Routing

smc1017 · 发表于 2023-5-19 19:57:22

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Routing is an important step in the design of integrated circuits. It involves generating metal wires to connect the pins of same signal while obeying manufacturing design rules. Before routing is performed on the design, cell placement has to be carried out where in the c ells used in the design are placed. But the connections between the pins of the cells pertaining to same signal need to be made. At the time of placement, there are only logical connections between these pins. The physical connections are made by routing. More generally speaking, routing is to locate a set of wires in routing space so as to connect all the nets in the netlist taking into consideration routing channels' capacities, wire widths and crossings etc. The objective of routing is to minimize total wire length and number of vias and that each net meets its timing budget. The tools that perform routing are termed as routers . You typically provide them with a placed netlist along with list of timing critical nets. These tools, in turn, provide you with the geometry of all the nets in the design.