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How to define double vias in rules file for VCAR

PSRK over 14 years ago

Hi,

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.

Thanks,

Siva

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craigth over 14 years ago
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.
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craigth over 14 years ago
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.
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