摘要:
A method for routing of some embodiments defines global routes for nets in an arbitrary region of a circuit layout in which each net has a set of pins. The method uses a first set of lines of measure the length of the global routes, a second set of lines to measure congestion of the global routes, and a third set of lines to partition the arbitrary region into a first set of sub-regions. For each net, the method identifies a global route that connects a group of first-set sub-regions that contain the net's set of pins.
摘要:
Some embodiments of the invention provide a method of for routing nets within a region of an integrated circuit (“IC”) layout. The method selects a net in the IC layout region. It then identifies a topological route for the selected net. From the selected net's topological route, this method then generates a geometric route for the selected net.
摘要:
Some embodiments of the invention provide a method of routing nets in a region of a design layout. The region contains a plurality of nets and has multiple interconnect layers. The method identifies routes for a set of nets in the region, where some of the routes utilize vias to traverse multiple interconnect layers. The method then moves at least one via to improve the routing.
摘要:
Some embodiments of the invention provide a region of an integrated-circuit (“IC”) layout that has a plurality of interconnect layers, where at least one particular layer has more than one preferred interconnect direction. In some of these embodiments, the region has several interconnect layers that have more than one preferred wiring direction each.
摘要:
Some embodiments of the invention provide a method of routing nets in a region of an integrated-circuit (“IC”) layout. The method selects a net that has several routable elements. It then defines a route for the net. To define the route, the method uses a wiring model that specifies preferred non-Manhattan wiring directions. It also uses a manufacturing grid as the only grid for constraining the location of interconnect lines for connecting the net's routable elements.
摘要:
Some embodiments of the invention provide an integrated-circuit chip that has a design based on a wiring model that allows at least a particular wiring layer to have more than one preferred wiring directions. Other embodiments provide a method of manufacturing an integrated circuit (“IC”) that has a plurality of wiring layers. The method specifies a layout of the IC by using a wiring model that specifies more than one preferred wiring direction for at least a region of a particular wiring layer. The method then uses the layout to fabricate the integrated circuit.
摘要:
Some embodiments of the invention provide a method of routing nets in a region of a layout with multiple layers. The method defines a routing graph that has several of nodes on plurality of layers, where each node represents a sub-region on a layer. In the graph, there is a set of edges between the nodes on each layer. On one layer, there is at least one set of edges that are neither orthogonal nor parallel to a set of edges on another layer. The method uses this routing graph to identify routes.
摘要:
Some embodiments of the invention provide a method of defining a global route for a net in a region of a layout, where each net has a set of routable elements. The method partitions the region into several rectangular sub-regions. It then identifies a set of sub-regions that contain the routable elements of the net. Next, it defines a global route that connects the identified sub-regions, where the global route includes at least one non-Manhattan edge that crosses a boundary between two sub-regions at a non-vertex location.
摘要:
Some embodiments of the invention provide a method of searching for a path. The method identifies a set of source and target elements. It then performs a path search that iteratively identifying path expansions in order to identify a set of associated path expansions that connect the source and target elements. The method costs at least one expansion based on an exponential equation that has an exponent that includes a cost associated with the expansion.
摘要:
Some embodiments of the invention provide a method for generating a route for a net in an integrated circuit (“IC”) layout. The method receives a previously defined route. From the received route, it generates several constraining points for specifying a geometric route that is based on a particular wiring model. The method then uses the constraining points to generate a geometric route that traverses diagonal and Manhattan directions.