|D||External diameter of via (external diameter of via cylinder)||Length||L|
|T||Thickness of metal (thickness of via cylinder wall)||Length||T|
|RHO||Metal bulk resistivity normalized to gold||Rho|
|*SNAME||Via drawing definition||Default|
* indicates a secondary parameter
Parameters are the same as the VIA element.
Discontinuity models function most accurately when attached to lines that match their corresponding edges. Directly connecting discontinuity models to one another reduces their accuracy.
VIA models draw according to the SNAME parameter setting on the via, as configured in the LPF. If this parameter is left blank the via definition in the LPF is used to define the via layers. See “Via Definitions” for details. This typically works well if there is only one via type in the design. If you need to have different via layers, the best approach is to create structures in the LPF for each type, then set the SNAME parameter to match the structure name in the LPF. See “Structure Type Definitions” for more information.