[PCB_FORUM] Re: apply constraints to net portion of xnet only

Thank you for your responses Man, Richard and Dennis.  I really appreciate it.  
I am currently using version 15.5.1, but this may provide the incentive to move 
to 15.7.
 
Chris

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx on behalf of Dennis Nagle
Sent: Thu 3/22/2007 3:22 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: apply constraints to net portion of xnet only


Hello All,
 
As of 15.7, XNet names can be controlled with the property CDS_XNET_NAME. Legal 
values are Select and Ignore to either assure that the name of a particular Net 
ends up as the XNet name or won't, respectively. You can also control the XNet 
name interactively in Constraint Manager: RMB and select Rename on the XNet - 
it will present both net names in the rename dialog.
 
-Dennis
Cadence

________________________________

        From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of richard moffat
        Sent: Thursday, March 22, 2007 5:58 PM
        To: icu-pcb-forum@xxxxxxxxxxxxx
        Subject: [PCB_FORUM] Re: apply constraints to net portion of xnet only
        
        
        
        Hi
         
        The XNET assumes the net with the 'lesser alpha-numeric' name.
         
        For example, if one side is named "SRC_PCI_CLK" and the other 
"PCI_CLK", then
        "PCI_CLK" will be the XNET name.
         
        Regards,
        Richard


        >>> "Christopher Nunn" <cnunn@xxxxxxxxx> 23/03/2007 9:39 a.m. >>>
        Hello group,
        
        I would like to know how you are handling this situation.
        
        I would like the ability of adding different constraints on the nets
        that form an xnet.  I was told by Cadence that this ability does not
        exist as of today.    
        
        In one case, prior to xnets being defined, I had a TOTAL_ETCH_LENGTH
        property attached to one leg of a soon to be defined xnet.  The purpose
        of this was to force the placement of a series termination resistor.
        Once the xnet was defined, that same etch length property got propagated
        to the entire xnet causing a DRC.
        
        It appears that the xnet  gets its name from one of the nets that makes
        up the xnet.  I do not know the algorithm in how it chooses to name the
        xnet.  It seems to me what is needed is an xnet name that is unique.
        
        Do you have any suggestions?
        
        
        
        Thanks,
        
        
        
        Chris
        
        
        
        P.S.  here is a snippet from my case with Cadence
        
        "The ability of adding different constraints on the nets that form an
        xnet doesnt exist as of today.  There is an already existing Enhancement
        PCR 811652 Title : apply constraints to net portion of xnet only
        regarding this issue. I will append your SR to this PCR."
        
        
        
        

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