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Date: Tue, 27 Aug 2013 13:53:35 +0400
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Subject: Re: [geda-user] Tutorial: VHDL with gEDA
From: Vladimir Zhbanov <vzhbanov AT gmail DOT com>
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Pin types are related to pins which are parts of their symbols.
pintype= is an attribute of a pin, not a symbol attribute, so it
specifies the signal direction for the pin. Thus, if a pin is
INPUT for you XOR symbol, it should have the pintype=in attribute
but the port symbol representing it within the sub-schematic is
not a pin. The pin of the port should have pintype=out since it is
an output for _the port symbol_.

I hope, the signal direction shown below should clear this.

external   | XOR subcircuit
pin        |
           | -----------\   pin of the port symbol
-->INPUT-->| |INPUT PORT >-->OUTPUT of the port-->
pintype=in | -----------/   pintype=out
           |

I noticed one issue with the ipad symbol, though. As far as I know,
the pintype attribute values should be written in lower case
according to the Master Attribute List Document.