VARIABLE SIGMA ADJUST METHODOLOGY FOR STATIC TIMING
First Claim
1. A method of adjusting process corners for adjusting timing of an integrated circuit design, said method comprising:
- establishing initial voltage sensitivity curves relating to the relationship between gate timing variations caused by voltage supply changes and gate timing variations caused by manufacturing processing changes in a circuit design for slow and fast process extremes;
establishing an initial voltage supply at which initial process corners appear on said voltage sensitivity curves;
establishing revised process corners for which initial timing requirements are to be changed into revised timing requirements;
establishing revised voltage sensitivity curves relating to said revised process corners; and
changing said initial voltage supply to a revised voltage supply to accommodate said revised timing requirements based on where said revised process corners cross said revised voltage sensitivity curves.
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Accused Products
Abstract
The invention presents a method of accommodating for across chip line variation (ACLV) and/or changing static timing of an integrated circuit design. The invention first establishes a circuit design having initial timing requirements and an initial voltage supply and also establishes a relationship between gate timing variations caused by voltage supply changes and gate timing variations caused by manufacturing processing changes. Then, according to the customer'"'"'s orders that change the initial timing requirements to revised timing requirements, the invention changes the initial voltage supply to a revised voltage supply to accommodate the revised timing requirements (and ACLV if desired) based on the relationship between voltage limits and transistor delay. This process of changing the initial voltage supply does not alter the circuit design.
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Citations
20 Claims
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1. A method of adjusting process corners for adjusting timing of an integrated circuit design, said method comprising:
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establishing initial voltage sensitivity curves relating to the relationship between gate timing variations caused by voltage supply changes and gate timing variations caused by manufacturing processing changes in a circuit design for slow and fast process extremes;
establishing an initial voltage supply at which initial process corners appear on said voltage sensitivity curves;
establishing revised process corners for which initial timing requirements are to be changed into revised timing requirements;
establishing revised voltage sensitivity curves relating to said revised process corners; and
changing said initial voltage supply to a revised voltage supply to accommodate said revised timing requirements based on where said revised process corners cross said revised voltage sensitivity curves. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of adjusting timing requirements of an integrated circuit design, said method comprising:
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establishing a circuit design having initial timing requirements and an initial voltage supply;
establishing a relationship between gate timing variations caused by voltage supply changes and gate timing variations caused by manufacturing processing changes;
changing said initial timing requirements to revised timing requirements; and
changing said initial voltage supply to a revised voltage supply to accommodate said revised timing requirements based on said relationship between gate timing variations caused by voltage supply changes and gate timing variations caused by manufacturing processing changes. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform a method of changing timing requirements of an integrated circuit design, said method comprising:
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establishing a circuit design having initial timing requirements and an initial voltage supply;
establishing a relationship between gate timing variations caused by voltage supply changes and gate timing variations caused by manufacturing processing changes;
changing said initial timing requirements to revised timing requirements; and
changing said initial voltage supply to a revised voltage supply to accommodate said revised timing requirements based on said relationship between gate timing variations caused by voltage supply changes and gate timing variations caused by manufacturing processing changes. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification