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Correction to "Boundary single-layer routing with movable terminals"

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2 Author(s)
Kuo-Feng Liao ; Dept. of Electr. Eng. & Comput. Sci., Northwestern Univ., Evanston, IL, USA ; Sarrafzadeh, M.

In boundary single-layer routing with slidable or permutable terminals (BSLR-S or BSLR-P), the assumption that each net may have more than one terminal in a range or cluster should be removed. An example that shows Pick-Closest might report "unsolvable" for a solvable instance is considered. It is clear that the instance is solvable if (and only if) the two terminals of net N/sub 1/ are assigned to vertices c and d. However, Pick-Closest will assign the two terminals of net N/sub 1/ to vertices /spl lcub/b,c/spl rcub/ or /spl lcub/d,e/spl rcub/, then report "unsolvable" due to the failure in routing net N/sub 2/. Thus, Pick-Closest only works in instances when each net has at most one terminal in a range. Since BSLR-P also includes slidable terminals, we employ Pick-Closest to solve BSLR-P when TR-permutation is determined by Greedy-Assignment. Thus in BSLR-P, each net can have at most one terminal in a cluster as well. The time complexity of the problem of boundary single-layer routing with slidable and permutable terminals remains open if a net is allowed to have multiple terminals in a cluster.<>

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:13 ,  Issue: 5 )