Method of designing signal distribution circuit and system for supporting the same
AssigneeNEC Electronics Corporation
InventorKazuhiro Nakajima
Life of this patent
Estimating the term…
Abstract
In a method of designing a signal distribution circuit, a plurality of circuit patterns of buffer circuits and patterns of wiring lines are arranged and connected to have a tree structure. A total delay time from an input of the buffer circuit in the highest layer of the tree structure to an output of each of the buffer circuits in the lowest layer of the tree structure is calculated. Each of the plurality of circuit patterns of the buffer circuits is selectively substituted by one of substitution patterns of substitution buffer circuits such that the total delay times fall within a predetermined range. All the outputs of the buffer circuits in the lowest layer of the tree structure are connected.
Claims15
A method of designing a signal distribution circuit, comprising:
- arranging and connecting a plurality of circuit patterns of buffer circuits and patterns of wiring lines to have a tree structure;
- calculating a total delay time from an input of said buffer circuit in the highest layer of said tree structure to an output of each of said buffer circuits in the lowest layer of said tree structure;
- selectively substituting each of said plurality of circuit patterns of said buffer circuits by one of substitution patterns of substitution buffer circuits such that said total delay times fall within a predetermined range;
- and
- connecting all the outputs of said buffer circuits in the lowest layer of said tree structure.
A design supporting system for a signal distributing circuit, comprising:
- a display unit;
- a memory which stores substitution patterns of substitution buffer circuits;
- and
- a processor which:
- controls said display unit to arrange and connect circuit patterns of a plurality of buffer circuits and patterns of wiring lines to have a tree structure,
- calculates a total delay time from an input of said buffer circuit in the highest layer of said tree structure to an output of each of said buffer circuits in the lowest layer of said tree structure,
- selectively substitutes each of said plurality of circuit patterns of said buffer circuits by one of substitution patterns of substitution buffer circuits such that said total delay times fall within a predetermined range, and
- connects all the outputs of said buffer circuits in the lowest layer of said tree structure.
A recording medium in which a program is recorded for a method of designing a signal distribution circuit, wherein said method comprises:
- arranging and connecting a plurality of circuit patterns of buffer circuits and patterns of wiring lines to have a tree structure;
- calculating a total delay time from an input of said buffer circuit in the highest layer of said tree structure to an output of each of said buffer circuits in the lowest layer of said tree structure;
- selectively substituting each of said plurality of circuit patterns of said buffer circuits by one of substitution patterns of substitution buffer circuits such that said total delay times fall within a predetermined range;
- and
- connecting all the outputs of said buffer circuits in the lowest layer of said tree structure.
Dependencies are inferred from the claim text.