Re: gEDA-user: pintype attritubute and gnetlist

["John Luciani" <jluciani@xxxxxxxxx>]

On 1/2/07, Ostheller, Joel A. <JOEL.A.OSTHELLER@xxxxxxxx> wrote:
> >From : http://geda.seul.org/wiki/geda:master_attributes_list
>
>   pintype
>   Each pin must have a pintype=value attribute attached to it and should be
> make hidden. Table 1 shows valid values for
>   this attribute. his attribute is not used extensively in the symbol
> library, but it will be used for DRC and
>   netlisting. xamples: pintype=clk pintype=in pintype=pas
>
> I do not understand why this is needed. Why does PCB need to know if a Pin
> on an IC is an output, input, clock, power, ground, Tristate, etc?

PCB doesn't need to know. The intent of the pintypes is to help prevent
design errors such as connecting an output to an output, and output to gnd, etc.

Unfortunately there are many applications where the design check fails.
For example you could connect the output of a DC-DC to GND to generate
a negative rail. This would generate an error since an output is connected
to ground even though it is valid and common application.

To generate the PCB file and netlist I just use gsch2pcb.

(* jcl *)




--
http://www.luciani.org


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