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The Misc Config Button: Misc. Extraction Settings
The Misc. Extraction Settings panel appears in response to
pressing the Misc Config button in the Edit Menu. The
controls in the panel correspond to general extraction-related
variables. In addition, the full extraction operation can be
initiated or invalidated from the panel. As the extraction state is
automatically controlled by general commands and functions, it is not
likely that this will be needed, but is available for trouble-shooting
or other uses.
The Visual Attributes control group contains controls which
affect terminal display, in both electrical and physical windows.
These are the only controls in the panel which a general user is
likely to need.
- Erase behind physical terminals
This will cause the area under terminals in physical windows to be
erased, to promote visibility. One can choose to not erase, to erase
only under the cell's terminals, or to erase under all terminals.
This tracks the setting of the EraseBehindTerms variable.
- Terminal text pixel size
This sets the text height, in pixels, of the text associated with
terminals in both physical and electrical windows. This tracks the
setting of the TermTextSize variable. The default text height
is 14 pixels.
- Terminal mark size
This sets the pixel size of the mark used to indicate terminal
locations in both physical and electrical windows. It tracks the
value of the TermMarkSize variable. The default mark size is 10
pixels.
The Ground Plane Handling group controls how the extraction
system treats a ground plane. The is only required if the technology
file defines a ground plane layer, which is unlikely to be true in
semiconductor processing. The ground plane handling features were
included specifically for Josephson junction process support, but can
be applied to other technologies should the need arise.
- Assume clear-field ground plane is global
If a clear-field ground plane has been identified in the technology
file, when this box is checked, all areas of this layer are assigned
group 0, the ground group. When not checked, only the largest area
group in the top-level cell is assigned group 0. This tracks the <a
GroundPlaneGlobal variable.
- Invert dark-field ground plane for multi-nets
If a dark-field fround plane layer has been identified in the
technology file, if this box is checked, the ground plane layer will
be polarity inverted internally for extraction purposes. The inverted
layer will be used to establish connectivity. This tracks the state
of the GroundPlaneMulti variable.
- Inversion method menu
When using an inverted gound plane, this menu provides a choice of
methods. The default is to invert in each cell, then clip out the
area occupied by subcells. The second choice will create the inverted
layer in the top-level cell only, using the entire hierarchy as the
source for geometry to invert. The third choice is similar, but will
create the inverted layer in each cell, using as the source all
geometry in that cell and its subcell hierarchy. This tracks the
state of the GroundPlaneMethod variable.
The remaining check boxes control obscure flags most likely only
needed for debugging.
- Skip device parameter measurement
When this box is checked, device parameter measurement will not be
performed during extraction. This may save time if the user is
interested only in topology. This tracks the state of the NoMeasure variable.
- Skip device terminal permutations in association
When checked, terminal permutations are not attempted when associating
physical and electrical devices. This is mostly for debugging. This
tracks the NoPermute variable.
- Extract opaque cells, ignore OPAQUE flag
Checking this will cause the extraction system to ignore the OPAQUE
flag applied to subcells, and attempt to extract the contents as for a
normal cell. This tracks the state of the ExtractOpaque
variable.
Finally, there are two buttons which will invalidate or initiate
extraction.
- Clear Extraction
Pressing this button will clear the internal structurs and flags
associated with extraction. This is normally done automatically if
the layout changes, or a setup variable is changed.
- Do Extraction
Pressing this button will perform the full extraction and association.
This is normally done automatically when needed within commands.
Next: The Edit Tech Params
Up: The Extract Menu: Extraction
Previous: The RLC Extraction Panel
Contents
Index
Stephen R. Whiteley
2012-04-01