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Date: Tue, 27 Aug 2013 12:07:36 +0200
From: myken <myken AT iae DOT nl>
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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Tutorial: VHDL with gEDA
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Reply-To: geda-user AT delorie DOT com

> 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
>             |

Absolutely clear. I understand your point. Now my question is, is the 
gnetlist vhdl backend incorrect? Because it translates your example as.
ENTITY xor IS
     PORT (
         input_port : OUT Std_Logic);
END xor;

As a result the XOR will not work in vhdl.

>
> 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.
>