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Global Routing in Physical Design

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routing is done after the design has been placed and trial routed

trial routing is routing the design in temporary way assigning the possible way for doing the final routing

Global routing is making real connections using different metal layers and the final routing also.....

The routing problem is typically solved using a two step approach:
Global Routing
• Define the routing regions.
• Generate a tentative route for each net.
• Each net is assigned to a set of routing regions.
• Does not specify the actual layout of wires.

Detailed Routing
• For each routing region, each net passing through that
region is assigned particular routing tracks.
• Actual layout of wires gets fixed.
• Associated subproblems: channel routing and
switchbox routing.

**broken link removed**
Actually the layout area is divided on bins and the tool then calculates the no of tracks crossing the bin for congestion analysis and if the routing channels demanded < channels available , then we say the region is congested.

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