Loading patent…
AssigneeHitachi, Ltd.
InventorsYutaka Sekiyama, Yasuyuki Fujihara, Terumine Hayashi, Hiromi Tanaka, Jiro Kusuhara
Estimating the term…
In order to determine the routes of wiring connections on a multi-layer circuit board, to form a suitable wiring pattern without local congestions of the wiring connections, the wiring region of the circuit board is considered as one or more areas. For each area, a preferred wiring direction is determined for each layer of the circuit board. Those preferred directions for the layers may be determined by proposing initial preferred wiring directions for each layer, determining whether there is congestion of the wiring connections in any area, and changing the wiring direction for one or more layers of such an area to reduce the congestion. Alternatively, the wiring directions can be determined for each layer without there being an initial wiring direction which is common to all areas. Furthermore, an excess number value may be obtained, which is the sum by which the desired number of wiring connections of an area exceed a predetermined value, for a series of candidate wiring directions of the layers of the area, and then the candidate is selected which has the minimum excess value.
A method of determining routes for a plurality of wiring connections for at least one predetermined area of a circuit board having a plurality of layers by first determining a wiring direction for routing said wiring connections for each area of said circuit board prior to determining a routing pattern for said wiring connections for each of said layers, said method comprising the steps of:
A method of determining routes for a plurality of wiring connections for a plurality of predetermined areas of a circuit board having a plurality of layers by first determining a wiring direction for routing said wiring connections for each area of said circuit board prior to determining a routing pattern for said wiring connections for each of said layers, comprising the steps of:
A method of determining routes for a plurality of wiring connections for at least one predetermined area of a circuit board having a plurality of layers by first determining a wiring direction for routing said wiring connections for each area of said circuit board prior to determining a routing pattern for said wiring connections for each of said layers, comprising:
A method of determining routes for a plurality of wiring connections for a plurality of predetermined areas of a circuit board having a plurality of layers, by first determining a wiring direction for routing said wiring connections for each area of said circuit board prior to determining a routing pattern for said wiring connections for each of said layers, comprising the steps of:
A method of determining routes for a plurality of wiring connections for at least one predetermined area on a circuit board having a plurality of layers by first determining a wiring direction for routing said wiring connections for each area of said circuit board prior to determining a routing pattern for said wiring connections for each of said layers, wherein, for said at least one predetermined area of said circuit board, candidates from preset combinations of wiring directions for areas of said plurality of layers corresponding to the same position of said at least one predetermined area are successively selected, and a wiring direction is determined for each layer on the basis of a degree of congestion of a predicted number of said wiring connections for said at least one predetermined area for said selected candidates of preset combinations of wiring directions, over all said plurality of layers.
A method of determining routes for a plurality of wiring connections on a predetermined area of a circuit board, said circuit board having a plurality of layers by first determining a wiring direction for routing said wiring connections for each area of said circuit board prior to determining a routing pattern for said wiring connections for each of said layers, comprising:
Dependencies are inferred from the claim text.