Re: gEDA-user: taking issue with Symbol creation

[Steven Michalske <smichalske@xxxxxxxxx>]

On Jan 8, 2010, at 9:41 AM, phil wrote:

> John Doty wrote:
>> With the exception of slotted components, of course.
>
> So among pinnumber, pinlabel, and pinseq .... the symbol creator  
> should
> make pinseq the visible attribute because it is this number that will
> get incremented by slottin(?).
>

Think of pinseq as the index to the array of pins on the symbol.
This array may be sparse, i.e. have missing indexes. e.g.  1, 2, 3, 7,  
8, 9

Some flows use the array index to the symbol.
Example: your modeling a mosfet in a SO-8 package.
It has 8 pins, but it's gnucap model only has three nodes.

So pins 1 to 3 are the source, 4 is the gate, and 5 to 8 are the drain.

The model has node 1 as the source, node 2 as the drain, and node 3 as  
the gate

pin 1, a source, would get pinseq 1
pin 4, the gate, would get pinseq 3
pin 5, a drain, would get pinseq 2

The rest of the pins would get arbitrary pinseq assignments, or none  
at all your call.

> You mentioned 'Pinlabel is for hierarchy'.  I am lost on that one,  
> totally.

When you make symbols that represent schematic sheets. so that you can  
easily reuse common schematics.
I like them for multi-channel filters and amplifiers.

Good luck,

Steve


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