[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."
        
        
        
        

        NOTICE: This message contains privileged and confidential
        information intended only for the use of the addressee
        named above. If you are not the intended recipient of
        this message you are hereby notified that you must not
        disseminate, copy or take any action in reliance on it.
        If you have received this message in error please
        notify Allied Telesis Labs Ltd immediately.
        Any views expressed in this message are those of the
        individual sender, except where the sender has the
        authority to issue and specifically states them to
        be the views of Allied Telesis Labs.

Other related posts: