Interactive router modes in PCB Design - Full Explanation

Introduction

Routing printed circuit boards (PCBs) can be tricky because you need to connect many points without crossing wires or causing errors. Interactive router modes help designers guide the path of electrical connections more easily and accurately.

Explanation

Manual Routing Mode

In manual routing mode, the designer controls every step of the wire placement. You click to start a trace and drag it along the desired path, placing corners and bends exactly where you want. This mode gives full control but requires more time and attention.

Manual routing lets you precisely control each wire path but needs careful planning.

Interactive Routing Mode

Interactive routing mode assists the designer by automatically suggesting paths while you guide the trace. It can avoid obstacles and optimize the route in real time, but you still influence the direction and shape. This mode balances control with automation.

Interactive routing helps find efficient paths while letting you steer the trace.

Push and Shove Routing

Push and shove routing allows the trace you are placing to push existing traces out of the way to make room. Instead of manually rerouting other wires, the router moves them automatically to avoid collisions. This speeds up routing in crowded areas.

Push and shove routing automatically adjusts nearby traces to clear a path.

Glossing Mode

Glossing mode cleans up existing routes by smoothing corners and optimizing trace shapes without changing their electrical connections. It improves the appearance and manufacturability of the PCB after routing is mostly done.

Glossing refines and smooths traces to improve PCB quality after routing.

Real World Analogy

Imagine laying out a garden hose in a yard full of obstacles. Manual mode is like carefully placing the hose yourself around trees. Interactive mode is like having a helper suggest the best path as you move the hose. Push and shove mode lets the hose push aside small plants automatically. Glossing mode is like tidying up the hose to make it look neat after placement.

Manual Routing Mode → Placing a garden hose carefully by hand around trees

Interactive Routing Mode → Having a helper suggest the best hose path as you move it

Push and Shove Routing → The hose pushing aside small plants automatically to clear a path

Glossing Mode → Tidying up the hose to make it look neat after placement

Diagram

Diagram

┌───────────────────────────────┐
│        Interactive Router      │
├──────────────┬───────────────┤
│ Manual       │ You control   │
│ Routing      │ every step    │
├──────────────┼───────────────┤
│ Interactive  │ Router helps  │
│ Routing      │ suggest paths │
├──────────────┼───────────────┤
│ Push & Shove │ Moves nearby  │
│ Routing      │ traces aside  │
├──────────────┼───────────────┤
│ Glossing     │ Smooths &     │
│ Mode         │ cleans traces │
└──────────────┴───────────────┘

Diagram showing the four interactive router modes and their main functions.

Key Facts

Manual Routing Mode → Designer places each trace segment manually with full control.

Interactive Routing Mode → Router suggests paths while designer guides trace placement.

Push and Shove Routing → Router automatically moves existing traces to clear a path.

Glossing Mode → Router smooths and cleans trace shapes without changing connections.

Common Confusions

Believing interactive routing fully automates trace placement.

Believing interactive routing fully automates trace placement. Interactive routing assists but still requires the designer to guide and approve paths.

Thinking push and shove routing can move any trace anywhere.

Thinking push and shove routing can move any trace anywhere. Push and shove only moves traces within allowed design rules and space constraints.

Assuming glossing mode changes electrical connections.

Assuming glossing mode changes electrical connections. Glossing only adjusts trace shapes visually; it does not alter electrical paths.

Summary

Interactive router modes help PCB designers place traces efficiently by balancing control and automation.

Manual mode gives full control, while interactive mode suggests paths as you guide the trace.

Push and shove routing moves nearby traces automatically, and glossing cleans up trace shapes after routing.