This value can be set to a string, which will be included in the
argument list when FastHenry is initiated with the Run
FastHenry button in the LR Extraction panel Run
page. The variable is most conveniently manipulated with the text
entry field in the LR Extraction panel Run page.
If this variable is set, then the Run FastHenry button in the
LR Extraction panel Run page will initiate a FastHenry run in the foreground. If not set, jobs are run in the
background, so that the user can continue using Xic while the run
is in progress.
It is not clear why there would be any reason to run in the
foreground, except possibly for debugging.
This variable controls, and is controlled by, the setting of the Run in foreground check box in the Run page of the LR
Extraction panel from the Extract Menu.
This variable can be used to specify the evaluation frequencies used
for FastHenry, as included in a generated input file, or when
initiating a run. The format is the same as is used in the FastHenry input format:
The frequencies are floating point numbers given in hertz, and the
ndec parameter, if given, specifies the number of intermediate
frequencies to evaluate. If the third field is not set, evaluation is
at the start and stop frequencies only, or at the single frequency if
both are the same. If the variable is not set, the evaluation is at a
single frequency of one kilohertz. This variable is most conveniently
manipulated with the text entry fields in the LR Extraction
panel Run page.
The inductance/resistance extraction interface uses a special layer
for masking of objects to be included in the extraction run. By
default, this layer is named ``FHRY''. If any shapes exist on
this layer in the current cell hierarchy, all objects will be clipped
by these shapes before inductance/resistance extraction. If no shapes
are found on this layer, then all objects in the current cell
hierarchy will be included in extraction.
If this variable is set to the name of an existing layer name in the
layer table, that layer will do the clipping.
Value: real number 1e2-1e5.
When a non-Manhattan polygon is ``Manhattanized'' for FastHenry,
it is converted to an approximating Manhattan polygon. This variable
can be used to set the minimum rectangle width and height used in the
decomposition. This value is given by
If not set, a value of 1000 is used. Larger values are more accurate
but slow processing, sometimes dramatically. The area_of_interest is the layout area being processed for input to
This variable is most conveniently manipulated with the text input
field in the LR Extraction panel Params page.
If the variable is set, then the standard output from the running FastHenry program is printed in the console, in addition to being
saved in a file. The console is the shell window from which Xic
was started. This allows the user to monitor the run, and abort if
something isn't correct.
This will also apply if the program is being run in the foreground,
however operation is a bit different. In this case, a ``| tee''
is added to the command string ahead of the output file name. There
are two implications: the text will be block buffered, and therefor
won't appear in the window immediately, and in Windows, there is no
native tee command so that the operation may fail. However, a
tee command is provided with the Cygwin tools, and there are
other sources. In the normal case of running in the background,
output will again be block buffered under Windows, but there is no
requirement for a tee command.
This variable mirrors the state of the Out to console check box
in the Run page of the LR Extraction panel from the
Value: directory path string.
This variable can be set to a full path to the FastHenry executable.
If this is not set, Xic will attempt to use ``/usr/local/bin/fasthenry'' as the FastHenry program (or ``/usr/local/bin/fasthenry.exe'' in Windows). If this executable does
not exist, Xic will attempt to find ``fasthenry'' (or ``fasthenry.exe'' in Windows) in the shell search path when running in
the foreground, and background runs will fail.
This tracks the setting of the text entry field in the Run page
of the LR Extraction panel.
Value: units string.
This variable can be used to specify the length units used in
generated FastHenry input files. The variable can be set to a
string consisting of one or the abbreviations ``m'' (meters),
``cm'' (centimeters), ``mm'' (millimeters), ``um''
(microns), ``in'' (inches), and ``mils''. The long form
word will also be accepted. This variable is most conveniently
manipulated with the choice menu found in the LR Extraction
panel Params page.
Value: real number 1e2 - 1e5, default 1e3.
This controls refinement for FastHenry. The total volume of all
conductors is divided by this value, and the cube root taken to
provide a length. Volume elements are split so that no edge is longer
than this length. The total number of volume elements is
approximately the value of this variable. Each volume element
contains six segments, connecting the center node to each face node.