Patent ID: 7367003
Filing Date: 2008-04-29
Classification: G01R,G06F

Abstract:
1. A system for verifying trace lengths and trace spaces in a circuit, the system comprising: a database for storing information on preset design rules and computer aided design (CAD) data of a trace layout of the circuit based on a set of electro-magnetic interference (EMI) criteria; and a computer comprising a trace lengths and trace spaces verifying apparatus, the trace lengths and trace spaces verifying apparatus being for: retrieving the information of the trace layout from the database; retrieving the preset design rules; selecting a first trace in the trace layout; selecting a second trace in the trace layout; computing a trace length for each of the two traces, comprising: retrieving coordinate data of segment connecting points of each trace from the information of the trace layout; computing a length for each segment of the trace according to the coordinate data of the segment connecting points; and summing the lengths of all the segments of the trace to form the length of the trace; computing trace spaces between the two traces; verifying if the trace lengths and the trace spaces satisfy the preset design rules; repeating the trace selecting, trace computing and design rules verifying for other traces in the trace layout; and adding design rule check (DRC) markers to the trace layout, where the DRC markers indicate which trace or traces have violated the preset design rules.