Thanks Peter.  That's what I like to do as well, but its takes a little more
time to do and the customer is not always willing to pay for it.  In this
particular case, the customer made it the way it is and wants it that way,
so the customer gets what the customer wants.

Jeff Condit

----- Original Message ----- 
From: "Peter Bennett" <[EMAIL PROTECTED]>
To: "Protel EDA Forum" <[EMAIL PROTECTED]>
Sent: Wednesday, September 08, 2004 2:50 PM
Subject: Re: [PEDA] P98 SE Schematic ERC for Electrical Pin Types


> Jeff Condit wrote:
>
> > Hi AJ!
> >
> > I meant P98SE.
> >
> > I guess what I was balking at was not being able to reconfigure a pin's
> > electrical type from schematic.  The reason is that generic PLDs don't
> > really have an electrical type until they are programmed.  Then the pins
can
> > become inputs, outputs, tri-state, or whatever you want.  If in the
library
> > they are all just set to I/O, then the schematic reports a lot of
warnings
> > and can miss some errors.  If you know what you want the pins to be
(which
> > is only sometimes the case) and can set the pin electrical types
> > accordingly, then the ERC is much more meaningful.  This could be done
in
> > the parts editor, but then the part would be wrong on other designs
where
> > the pins are used differently.  Thus, the desire to be able to
characterize
> > them in schematic.
> >
> > Anyway, that was the thought.
> >
> > Jeff Condit
>
> For large programmable parts like Altera's FPGAs, I make a special
schematic
> symbol for each application, with the pins named and positioned (and set
the
> the correct type) to suit the application.  I find it much easier to
> understand the schematic with the pins named for their functions, rather
than
> all being called "I/On"
>
> -- 
> Peter Bennett
> TRIUMF
> 4004 Wesbrook Mall, Vancouver, BC, Canada
> GPS and NMEA info and programs:
> http://vancouver-webpages.com/peter/index.html
>
>
>
>
>
>





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