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global routing and detail routing

Posted: Sat May 10, 2014 1:31 pm
by Vijay
Routing is done in two steps, global routing & detail routing. What is the difference between global routing & detail routing?

Re: global routing and detail routing

Posted: Sat May 10, 2014 6:57 pm
by Narveer
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.

http://cc.ee.ntu.edu.tw/~ywchang/Course ... outing.pdf
http://www.facweb.iitkgp.ernet.in/~isg/ ... outing.pdf