Board DRC - Supposed to Generate Errors/Warnings on Unrouted Nets?

On 09/10/10 20:56, Michael Sansom wrote:

I just noticed that I have two unrouted nets on my board layout (i.e.

the ratsnets lines are visible but no copper tracks connect) and the DRC

isn't generating any errors/warning.  Is this correct?  What am I doing

wrong, I've never seen a DRC that wouldn't flag unrouted signals.

If the DRC were to warn about unrouted signals, it would ave to

run a complete RATSNEST (including processing all polygons) every

time the DRC is run. Clearly this is not desirable.

Klaus Schmidinger

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Klaus Schmidinger                       Phone: +49-8635-6989-10

CadSoft Computer GmbH                   Fax:   +49-8635-6989-40

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"Klaus Schmidinger" <Klaus.Schmidinger@cadsoft.de> wrote in message

news:i6kke9$d83$1@cheetah.cadsoft.de...

If the DRC were to warn about unrouted signals, it would ave to

run a complete RATSNEST (including processing all polygons) every

time the DRC is run. Clearly this is not desirable.

It should say "warning: Ratsnest has not been done. There might be

airwires."

This also touches a similar subject (Topic "ERC/DRC rerun?").  I suggested

some indicator to show that ratsnest is needed.

So if Eagle knows there has been changes after last ratsnest, it should warn

in the DRC window. If there are no changes, it should report if there are

airwires or not.

"Klaus Schmidinger" <Klaus.Schmidinger@cadsoft.de> wrote in message

news:i6kke9$d83$1@cheetah.cadsoft.de...

If the DRC were to warn about unrouted signals, it would ave to

run a complete RATSNEST (including processing all polygons) every

time the DRC is run. Clearly this is not desirable.

It should say "warning: Ratsnest has not been done. There might be

airwires."

This also touches a similar subject (Topic "ERC/DRC rerun?").  I suggested

some indicator to show that ratsnest is needed.

So if Eagle knows there has been changes after last ratsnest, it should warn

in the DRC window. If there are no changes, it should report if there are

airwires or not.

I like it the way it is.

It is good to run a RATSNEST to verify that you are done.

It is also good to be sure that any hidden airwires are accounted for too.

If this does get added to DRC I would want to be able to skip this check.

I run DRC periodically while routing and there would be unrouted airwires.

"Morten Leikvoll" <mleikvol@yahoo.nospam> wrote in message

news:i6kmn1$nsi$1@cheetah.cadsoft.de...

"Klaus Schmidinger" <Klaus.Schmidinger@cadsoft.de> wrote in message

news:i6kke9$d83$1@cheetah.cadsoft.de...

>> If the DRC were to warn about unrouted signals, it would ave to

>> run a complete RATSNEST (including processing all polygons) every

>> time the DRC is run. Clearly this is not desirable.

>

It should say "warning: Ratsnest has not been done. There might be

airwires."

This also touches a similar subject (Topic "ERC/DRC rerun?").  I suggested

some indicator to show that ratsnest is needed.

So if Eagle knows there has been changes after last ratsnest, it should

warn in the DRC window. If there are no changes, it should report if there

are airwires or not.

>