Method and system for performing placement on non Manhattan semiconductor integrated circuits
First Claim
1. A method of designing an integrated circuit (“
- IC”
) layout, said method comprising;
processing the IC layout with a Manhattan based placement program to produce an initial placement of the IC layout;
processing said initial placement with a non Manhattan based post processor to produce a non Manhattan based placement of the IC layout, wherein the processing of the initial placement is performed before a non Manhattan based routing; and
performing the non Manhattan based routing after processing the initial placement with the non Manhattan based post processor, wherein the non Manhattan based routing defines routes for a plurality of nets of the IC layout that did not have defined routes after the processing by the non Manhattan based post processor of the initial placement.
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Abstract
The present invention introduces methods of creating floor plans and placements for non Manhattan integrated circuits with existing electronic design automation tools. To create a floor plan, an existing Manhattan based floor planning tool is used. The die size for the floor plan is reduced to take into account the improved wiring density of non Manhattan wiring. A non Manhattan global router is then used on the floor plan to create pin placements. The floor plan may create a floor plan having circuit modules with beveled corners to take advantage of diagonal wiring. To create a placement, an existing Manhattan based placer is first used to create an initial placement. The initial placement is then processed by a non Manhattan aware post processor. The post processor performs local optimizations on the initial placement to improve the placement for a non Manhattan routed integrated circuit.
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Citations
18 Claims
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1. A method of designing an integrated circuit (“
- IC”
) layout, said method comprising;processing the IC layout with a Manhattan based placement program to produce an initial placement of the IC layout; processing said initial placement with a non Manhattan based post processor to produce a non Manhattan based placement of the IC layout, wherein the processing of the initial placement is performed before a non Manhattan based routing; and performing the non Manhattan based routing after processing the initial placement with the non Manhattan based post processor, wherein the non Manhattan based routing defines routes for a plurality of nets of the IC layout that did not have defined routes after the processing by the non Manhattan based post processor of the initial placement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- IC”
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10. A computer readable medium, said computer readable medium comprising a set of computer instructions for an integrated circuit (“
- IC”
) layout, said computer instructions implementing the steps of;processing the IC layout with a Manhattan based placement program to produce an initial placement of the IC layout; processing said initial placement with a non Manhattan based post processor to produce a non Manhattan based placement of the IC layout, wherein the processing of the initial placement is performed before a non Manhattan based routing; and performing the non Manhattan based routing after processing the initial placement with the non Manhattan based post processor, wherein the non Manhattan based routing defines routes for a plurality of nets of the IC layout that did not have defined routes after the processing by the non Manhattan based post processor of the initial placement. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- IC”
Specification