max_density¶

The combined density of one or more layers, over the whole chip, must be at most value (%).

Semantics¶

The dual of min_density, sharing the same denominator logic: the listed layers’ merged coverage is summed and divided by the chip’s bounding box (or, with boundary_layer set, that layer’s bounding box — not its own drawn area, for the same hollow-seal-ring reason described in min_density).

Together, a min_density/max_density pair on the same layers forms the usual “keep fill density within [floor, ceiling]” rule pair.

Layers¶

One or more layers; their merged areas are summed for the numerator.

Parameters¶

boundary_layer: GDS layer number for the density denominator’s bounding box. Optional — if omitted (or the layer has no shapes), the bounding box of every shape in the design is used instead.
boundary_datatype: GDS datatype paired with boundary_layer. Optional, defaults to 0.

Violation markers¶

One chip-wide (global, no coordinates) marker if the computed density exceeds value.

KLayout equivalent¶

layer.without_density(value, nil, tile_boundary) — a single-tile (whole-chip) density check, with the tile boundary set from the seal-ring layer rather than the raw layout bounding box.

Example¶

- id: TM2.d
  check: max_density
  layers: [TopMetal2, TopMetal2.filler, TopMetal2.mask]
  value: 70.00
  params:
    boundary_layer: 39