Abstract: A drawing device includes a memory and a processor coupled to the memory. The processor executes a process including measuring voltages of planes of layers in a laminated circuit board and drawing the voltages of the planes that are measured on a graph having a voltage set on one axis and having a layer set on the other axis.

Abstract: A design support apparatus includes an extraction part, a creation part, and a correction part. The extraction part extracts from among a power supply layer and a ground layer a range related to a signal transmission of a pair of signal transmission circuit models disposed in a predetermined layer of a substrate model having a plurality of layers. The creation part processes, based on given constrained conditions, the power supply layer and ground layer in a range extracted by the extraction part and creates a layer model. The correction part corrects the substrate model based on the created layer model.

Abstract: The apparatus comprises the syntax checking section that checks the syntax of a device model according to a check table showing the relation between the syntax of the device model showing electrical characteristics of a semiconductor device and an amendment when deviating from the syntax. The syntax error amendment creating section corrects the device model according to a corresponding amendment when a description deviating from the syntax is checked by the syntax checking section.

Abstract: In a simulation considering a skin effect, a signal conductor is vertically and horizontally divided by faces parallel to the surface of the signal conductor, which are set so that intervals are smaller as the faces are nearer to the surface, and larger as the faces are farther from the surface. Also a ground conductor is vertically divided with a similar method, and an integration calculation is made, so that the resistance of the signal conductor, which corresponds to a given frequency, is obtained.

Abstract: In a simulation considering a skin effect, a signal conductor is vertically and horizontally divided by faces parallel to the surface of the signal conductor, which are set so that intervals are smaller as the faces are nearer to the surface, and larger as the faces are farther from the surface. Also a ground conductor is vertically divided with a similar method, and an integration calculation is made, so that the resistance of the signal conductor, which corresponds to a given frequency, is obtained.

Abstract: The apparatus comprises the syntax checking section that checks the syntax of a device model according to a check table showing the relation between the syntax of the device model showing electrical characteristics of a semiconductor device and an amendment when deviating from the syntax. The syntax error amendment creating section corrects the device model according to a corresponding amendment when a description deviating from the syntax is checked by the syntax checking section.

Abstract: An automatic routing method and an automatic routing apparatus enable an optimum automatic routing under severe design conditions due to high-density mounting of an object of a wiring design such as an LSI, a multichip module, a printed wiring board, etc. The automatic routing apparatus has an area input unit for inputting area information for setting a routing controlled area in which an automatic routing is performed under specific routing control conditions within a wiring area of an object of the wiring design, a condition input unit for inputting condition information for designating the routing control conditions in the routing controlled area set according to the area information inputted from the area input unit, and an automatic routing unit for automatically routing under the specific routing control conditions designated according to the condition information inputted from the condition input unit within the routing controlled area.

Abstract: This invention is directed to a method and apparatus to find out an optimum solution in automatic routing or automatic placement with certainty and at a high-speed to improve a routing rate, and to realize automatic routing in a high-density. To these end, a routing approach is selected in a conversational mode while routing efficiency is consulted to compose routing processing procedure so as to generate a routing program. Besides, component placement processing procedures designated according to placement control information are combined to generate the placement program. A straight line between component pins adjacent to each other is defined as a chord, a wave for maze method routing is generated from a start point toward an end point of a routing path and propagated between the chords adjacent to each other.