12.5. Detailed Routing
Given global-routing paths, detailed routing determines the exact tracks and vias for nets. Here, we discuss the two most popular types of detailed routing: channel routing and full-chip routing.
In earlier process technologies when the maximum number of available metal layers was only two or three, channel routing was pervasively used, because most wires were routed in the free space (i.e., routing channel) between a pair of logic blocks (cell rows); see Figure 12.15. In modern technologies, a chip typically contains six to ten metal layers, and the number of available metal layers is expected to increase steadily in the near future. With more metal layers, routing over the logic block (cell rows) is common (i.e., ...
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