How to define double vias in rules file for VCAR

Siva,

• use_via http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccraft/iccraft6.1.5/cmd_circuit/use_via_descriptor.htm 
• use_array
•  enforce_use_array_rule http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccraft/iccraft6.1.5/cmd_sw/enforce_use_array_rule_key_set.htm

•  Via Arrays and Via Images       http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccausr/iccausr6.1.5/chap7.html#98914 
• Choosing to use Via Arrays or Via Images       http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccausr/iccausr6.1.5/chap7.html#829052  
• Via Adjacency Rules for Via Arrays      http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccausr/iccausr6.1.5/chap7.html#828997

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

• OpenAccess  http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccraft/iccraft6.1.5/toc/iccraftTOC5.html 
• Mapping Constraints to Virtuoso Chip Assembly Router  http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccraft/iccraft6.1.5/oa/mapping_constraints_to_vcar.htm 

Siva,

 Sorry about the formatting. Below is a reformatted version of my response.

Siva,

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.

• use_via http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccraft/iccraft6.1.5/cmd_circuit/use_via_descriptor.htm 
• use_array
• enforce_use_array_rule http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccraft/iccraft6.1.5/cmd_sw/enforce_use_array_rule_key_set.htm

You can also reference some good information in the IC615 Virtuoso Chip Assembly User Guide  

•  Via Arrays and Via Images       http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccausr/iccausr6.1.5/chap7.html#98914 
• Choosing to use Via Arrays or Via Images       http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccausr/iccausr6.1.5/chap7.html#829052  
• Via Adjacency Rules for Via Arrays      http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccausr/iccausr6.1.5/chap7.html#828997

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

• OpenAccess  http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccraft/iccraft6.1.5/toc/iccraftTOC5.html 
• Mapping Constraints to Virtuoso Chip Assembly Router  http://support.cadence.com/wps/PA_DocumentViewer/pubs/iccraft/iccraft6.1.5/oa/mapping_constraints_to_vcar.htm 

            oaViaDefArrayValue      use_via class rule (from nondefault routing constraint)  

Regards,   

Craig T.

 HI Craig...

 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.

 Thanks,

Siva

 Hi Craig,

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 25
clean 2
route 50 16
clean 4

I was wrong with the rules file. Thanks for your response.

Thanks,

Siva

Peter,

I don't see your attachment. Did you attach it properly?

Thanks,
Siva

Attached is my export to router form. click on the exporttoroute.png image.

Thanks,
Siva

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.

Andrew

 Hi Siva,

 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.

 Thanks,

-peter-

 Hi Andrew,

Since there is no rules file in OA database,what should i do in order to use the command "use_via"?

Thanks,

-Peter-