How to change via level with skill in IC6

Thanks Andrew!    It works like a charm now.

-Kathy =)

Hi Andrew,

  Is there anyway to change the existing via rows or column, by using viadefs parameter

No. You can't do that (it doesn't make sense either).

You can change the rows and columns of an existing via instance by using:

viaInst~>cutRows=4
viaInst~>cutColumns=6

or you could use dbReplaceProp() or dbReplacePropList() to change them in one go.

You'll find that you'll get a different viaHeader if you do this - it will bind that via to a different header.

Andrew.

Thanks Andrew,I will try this.

can you tell me what is difference between the objects and instances.

Not sure I entirely understand the question, because it's like asking for the difference between fruit and apples.

In both CDB and OpenAccess, various things are represented as "objects" in the database. For example, there are objects to represent shapes (e.g. rectangles, polygons, paths, ellipses etc), objects to represent instances, objects to represent nets, terminals, and so on and so on. Instances are a type of object. In CDB there was no specific object type for vias; vias were just instances. In OpenAccess however, instances are one type of object, and vias are another type - so there is now a specific object type for vias, thus separating them from ordinary instances (e.g. instances of devices, instances of other cellViews and so on).

Hopefully that answers your question?

Andrew.

Thanks Andrew its working ..

Please tell me the such similar command to change the via pitch, in one shot

Andrew Beckett said:

No. You can't do that (it doesn't make sense either).

You can change the rows and columns of an existing via instance by using:

viaInst~>cutRows=4
viaInst~>cutColumns=6

or you could use dbReplaceProp() or dbReplacePropList() to change them in one go.

You'll find that you'll get a different viaHeader if you do this - it will bind that via to a different header.

Andrew.

--Thanks & Regards

 Guru

 Thanks  Andrew,for your nice ans  :-)

Guru,

You can find this information out yourself very easily. Place a via, and change the properties to what you want. For example, I altered the via width and length, and spacings. Then I did:

car(getGetSelSet())~>viaHeader~>overrideParams

and I get:

(("cutWidth" 0.16)
    ("cutHeight" 0.17)
    ("cutRows" 3)
    ("cutColumns" 2)
    ("cutSpacing"
    (0.3 0.2)
    )
)

From this I can see that the spacing is controlled by cutSpacing, and similarly for the width and length (there's no "pitch", but obviously that's the width plus the horizontal spacing).

Then I can do

viaInst~>cutSpacing=list(0.6 0.4)
viaInst~>cutWidth=0.25

or whatever. You can use the same approach to find out the parameter names - try changing it interactively, then query the database to find out the names used.

Regards,

Andrew.

Dear Andrew,

I am using your methododlogy to convert cdb instance vias to oa stdVias with dbCreateVia.

The issue is that my pcells having conditional inclusions of vias do not work any longer. I must recreate them.

Is there an easy way to update the pcell information with the new via objects?

Regards,

 Antonios

 Antonios,

I don't really understand your question.

Andrew