Network timing analysis method which eliminates timing variation

Details Network timing analysis method which eliminates timing variation Network timing analysis method which eliminates timing variation

1994-09-30

1997-06-03

Heckler, Thomas M.

Boots, shoes, and leggings

364491, G06F 1718

Patent

active

056363729

ABSTRACT:
A method of analyzing timing differences between arrival times of distinct signals propagating through a circuit comprising: (i) identifying a first beginning point for a first data path over which data arrival times are propagated to a data endpoint; (ii) identifying a second beginning point for a second data path to the data endpoint, and for a clock path to a clock endpoint, the endpoints constituting an endpoint pair; (iii) identifying at least one common point at which the second data path and the clock path diverge; (iv) propagating data arrival times to the data endpoint from the first and second beginning points, and tagging the data arrival times propagated along the second data path with one of the common points; (v) propagating clock arrival times to the clock endpoint from the second beginning point along the clock path, and tagging the clock arrival times with one of the common points, the data and clock arrival times constituting clock/data arrival time pairs at the endpoint pair; (vi) determining the slack at the endpoint pair for the time pairs and identifying a worst time pair causing the worst slack determination; and (vii) recomputing the slack at the endpoint pair for the worst time pair, if the data arrival time in the worst time pair is tagged with the same common point, by eliminating slack caused by data and clock arrival time propagation on a shared portion of the second data path and the clock path between the second beginning point and the same common point.

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IBM Tech. Disc. Bulletin, vol. 28, No. 11, Apr. 1986 "Timing Influenced Layout Design", pp. 4981-4988.

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