techGetViaLayers

techGetViaLayers(
d_techID
) 
=> l_viaLayers / nil

Returns a list of the sets of layers used in the standard via definitions defined in the specified technology database.

d_techID

The database identifier of the technology database.

l_viaLayers

The list of sets of layers used in standard via definitions. The list has the following syntax:

( ( lt_bottom lt_via lt_top ) … )

where,

lt_bottom is the bottom routing layer of a set of layers used in standard vias.
lt_via is the middle layer of a set of layers used in standard vias, commonly called the via layer.
lt_top is the top routing layer of a set of layers used in standard vias.

nil

The technology database does not exist or does contain any standard via definitions.

techGetViaLayers(tfID) 
=> (
("metal1" "via" "metal2")
("metal2" "via2" "poly")
)

Lists the sets of layers used in standard via definitions in the technology database identified by tfID.