max_area¶

Maximum area of each connected region of a layer — or of each hole through one, of everything of a second layer inside each region of the first, or of the layer on the whole chip, as scope says. The mirror of min_area.

Semantics¶

As min_area, with an area over value reported.

The bound is put on the half grid an area lives on once — a minimum rounded up, a maximum down, an exact value to the nearest half DBU² — and compared exactly. The tiling cuts a shape at grid points on every axis-aligned and 45° wall, so the pieces’ areas sum to the region’s exactly there; a wall at another angle can be off by a fraction of a DBU² where a tile line crosses it.

Layers¶

As min_area.

Parameters¶

scope

Optional. What the area is summed over.

region (the default): Each connected region of the layer, shapes that overlap or abut forming one region and measured together.
hole: Each hole through a region — an empty area the layer surrounds entirely (IHP Act.e, GF180 DF.10: a tiny hole in active is a violation).
contained: Everything of layers[1] inside each region of layers[0], summed per region: “these may share a plate, as long as the total on that one plate stays under the cap” (GF180 MIM.11, where several MIM capacitors may share a bottom plate but their areas add up against MIM.8b’s limit).
chip: Everything of the layer on the chip, summed once (IHP MIM.gR, the recommended total MIM area).

net

Optional, with scope: region. connected narrows the rule to regions on a net that also carries some region of the layer the connected layer param names — the antenna protection diode that must be big enough to protect the gate it is tied to (IHP Ant.g). Nets are looked up on conductors of the connect graph, which a marker layer is not: net_of names the conductor under the measured layer (a diode sits on Activ), connected_net_of the one under the connected layer (a gate on GatPoly); each defaults to the layer itself. A rule with net is net-aware: it runs net extraction and is skipped under --no-connectivity.

Violation markers¶

As min_area.

KLayout equivalent¶

with_area(value, nil) on the regions; area > value on the whole layer for the chip.

Examples¶

- id: MIM.11
  check: max_area
  layers: [mim11_plate, fusetop]
  value: 10000.0
  params:
    scope: contained

- id: MIM.gR
  check: max_area
  layers: [MIM]
  value: 174800.0
  params:
    scope: chip