Guides / Reference

Stackup & impedance targets

The stackup is the board’s cross-section: how many copper layers, what’s between them, and what impedances the geometry should hit.

The Board Stackup sheet: physical construction 2 copper 1.58mm, layer presets 2L to 8L SDR, a ghost cross-section comparing current and preview, and ordered construction rows
The Board Stackup sheet. Presets are fabrication starting points; the ghost cross-section shows the current stack in grey against the exact stack Apply will build in cyan.
  1. Set the copper count

    Layers ▸ the copper-count row ▸ 2, 4, 6 or 8. Inner layers appear in the list as they’re created.

  2. Declare targets

    In the stackup editor, set 50 Ω single-ended and 90/100 Ω differential targets. Nets under a differential target get pair routing; the route-time readout reports against the target you declared.

On desktop tools the usual workflow is an impedance calculator whose result you transcribe by hand. Declaring the target here lets the app apply it to every trace that needs it.