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ORAssistant_RAG_Dataset
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# 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.

```tcl
density_fill
    [-rules rules_file]
    [-area {lx ly ux uy}]
```

#### Options

| Switch Name | Description | 
| ----- | ----- |
| `-rules` | Specify `json` rule file. |
| `-area` | 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](https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/blob/master/flow/platforms/sky130hd/fill.json).

The schema for the `json` is:

```json
{
  "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](../../README.md#regression-tests). 

Simply run the following script: 

```shell
./test/regression
```

## Limitations

## FAQs

Check out [GitHub discussion](https://github.com/The-OpenROAD-Project/OpenROAD/discussions/categories/q-a?discussions_q=category%3AQ%26A+metal%20fill+in%3Atitle)
about this tool.

## License

BSD 3-Clause License. See [LICENSE](LICENSE) file.