Metal fill#
This module inserts floating metal fill shapes to meet metal density
design rules while obeying DRC constraints. It is driven by a json
configuration file.
Commands#
Note
Parameters in square brackets
[-param param]
are optional.Parameters without square brackets
-param2 param2
are required.
Density Fill#
This command performs density fill to meet metal density DRC rules.
density_fill
[-rules rules_file]
[-area {lx ly ux uy}]
Options#
Switch Name |
Description |
---|---|
|
Specify |
|
Optional. If not specified, the core area will be used. |
Example scripts#
The rules json
file controls fill and you can see an example
here.
The schema for the json
is:
{
"layers": {
"<group_name>": {
"layers": "<list of integer gds layers>",
"names": "<list of name strings>",
"opc": {
"datatype": "<list of integer gds datatypes>",
"width": "<list of widths in microns>",
"height": "<list of heightsin microns>",
"space_to_fill": "<real: spacing between fills in microns>",
"space_to_non_fill": "<real: spacing to non-fill shapes in microns>",
"space_line_end": "<real: spacing to end of line in microns>"
},
"non-opc": {
"datatype": "<list of integer gds datatypes>",
"width": "<list of widths in microns>",
"height": "<list of heightsin microns>",
"space_to_fill": "<real: spacing between fills in microns>",
"space_to_non_fill": "<real: spacing to non-fill shapes in microns>"
}
}, ...
}
}
The opc
section is optional depending on your process.
The width/height lists are effectively parallel arrays of shapes to try in left to right order (generally larger to smaller).
The layer grouping is for convenience. For example in some technologies many
layers have similar rules so it is convenient to have a Mx
, Cx
group.
This all started out in klayout
so there are some obsolete fields that the
parser accepts but ignores (e.g., space_to_outline
).
Regression tests#
There are a set of regression tests in ./test
. For more information, refer to this section.
Simply run the following script:
./test/regression
Limitations#
FAQs#
Check out GitHub discussion about this tool.
License#
BSD 3-Clause License. See LICENSE file.