Mike,
I agree 100% the matched length
function as it stands in 99SE is
to coin a Chris Farley phrase
"Absolutely Freekin" Useless.
I would be almost happy, like you said,
even if it did add to longest, as long
as it matched all in one shot properly, even though
you say it adds to the longest I did not verify that again as I gave up
after 10 tries of not even close to a match.
Also I agree adding to the longest too is kind
of useless unless the longest one still needed to be longer
because of some delay value.
I will also be looking at DXP very soon,
it's funny the sales staff asked if I could look at the
movie to spend less time evaluating this new product
to see all of the new features quicker.
( I did mention I was time constrained) but in all honesty
knowing that there are many things in 99SE that
are menu picks but just don't work, or in other words
don't work even close to an expectation, I cannot live with this next time
around. The only way to really
evaluate DXP is use the full function demo to verify
these functions work as advertized.
I hope to get that time very soon.
Bob Wolfe

----- Original Message -----
From: "Michael Reagan (EDSI)" <[EMAIL PROTECTED]>
To: "Protel EDA Forum" <[EMAIL PROTECTED]>
Sent: Saturday, August 17, 2002 10:34 PM
Subject: Re: [PEDA] Matched Lenghth Constraint


> Clive,
> I was waiting until all of the replies were in before responding about
> Protel's matched lengths.  You are right it does not work, or does not
work
> well.   My reasons for it not working well are the following.
>
> In all of the cases that I have had to match length,  my objective was to
> evaluate  the longest length,   This became my critical length or
yardstick.
> My objective was to  increase the shortest to match the longest.
There
> is no reason to add more trace to the longest trace unless you are
> intentionally adding delay.     The longest trace  should be the
"yardstick"
> for  the other traces to match.   If you use Protel's equalizer it will
> also readjust the longest trace.   This  feature has never worked on any
> version of Protel.    I am not even sure it works in Spectra without
adding
> length to the longest trace.  Time will tell if it works on DXP.
>
>
> I think I need to join the DXP forum to see if this was fixed.
>
> Mike Reagan
> EDSI
> Frederick
>
>
>
>
>
>
>
> ----- Original Message -----
> From: Robert M. Wolfe <[EMAIL PROTECTED]>
> To: Protel EDA Forum <[EMAIL PROTECTED]>
> Sent: Saturday, August 17, 2002 11:20 AM
> Subject: Re: [PEDA] Matched Lenghth Constraint
>
>
> > Clive,
> > I gave up after about ten tries on the matched length,
> > just figured it did not work. It did add some
> > serpentine, but again after about ten tries the lenghts
> > were still not even close to being matched.
> > Seems kind of rediculous to have to run it
> > multiple times? It should do it in one shot in my mind.
> > Bob Wolfe
> > ----- Original Message -----
> > From: <[EMAIL PROTECTED]>
> > To: "Protel EDA Forum" <[EMAIL PROTECTED]>
> > Sent: Tuesday, August 13, 2002 6:36 PM
> > Subject: Re: [PEDA] Matched Lenghth Constraint
> >
> >
> > >
> > >
> > > Matched length works very well.
> > > To implement the equalize netlengths feature, you have to define a
> > netclass with
> > > the nets you want to equalize.
> > > Then go to Design Rules/High Speed/Matched Length and set the
> attributes.
> > > Depending
> > > on how much room on the board you have, set the amplitude and gap for
> the
> > > largest that
> > > can be fitted.
> > > Then run Tools/Equalize Net Length a couple of times to progressivly
add
> > > sections.
> > >
> > > Usually a couple of runs are required as Protel only 'adds' 1 section
at
> a
> > time.
> > > It works out which net in the netclass is the longest and adds
sections
> to
> > the
> > > other
> > > nets to bring them up. The amplitude and gap can be reduced in later
> runs
> > to
> > > have
> > > a finer tolarence.
> > > You can then do a DRC to check the lengths. DRC takes the shortest
> > track/net in
> > > the netclass
> > > and compares the other nets to it
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > "Robert M. Wolfe" <[EMAIL PROTECTED]> on 08/13/2002 10:55:53 PM
> > >
> > > Please respond to "Protel EDA Forum" <[EMAIL PROTECTED]>
> > >
> > > To:   "Protel EDA Forum" <[EMAIL PROTECTED]>
> > > cc:    (bcc: Clive Broome/sdc)
> > >
> > > Subject:  Re: [PEDA] Matched Lenghth Constraint
> > >
> > >
> > >
> > > Well ADEEL,
> > > I am afraid that to actually have the system (99SE, don't
> > > know about DXP) match these leghts it will not do it,
> > > I was told any auto-router function, and this is one
> > > will not ahere to these rules. I tried it a few times where
> > > there was plenty of room to match the lengths
> > > of a delay loop and they were not even close
> > > so eneded up having to manually route these.
> > > I would also love to hear if there was a way in 99SE
> > > to get the system to match these lengths.
> > > Bob Wolfe
> > > ----- Original Message -----
> > > From: "Adeel Malik" <[EMAIL PROTECTED]>
> > > To: "Protel EDA Forum" <[EMAIL PROTECTED]>
> > > Sent: Tuesday, August 13, 2002 9:36 AM
> > > Subject: [PEDA] Matched Lenghth Constraint
> > >
> > >
> > > > Hi All,
> > > >          I want to apply a matched-length constraint to the signals
> > > > connected to the bus. In the Protel Design Rule dialog, there are
> mainly
> > 2
> > > > parameters to specify, one is Tolerance (whose purpose is obvious)
and
> > the
> > > > other is Connection style. In connection style there are three
options
> > 1)
> > > 90
> > > > degree 2) 45 degree and 3) Rounded. Alongwith them there are also
> > options
> > > of
> > > > Amplitude and Gap.I couldn't understand these options so Can someone
> > tell
> > > me
> > > > how these options are utilized effectively while routing a bus
running
> > at
> > > > 66MHz.
> > > >
> > > > Regards,
> > > > ADEEL MALIK
> > > >
> > > >
> > > >
> > > >
> ************************************************************************
> > > > * Tracking #: 0E65D282D6969F409D601E4E0E422F8499FF2F09
> > > > *
> > > >
> ************************************************************************
> > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
>


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