IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0037223
(2001-11-09)
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발명자
/ 주소 |
- Schubring, Gary L.
- Moring, Allen Dale
- Byrne, Darren Shuan
- Murphy, Edward D.
|
출원인 / 주소 |
|
대리인 / 주소 |
Harness, Dickey & Pierce, P.L.C.
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인용정보 |
피인용 횟수 :
16 인용 특허 :
8 |
초록
▼
The preferred embodiment of a double ended fastening system includes a first segment for engaging a component and a second threaded segment for engaging a nut. In another aspect of the present invention, the component has a stud receiving portion made of a polymer or soft metal. A further aspect of
The preferred embodiment of a double ended fastening system includes a first segment for engaging a component and a second threaded segment for engaging a nut. In another aspect of the present invention, the component has a stud receiving portion made of a polymer or soft metal. A further aspect of the present invention provides a self-drilling and self-tapping feature on the stud.
대표청구항
▼
The preferred embodiment of a double ended fastening system includes a first segment for engaging a component and a second threaded segment for engaging a nut. In another aspect of the present invention, the component has a stud receiving portion made of a polymer or soft metal. A further aspect of
The preferred embodiment of a double ended fastening system includes a first segment for engaging a component and a second threaded segment for engaging a nut. In another aspect of the present invention, the component has a stud receiving portion made of a polymer or soft metal. A further aspect of the present invention provides a self-drilling and self-tapping feature on the stud. or the first path; (b) calculating a technology-independent delay for the first path; and (c) dividing the technology-mapped delay by the technology-independent delay. 15. The method as recited in claim 14, wherein the step of calculating the technology-independent delay includes choosing an apparent critical path corresponding to the technology-mapped critical path. 16. The method as recited in claim 14, wherein the step of applying the scale factor includes multiplying at least one delay in the technology-independent circuit by the scale factor to produce at least one scaled delay. 17. The method as recited in claim 16, wherein the step of producing the technology-independent circuit includes choosing representative functions such that every function in the technology-mapped circuit can be represented in the technology-independent circuit, and unmapping the technology-mapped circuit. 18. The method as recited in claim 17, wherein the representative functions are included in a set selected from the group consisting of {NAND,INV}, {NOR, INV}, {AND, INV}, {OR, INV}, and {NOR, NAND, INV}. 19. The method as recited in claim 18, wherein the representative functions are chosen from a technology library, and further comprising the step of determining at least one characterized delay from the technology library for at least one of the representative functions. 20. The method as recited in claim 19, wherein the step of calculating the technology-independent delay includes using the at least one characterized delay. 21. The method as recited in claim 20, wherein the step of producing the technology-independent circuit includes the step of extracting a critical section from the circuit before unmapping the circuit. 22. The method as recited in claim 16, wherein the step of restructuring includes the step of identifying a technology-independent critical path using the at least one scaled delay. 23. The method as recited in claim 22, further comprising the step of checking the restructured circuit against design constraints. 24. The method as recited in claim 23, wherein the steps of producing the technology-mapped circuit, identifying the technology-mapped critical path, producing the technology-independent circuit, calculating the scale factor, applying the scale factor, and restructuring the technology-independent circuit are repeated to optimize the circuit. 25. A computer program product for estimating delays in a circuit, comprising a computer usable medium having a machine readable code embodied therein for performing the steps of: selecting a first path in the circuit; calculating a technology-mapped delay for the first path; calculating a technology-independent delay for the first path; dynamically calculating a scale factor from the technology-mapped delay and the technology-independent delay, wherein the step of calculating the scale factor includes dividing the technology-mapped delay by the technology independent delay; and applying the scale factor to at least one delay circuit, wherein the step of applying the scale factor includes multiplying the at least one delay by the scale factor. 26. The computer program product as recited in claim 25, wherein the step of selecting the first path includes choosing a critical path in the circuit. 27. The computer program product as recited in claim 26, wherein the step of calculating the scale factor includes dividing the technology-mapped delay by the technology-independent delay. 28. The computer program product as recited in claim 27, wherein the step of applying the scale factor includes multiplying the at least one delay by the scale factor. 29. The computer program product as recited in claim 28, wherein the machine readable code is further for performing the step of converting a technology-mapping of the circuit to a technology-independent form of the circuit. 30. The computer program product as recited in claim 29, wherein the step of applying the scale factor inc ludes applying the scale factor to at least one delay in the technology-independent circuit. 31. The computer program product as recited in claim 29, wherein the step of converting the technology-mapped circuit to the technology-independent circuit includes choosing representative functions such that every function in the technology-mapped circuit can be represented in the technology-independent circuit. 32. The computer program product as recited in claim 31, wherein the representative functions are included in a set selected from the group consisting of {NAND,INV}, {NOR, INV}, {AND, INV}, {OR, INV}, and {NOR, NAND, INV}. 33. The computer program product as recited in claim 32, wherein the representative functions are 2-input NAND and INV. 34. The computer program product as recited in claim 31, wherein the representative functions are chosen from a technology library, and wherein the machine readable code is further for performing the step of determining at least one characterized delay from the technology library for at least one of the representative functions. 35. The computer program product as recited in claim 34, wherein the step of calculating the technology-independent delay includes using the at least one characterized delay. 36. The computer program product as recited in claim 29, wherein the step of converting is performed before the step of calculating the technology-independent delay, and the step of calculating the technology-independent delay includes choosing an apparent critical path corresponding to the first path. 37. An automated design system for estimating delays in a circuit, comprising: a processor; and a memory in communication with the processor; wherein the processor is configured to select a first path in the circuit, calculate a technology-mapped delay for the first path, calculate a technology-independent delay for the first path, dynamically calculate a scale factor from the technology-mapped delay and the technology-independent delay, wherein the step of calculating the scale factor includes dividing the technology-mapped delay by the technology independent delay, and apply the scale factor to at least one delay in the circuit, wherein the step of applying the scale factor includes multiplying the at least one delay by the scale factor. 38. The automated design system as recited in claim 37, wherein the processor is further configured to select the first path by choosing a critical path in the circuit. 39. The automated design system as recited in claim 38, wherein the processor is further configured to calculate the scale factor by dividing the technology-independent delay into the technology-mapped delay. 40. The automated design system as recited in claim 39, wherein the processor is further configured to apply the scale factor by multiplying the at least one delay by the scale factor. 41. The automated design system as recited in claim 40, wherein the processor is further configured to convert a technology-mapping of the circuit to a technology-independent form of the circuit. 42. The automated design system as recited in claim 41, wherein the processor is further configured to apply the scale factor to at least one delay in the technology-independent circuit. 43. The automated design system as recited in claim 41, wherein the processor is further configured to convert the technology-mapped circuit to the technology-independent circuit by choosing representative functions such that every function in the technology-mapped circuit can be represented in the technology-independent circuit. 44. The automated design system as recited in claim 43, wherein the representative functions are included in a set selected from the group consisting of {NAND,INV}, {NOR, INV}, {AND, INV}, {OR, INV}, and {NOR, NAND, INV}. 45. The automated design system as recited in claim 44, wherein the representative functions are INV and 2-input NAND. 46. The automated design system as recited in claim 43, wherein
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