-newline"></blockquote><br></div><div>DJ gave =
you one good way. Another is to create a single pin symbol with 400 =
slots. Then just place groups of pins where they make sense. Here's a 68 =
pin example symbol:</div><div><br></div><div></div></body></html>=
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v 20040111 1
T 400 500 8 10 1 1 0 0 1
refdes=J?
P 0 200 300 200 1 0 0
{
T 800 400 5 10 0 0 0 0 1
pinnumber=1
T 800 200 5 10 0 0 0 0 1
pinseq=1
T 800 100 5 10 0 0 0 0 1
pinlabel=1
T 800 300 5 10 0 0 0 0 1
pintype=pas
}
T 600 200 8 10 1 1 0 4 1
slot=1
T 0 0 8 10 0 0 0 0 1
numslots=68
T 0 100 8 10 0 0 0 0 1
slotdef=1:1
T 0 200 8 10 0 0 0 0 1
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T 0 6800 8 10 0 0 0 0 1
slotdef=68:68
T 700 600 8 10 0 1 0 0 1
device=DD68F
T 1300 800 8 10 0 1 0 0 1
footprint=DD68F
L 300 200 500 400 3 0 0 0 -1 -1
L 300 200 500 0 3 0 0 0 -1 -1
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<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div></div><div><br></div><div>It does take a lot of slotdef attributes to do this, but there does not appear to be a practical limit for the number you can use. Write a tiny program in your favorite scripting language to make the list of attributes, and append it to the symbol file. A great advantage of a well documented text-based file format.</div><div><br></div><div>Another way is to use my pins2gsch script to map a table of pin assignments into a non-graphical pseudo-schematic. When I do this, on another page I'll draw a bus representing the wires going to the connector, and then terminate the bus at a degenerate symbol (just a box and text, no pins) representing the connector that also serves as a place to attach the necessary attributes for layout and BOM (mainly refdes and footprint).</div><br><div>
<span class="Apple-style-span" style="font-size: 12px; "><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">John Doty<span class="Apple-converted-space"> <span class="Apple-converted-space"> </span><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>Noqsi Aerospace, Ltd.</font></p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><a href="http://www.noqsi.com/">http://www.noqsi.com/</a></p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica"><a href="mailto:jpd AT noqsi DOT com">jpd AT noqsi DOT com</a></font></p><br class="Apple-interchange-newline"></span>
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