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netopenlocationfinderwithobstacles's Introduction

Net Open Location Finder With Obstacles

當時稚嫩的大學專題,來自ICCAD 2017年B題目。

  • 學生:陳佳琳、劉湘怡
  • 指導教授:鄭維凱
  • 完整書面報告請見:pdf

題目:

起源: 在 IC 設計繞線(routing)時,為了節省成本及避免障礙物干擾,希望連接的 線路能越短越好。以此為背景,此專題實作的過程我們討論了各種可能,運 用資料結構及演算法,以及曾經學過的數學方法,達到線路之成本最小化。 介紹

  • 此專題配合 2017 國際積體電路競賽 ICCAD 之 Problem B 做延伸。
  • 將所有給定的藍色矩形相連接、並避免經過灰色矩形。
  • 層與層間用給定的 via 或自訂 via 連接。
  • 根據題目給的公式算出 cost,cost 越小分數越高。

目標:

  • Overall Cost = ∑Cost(Pq)

  • 若 Pq是 H-line 或 V-line,Cost(Pq)即為 H-line 或 V-line 的長度。

  • 若 Pq是 via,Cost(Pq) = Cv。

  • 目標是將 overall cost 最小化

  • 其中還有一些路徑是不合法(invalid)的,如: 介紹-不合法的

我們針對此題目提出一些原創方法,詳見:pdf

實驗結果:

版本 層數 合法矩形個數 非法矩形個數 總Path 共使用Via數 總ViaCost 總Cost 總執行時間
Case1-init 3 1503 414 53,095,736 2 20 53,095,736 204
Case1-final x x x 4326 45 450 4776 94
Case2-init 5 4518 4773 515,899,298 4 120 515,899,298 18,669
Case2-final x x x 39,806 186 5580 45,386 1019
Case3-init 5 4450 4762 4 20 x x x
Case3-final x x x 12,691 901 4505 18,196 939

結論:

在 via 之 cost 小於 100、layer 層數超過三層的情況下,雖然使用大量 via 造成 via 之 cost 增加,但整體 cost 比起層層之間只有一條 via來的好。

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