Wiring placement method of wirings having different length and semiconductor integrated circuit device

Abstract

A wiring placement method of placing a plurality of wirings of different lengths in parallel on a plane includes placing a longest wiring and a shortest wiring alongside each other among the plurality of wirings (a) placing a longest wiring from among remaining wires which have not been placed yet, alongside an outside of a space surrounded by the wirings already placed and on a side of a shorter wiring of the wrings placed at outermost ends, (b) placing a shortest wiring from among remaining wires which have not placed yet, alongside an outside of a space surrounded by the wirings already placed and on a side of a longer wiring of the wirings placed at outermost ends, and alternately repeating (a) and (b) to place the plurality of wirings.

What is claimed is: 
     
         1 . A wiring placement method of placing a plurality of wirings of different lengths in parallel on a plane, said method comprising:
 placing a longest wiring and a shortest wiring alongside each other among the plurality of wirings;   (a) placing a longest wiring from among remaining wires which have not been placed yet, alongside an outside of a space surrounded by the wirings already placed and on a side of a shorter wiring of the wrings placed at outermost ends;   (b) placing a shortest wiring from among remaining wires which have not placed yet, alongside an outside of a space surrounded by the wirings already placed and on a side of a longer wiring of the wirings placed at outermost ends; and   alternately repeating (a) and (b) to place the plurality of wirings.   
     
     
         2 . The wiring placement method as claimed in  claim 1 , further comprising:
 connecting a first wiring group and a second wiring group in one on one, the first wiring group including a plurality of first wirings, each being placed in parallel with each other, having a different length, extending in a first direction and connecting to a first point, the second wiring group including a plurality of second wirings, each being placed in parallel with each other, having a different length, extending in a second direction perpendicular to the first direction and connecting to a second point,   wherein the plurality of wirings correspond to the first wiring group.   
     
     
         3 . The wiring placement method as claimed in  claim 2 , wherein the second wiring group is placed by said (a) placing, said (b) placing, and said alternatively repeating (a) and (b). 
     
     
         4 . The wiring placement method as claimed in  claim 1 , further comprising:
 connecting a first wiring group and a second wiring group in one on one via an intermediate wiring group, the first wiring group including a plurality of first wirings, each being placed in parallel with each other, having a different length, extending in a first direction on a first line and connecting to a first point, the second wiring group including a plurality of second wirings, each being placed in parallel with each other, having a different length, extending in the first direction on a second line parallel with the first line and connecting to a second point, the intermediate wiring group extending in a second direction perpendicular to the first direction;   wherein the plurality of wirings correspond to the first wiring group.   
     
     
         5 . A wiring placement method of placing a plurality of wirings of different lengths in parallel on a plane, said method comprising:
 placing a longest wiring and a shortest wiring alongside each other among the plurality of wirings; and   alternately repeating to place a longest wiring and a shortest wiring from among remaining wirings which have not been placed yet, alongside an outside of a space surrounded by the wirings already placed, so that a difference in length between a wiring to be placed as a target wiring and a wiring already adjacently placed to the target wiring is largest.   
     
     
         6 . The wiring placement method as claimed in  claim 5 , further comprising:
 connecting a first wiring group and a second wiring group in one on one, the first wiring group including a plurality of first wirings, each being placed in parallel with each other, having different length, extending in a first direction and connecting to a first point, the second wiring group including a plurality of second wirings, each being placed in parallel with each other, having a different length, extending in a second direction perpendicular to the first direction and connecting to a second point,   wherein the plurality of wirings correspond to the first wiring group.   
     
     
         7 . The wiring placement method as claimed in  claim 6 , wherein the second wiring group is placed by the placing the longest wiring and the shortest wiring alongside each other among the plurality of wirings, and the alternatively repeating to place the longest wiring and the shortest wiring from among said remaining wirings which have not been placed yet. 
     
     
         8 . The wiring placement method as claimed in  claim 5 , further comprising:
 connecting a first wiring group and a second wiring group in one on one via an intermediate wiring group, the first wiring group including a plurality of first wirings, each being placed in parallel with each other, having a different length, extending in a first direction on a first line and connecting to a first point, the second wiring group including a plurality of second wirings, each being placed in parallel with each other, having a different length, extending in the first direction on a second line parallel with the first line and connecting to a second point, the intermediate wiring group extending in a second direction perpendicular to the first direction,   wherein the plurality of wirings correspond to the first wiring group.