[PCB_FORUM] Re: Specctra autorouter - protecting some / ripping up others

From the Specctra Command Reference:

Edit - [Un]Fix Nets
Procedures   |   Command

Function
Fixes or unfixes nets.

Fixing completely isolates a net. Once a net is fixed, the autorouter can 
neither move any part of the net (same as protect) nor route to any point on 
the net. If you fix a net that is completely or partially routed, the wires 
cannot be deleted, or ripped up and rerouted. Wires of fixed nets are treated 
as keepouts and cannot be involved in conflicts.

If your OS is Windows you can find the complete Command Reference in a folder 
labelled "spcmdref".







> 
> From: Dave Seymour <dave.seymour@xxxxxxxxxxxx>
> Date: 2006/07/28 Fri AM 08:21:25 CDT
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] Re: Specctra autorouter - protecting some / ripping up
>  others
> 
> Use the Fix property  in Allegro.
> 
> I believe that Specctra can never change the Fix property.
> Protect and Unprotect in Specctra can allow changes
> to the vias/nets while routing for the UN-fixed elements from
> Allegro.
> 
> Hope this helps.
> 
> dave
> 
> 
> richard moffat wrote:
> 
> >Hello all
> >
> >We have a partially-routed board, with some very carefully hand-routed
> >traces and some other routed lower-speed lines.
> >
> >We wish to try autorouting the rest (with constraints thrown in, of
> >course), but protecting the most critical lines. 
> >
> >I believe Specctra, by default, protects all previously-routed wires. 
> >What do I write in the .do file to tell it it's OK to rip up and
> >re-route some wires?
> >
> >Cheers,
> >Richard
> >
> >  
> >__________________________
> >Richard Moffat
> >PCB CAD Manager
> >Allied Telesis Labs
> >ph. +64 (3) 3393000
> >richard.moffat@xxxxxxxxxxxxxxxxxxx
> >
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> 
> -- 
> Dave Seymour, CID+
> Catapult Communications Inc.
> 800 Perimeter Park Dr, Suite A
> Morrisville, NC 27560
> 
> Direct: (919)653-4249
> Main: (919)653-4180
> Fax: (919)653-4297
> 
> Dave.seymour@xxxxxxxxxxxx
> 
> 
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