Design Verification Layer
A Design Verification layer, or “layer”, is
a collection of geometry. A layer is a term used internally within DV
as input or output for various DV commands. When used as input, the
contents of a DV layer can be imported from layout by the ImportLayer
command or created by a DV command. When used as output, the SaveLayer
command can be used to save the contents of a DV layer as results which
can then be viewed in layout.
DV layers contain one of the following types of graphical
information:
- Error clusters – Grouped segments that represent
the results of a check. Usually a cluster contains two segments, but
under certain conditions there may be a fewer or greater number of segments.
These segments possess no polygon information. Segments may be a single
point.
- Polygons – Closed geometric figures which may
contain holes.
DV layers containing polygons may be used as input
to any command. Once DV layers containing edges are supported, they
may be used as input to commands. DV layers containing polygons or edges
support rule “conjunction”, using the output of one check/operation as
the input to another check/operation. DV layers containing error clusters
may be used as input only with the SaveLayer command.
