Layout methodology that automates layout rule verification for differential signal trace pairs

Abstract

A layout method that automates layout rule verification for differential signal trace pairs. The method includes the following steps: a. Obtain the name and center coordinates of each signal line in a differential signal line pair from a line data. b. Obtain line width data and line spacing data of each of the above signal lines from a network type data according to the names of the above signal lines. c. According to the obtained trace center coordinates and trace width data, it is judged whether each pair of parallel line segments in the differential signal trace pair does not conform to the trace distance contained in the trace data. d. Calculate the length of the above-mentioned signal traces according to the obtained trace center coordinates, so as to determine whether the length difference of the signal traces in the differential signal trace pair is within an allowable error range. e. According to the coordinates of the above-mentioned routing centers, it is judged whether the same pair of parallel line segments is sandwiched by two copper-laying areas for supplying different power types in the differential signal routing pairs.

Description

Technical field [0001] The present invention relates to a technology in the field of layout, in particular to a layout method. Background technique [0002] In the production of Printed Circuit Board (PCB), in the layout of multilayer boards, traces are often used to travel in different layers through vias. , In order to connect the components placed on the two surfaces of the circuit board, or connect the components on the surface of the circuit board to the power copper area of ​​the inner layer of the circuit board. figure 1 It is a schematic diagram of routing through through holes. Such as figure 1 As shown, this circuit board is divided into eight layers for wiring, which are labeled L1 to L8, respectively, and the wiring 102 connects the components 106 and 108 through through holes (as shown by the label 104). [0003] In some special circuit designs, differential traces are used for layout. The differential signal trace pair is a very special signal in a printed circuit b...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a layout method that can automatically perform the layout rule inspection of differential signal wiring pairs, so as to solve the problem that the conventional layout method is easy to be artificial due to manually confirming the layout rules of differential signal wiring pairs. Negligence, which leads to poor quality of the designed printed circuit board, and avoids reducing the work efficiency of the layout engineer due to human operation

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