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I'm using the below constraint in the vcar rules file before exporting. The VCAR is placing single via while routing.
list( '("tsmc18rf" "M2_M1" "symbolic") t)
But I dont know the rule to keep double contact/via in the router .Please help me.
If you mean the oa techFile and/or constraint definition as the “vcar rules file” you should reference the following sections in the Virtuoso Chip Assembly User Reference Manual
Craig Thompson Sr. Technical Leader Technical Field Operations, North America-Central Region 866.225.3138
Sorry about the formatting. Below is a reformatted version of my response.
What release of Virtuoso and VCAR are you using?
What do you mean by “vcar rules file”? Do you mean the .do file?
In parallel to a response to the questions above, reference the following VCAR commands in the IC615 Virtuoso Chip Assembly User Reference Manual. These commands allow you to specify and control multiple vias during routing.
You can also reference some good information in the IC615 Virtuoso Chip Assembly User Guide
oaViaDefArrayValue use_via class rule (from nondefault routing constraint)
In reply to Craig Thompson:
I didn't mean the do file. We do specify a rules file in "export to router" window. I check the box "Use rules file" and the rules file in which I define the Minimum widths minimum spacings and the vias to be used. For example, I have attached the rules file. please look into it.
In reply to PSRK:
I referred to the use_via and use_array commands from the links that you have posted. My issue is solved now. I added these lines to my do file.
select all nets
define (group group1 (selected))
circuit group group1 (use_via (use_array M2_M1 1 2))
##Standard Routing Command
route 50 16
I was wrong with the rules file. Thanks for your response.
In reply to Peter123:
I don't see your attachment. Did you attach it properly?
Attached is my export to router form. click on the exporttoroute.png image.
In IC615, because it is working directly on the OA database, it will use the technology rules directly from OA - and hence there's no option to specify a rules file. The thing that Siva was describing before is implemented with a "do" file, and you still have the ability to specify one of those.
For some reason, i can't upload my snapshot.
Your form is like IC5.1.X version, which i used to have.
But, I'm in IC6.1.5 now; the form looks totally diff.
In reply to Andrew Beckett:
Since there is no rules file in OA database,what should i do in order to use the command "use_via"?
You don't Have to worry about the rules file. Anyways, you can still use the commands in my earlier comments in your do file. or you can just type in the commands in the autorouter console before you execute route command.
You can attach the files in here if you click the "options" botton next to the compose botton
What you should be able to do is define inside virtuoso which vias you wish to use by creating a constraint group and defining the allowable vias. That can be done in the constraint manager in VLS-XL.
If anything is unclear though, the best thing to do is to go to customer support.