incremental techDB and constraintGroups

Hi *,

I'm trying to use the ITDB feature in Virtuoso 6.1.6 .

In a few word what I want:

I a base technology db, with some layers/vias, etc..

I want to reference that library and to add a new layer LXX, and to create a new via "cnt_LXX" using (Metal1, Contact, LXX).

The Metal1 and Contact are already defined in the base techdb.

I would like to have the the new cnt_LXX in the same constraint group "virtuosoDefaultSetup" which the activative one by default.

The idea is that when the layouter press "O" (Create->Via...) to have the list of vias all the initial vias plus the new created.

The problem is that in the new teck library I'm not allowed to use the same constraint group name "virtusosDefaultSetup".

When loading the new tech file (ASCII) I get error message

_____________

*WARNING* (TECH-2000000): techCreateConstraintGroup: Constraint group with name virtuosoDefaultSetup already exists.
*WARNING* (TECH-280190): Failed to create constraintGroup virtuosoDefaultSetup.
*WARNING* (TECH-280257): Failed to load technology file from file '..."

_______________

I can change teh name of the group to something like "virtuosoDefaultSetup_LXX" and then to switch the wire Constraint group via Options->Editor, but it is not nice (not productive for designers).

So the question is how can I have the old vias and new via in a common list/constraint which is loaded/set by default?

I have to admit I'm not very familiar with the tech file, but I've read some documents availale on virtuoso install path.

Below is a piece of code from tech file, teh layer definition and few other details were skip.

Best Regards,

Marcel

__________

refTechLibs( "my_baseTech")

;********************************
; VIADEFS
;********************************
viaDefs(

 standardViaDefs(
 ;( viaDefName    layer1    layer2    (cutLayer cutWidth cutHeight [resistancePerCut])
 ;   (cutRows    cutCol    (cutSpace))
 ;   (layer1Enc) (layer2Enc)    (layer1Offset)    (layer2Offset)    (origOffset)
 ;   [implant1     (implant1Enc)    [implant2    (implant2Enc) [well/substrate]]])
 ;( -------------------------------------------------------------------------- )

  ( cnt_LXX          LXX          Metal1          ("Contact" 0.17 0.17)        
     (1 1 (0.34 0.34))                                    
     (0.13 0.13)    (0.08 0.08)    (0.0 0.0)    (0.0 0.0)    (0.0 0.0)    
  )                                            
 ) ;standardViaDefs

) ;viaDefs

;********************************
; CONSTRAINT GROUPS
;********************************
constraintGroups(
  ( "virtuosoDefaultSetup" nil
    interconnect(
     ( validLayers   ( LXX
       ) )
     ( validVias     (
        cnt_LXX
     ) )
    ) ;interconnect
  )
 
 

  ( "DoubleVia" nil

    interconnect(
     ( validLayers   ( LXX
       ) )
     ( validVias     (
       cnt_LXX
       ) )
    ) ;interconnect

    )

  ( "virtuosoDefaultExtractorSetup"    nil

    interconnect(
     ( validLayers   (  
        LXX
    )) ;interconnect
    )
  ) ;virtuosoDefaultExtractorSetup


  ( "foundry"    nil


    orderedSpacings(
     ( minOppExtension               "LXXC_Mark"    "Contact"    (0.46 0.46) )
    ) ;orderedSpacings
) ;; foundry    

) ;constraintGroups