Routing path finding method for automated routing/designing process and computer-readable storage medium having stored thereon routing path finding program
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United States of America Patent
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Aug 19, 2003
Grant Date -
N/A
app pub date -
Jul 26, 2000
filing date -
Aug 3, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an automatic routing/designing process of an LSI using a maze algorithm, multiple sub-regions, formed by getting a grid column partitioned by a component placed in a routing region, are extracted. And grid point availability, representing the number of grid points available for routing, is obtained for each of these sub-regions. Also, if there is any open net, then the component is vertically moved upward by one grid unit, for example, to make the net routable. If the grid point availability of a sub-region, used for routing another net, has become negative as a result of the movement of the component, then the net is rerouted to pass other sub-regions. Accordingly, even if a height constraint, for example, has been imposed on the routing region, all of the nets can be routed successfully with the constraint satisfied without increasing the number of grid points in the column direction. As a result, the number of open nets can be minimized and all of the nets are much more likely to be routed successfully.
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