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A New Routing Method Considering Neighboring-Wire Capacitance Constraints
Takumi WATANABE Kimihiro YAMAKOSHI Hitoshi KITAZAWA
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/12/25
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: VLSI Design Technology and CAD
routing, wire capacitance, deep-submicron design, CAD, VLSI,
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This paper presents a new routing method that takes into account neighboring-wire-capacitance (inter-layer and intra-layer) constraints. Intermediate routing (IR) assigns each H/V wire segment to the detailed routing (DR) grid using global routing (GR) results, considering the neighboring-wire constraints (NWC) for critical nets. In DR, the results of IR for constrained nets and their neighboring wires are preserved, and violations that occur in IR are corrected. A simple method for setting NWC that satisfy the initial wire capacitance given in a set-wire-load (SWL) file is also presented. The routing method enables more accurate delay evaluation by considering inter-wire capacitance before DR, and avoids long and costly turnaround in deepsubmicron layout design. Experimental results using MCNC benchmark test data shows that the errors between the maximum delay from IR and that from DR for each net were less than 5% for long (long delay) nets.