max_space

Maximum proximity-coverage distance: every part of a target layer must lie within value of a reference layer. Used for latch-up rules such as “every source/drain diffusion must be within 20 µm of a well tie.”

Semantics

This is a coverage/reach check, not a spacing check: it doesn’t flag two regions that are too close, it flags parts of layers[0] that are too far from any region of layers[1]. Both layers are tiled (never globally unioned, so a dense reference layer like Cont stays memory-bounded); for each gap found between the target and its nearest reference geometry, a point is reported wherever that gap exceeds value.

Layers

• layers[0] — the target that must stay close to something.

• layers[1] — the reference geometry it must reach.

Parameters

None beyond layers and value (µm, the maximum allowed distance to the nearest reference region).

Violation markers

One point marker per proximity gap found, at the far point of layers[0] that exceeds value from the nearest layers[1] region.

KLayout equivalent

Not a single built-in operator — conceptually the inverse of Region#separation: KLayout decks typically express this as target.not_interacting(reference.sized(value)) or an equivalent “shrink the reach and see what falls outside it” construction.

Example

- id: LU.a
  check: max_space
  layers: [PsdActivInNWell, NActivInNWell]
  value: 20.00