Protel DXP - short circuit generated from autorouter ?

  • Thread starter Nicolas Nickisch
  • Start date
N

Nicolas Nickisch

Guest
Hi NG,
I am not experienced and installed the demo of Protel DXP.

My laaout has been routed with the message "roiting finished, 0 unrouted"
or something like this.
For me this was the signal that anything is o.k.

After inspecting the generated layouts, I found at least two connections
that were positioned at the same place on the top layer generating a short
circuit.

These 2 connections have the some piece of copper over a distance of about
2 cm.

I don't think that is caused by bad print quality and "optimistic" clearance
parameter, because all other parts of the layout is o.k.

So I routed the layout again and found the same problemm again - at another
place.

The message window said something about "contentions".

is there any way to avoid such mistakes ?

Nicolas Nickisch
 
Nicolas Nickisch wrote:
Hi NG,
I am not experienced and installed the demo of Protel DXP.

My laaout has been routed with the message "roiting finished, 0 unrouted"
or something like this.
For me this was the signal that anything is o.k.

After inspecting the generated layouts, I found at least two connections
that were positioned at the same place on the top layer generating a short
circuit.

These 2 connections have the some piece of copper over a distance of about
2 cm.

I don't think that is caused by bad print quality and "optimistic" clearance
parameter, because all other parts of the layout is o.k.

So I routed the layout again and found the same problemm again - at another
place.

The message window said something about "contentions".

is there any way to avoid such mistakes ?
Click to expand...

Use better software? :cool:

Leon
--
Leon Heller, G1HSM
Email: aqzf13@dsl.pipex.com
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html
 
On Thu, 08 Jan 2004 13:32:22 +0000, Leon Heller wrote:

Nicolas Nickisch wrote:
Hi NG,
I am not experienced and installed the demo of Protel DXP.

My laaout has been routed with the message "roiting finished, 0 unrouted"
or something like this.
For me this was the signal that anything is o.k.

After inspecting the generated layouts, I found at least two connections
that were positioned at the same place on the top layer generating a short
circuit.

These 2 connections have the some piece of copper over a distance of about
2 cm.

I don't think that is caused by bad print quality and "optimistic" clearance
parameter, because all other parts of the layout is o.k.

So I routed the layout again and found the same problemm again - at another
place.

The message window said something about "contentions".

is there any way to avoid such mistakes ?


Use better software? :cool:

Leon
Click to expand...
The "SITUS" autorouter in DXP will allow itself to build in contentions -
conflicts - with the idea that it may be able to clean them up in a later
pass. It often will complete 100% routing with a few of these remaining.
You can set the design rules to prevent this by weighting zero contentions
higher than 100% completion.

Bob
 
Is there any place to get a list of these catastrophical mistakes ?

Nicolas Nickisch

"Bob Stephens" <stephensdigital@earthlink.net> schrieb im Newsbeitrag
news:1phrj1ia0tkfo.n6pvqpfmp0py.dlg@40tude.net...
On Thu, 08 Jan 2004 13:32:22 +0000, Leon Heller wrote:

Nicolas Nickisch wrote:
Hi NG,
I am not experienced and installed the demo of Protel DXP.

My laaout has been routed with the message "roiting finished, 0
unrouted"
or something like this.
For me this was the signal that anything is o.k.

After inspecting the generated layouts, I found at least two
connections
that were positioned at the same place on the top layer generating a
short
circuit.

These 2 connections have the some piece of copper over a distance of
about
2 cm.

I don't think that is caused by bad print quality and "optimistic"
clearance
parameter, because all other parts of the layout is o.k.

So I routed the layout again and found the same problemm again - at
another
place.

The message window said something about "contentions".

is there any way to avoid such mistakes ?


Use better software? :cool:

Leon

The "SITUS" autorouter in DXP will allow itself to build in contentions -
conflicts - with the idea that it may be able to clean them up in a later
pass. It often will complete 100% routing with a few of these remaining.
You can set the design rules to prevent this by weighting zero contentions
higher than 100% completion.

Bob
Click to expand...
 
Where Can I find this rule ? "allow short circuit" ?

"Bob Stephens" <stephensdigital@earthlink.net> schrieb im Newsbeitrag
news:1phrj1ia0tkfo.n6pvqpfmp0py.dlg@40tude.net...
On Thu, 08 Jan 2004 13:32:22 +0000, Leon Heller wrote:

Nicolas Nickisch wrote:
Hi NG,
I am not experienced and installed the demo of Protel DXP.

My laaout has been routed with the message "roiting finished, 0
unrouted"
or something like this.
For me this was the signal that anything is o.k.

After inspecting the generated layouts, I found at least two
connections
that were positioned at the same place on the top layer generating a
short
circuit.

These 2 connections have the some piece of copper over a distance of
about
2 cm.

I don't think that is caused by bad print quality and "optimistic"
clearance
parameter, because all other parts of the layout is o.k.

So I routed the layout again and found the same problemm again - at
another
place.

The message window said something about "contentions".

is there any way to avoid such mistakes ?


Use better software? :cool:

Leon

The "SITUS" autorouter in DXP will allow itself to build in contentions -
conflicts - with the idea that it may be able to clean them up in a later
pass. It often will complete 100% routing with a few of these remaining.
You can set the design rules to prevent this by weighting zero contentions
higher than 100% completion.

Bob
Click to expand...
 
On Thu, 8 Jan 2004 16:49:51 +0100, Nicolas Nickisch wrote:

Is there any place to get a list of these catastrophical mistakes ?

Nicolas Nickisch

"Bob Stephens" <stephensdigital@earthlink.net> schrieb im Newsbeitrag
news:1phrj1ia0tkfo.n6pvqpfmp0py.dlg@40tude.net...
On Thu, 08 Jan 2004 13:32:22 +0000, Leon Heller wrote:

Nicolas Nickisch wrote:
Hi NG,
I am not experienced and installed the demo of Protel DXP.

My laaout has been routed with the message "roiting finished, 0
unrouted"
or something like this.
For me this was the signal that anything is o.k.

After inspecting the generated layouts, I found at least two
connections
that were positioned at the same place on the top layer generating a
short
circuit.

These 2 connections have the some piece of copper over a distance of
about
2 cm.

I don't think that is caused by bad print quality and "optimistic"
clearance
parameter, because all other parts of the layout is o.k.

So I routed the layout again and found the same problemm again - at
another
place.

The message window said something about "contentions".

is there any way to avoid such mistakes ?


Use better software? :cool:

Leon

The "SITUS" autorouter in DXP will allow itself to build in contentions -
conflicts - with the idea that it may be able to clean them up in a later
pass. It often will complete 100% routing with a few of these remaining.
You can set the design rules to prevent this by weighting zero contentions
higher than 100% completion.

Bob
Click to expand...
http:\\www.protel.com check out the users forum, it's pretty much a bitch
fest.

Bob
 
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