TWI228021B - Method of layout for auxiliary differential signal circuit - Google Patents

Abstract

A method of layout for an auxiliary differential signal circuit comprises; using a group of differential circuits with a pre-determined construction; using a user-specified wiring initial coordinate to locate a corresponding coupled coordinate; starting from the initial coordinate to extend and perform a wiring layout; and generating a circuit extending from the coupled coordinate, thereby completing the circuit layout of differential signals.

Description

1228021 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention is a line layout method, especially a layout method for assisting differential signals. [Previous technology] In the development of laptop computers (Lap top or Not ebook), because it must meet all the requirements suitable for anytime and anywhere operation, and cater to the trend of high processing efficiency, it is bound to make the most perfect on the hardware circuit Planning structure to produce more economical, speed-oriented signal connections, so differential signals are gradually valued in the current research and development process of notebook computers. 0 Differential signals have high speed, low voltage, and low power. The advantages are more and more widely used, so the consideration of impedance matching in the circuit board wiring principles is very important, and the wires on the circuit board have electrical characteristics such as resistance, capacitance and inductance. In high frequency circuit design, the circuit board Capacitance and inductance on the line make the wire equivalent to a transmission line. The transmission line is the sum of all conductors and their ground loops. When the impedance of the line on the transmission line does not match the external load, it will cause signal reflection and cause signal integrity problems. The impedance of the circuit will make the signal not reach the specified voltage amplitude and affect the signal integrity. Therefore, in order to maintain the signal quality of the differential signal, the wiring considerations on the circuit layout must be rigorous. At present, it is generally used in the soft system of circuit board wiring By setting the differential signal group in advance, the wiring engineer is reminded of the position of the paired signals so that the impedance matching conditions are met during the wiring process, to avoid weakening the signal due to the reflection effect of the ribbon, and the added common mode.

1228021 V. Description of the invention (2) _ Noise, to avoid the occurrence of electromagnetic interference (EM I), or the engineer to manually record the pairings with differential signal interaction, and then carefully consider each pair of differentials in the wiring process. The layout of one of the signal lines is performed first, and then the layout of the other is performed. However, in the circuit board layout with many lines and clutter, the signal is often caused by negligence. [Summary of the Invention]

The technical problem to be solved by the present invention is how to propose a method for assisting circuit layout, especially for two wires with differential signal interaction, so that the differential signal from the transmitting end to the receiving end and even the path through the layer are both Adhere to the exact requirements of impedance matching, and use adjacent wiring to maintain signal integrity.

In view of this, the present invention proposes a method for assisting the layout of differential signal lines, so that during the layout of the differential signal lines, when one of the signal lines is selected for wiring, the other signal line is also significantly represented. In this way, the wiring operator is reminded to pay attention, and in the process of wiring, the wiring of the dual signal line is completed, that is, when the wiring of one signal line is completed, the positioning of the other signal line is also adjacent to the wiring. To achieve the purpose of controlling the layout of the differential signals to maintain the signal quality, the steps included in the present invention include first establishing a differential signal group comparison table, and then according to the starting coordinates and the differential signal group comparison table, The program obtains the corresponding co-coordinates, and finally uses the starting coordinates and the dual coordinates as the starting points to generate two parallel signal lines at the same time by using the wiring program, thereby forming a differential signal line, and ending the steps disclosed in the present invention; Where the starting coordinates

Page 6 1228021 V. Description of the invention (3) 丨 舁 The distance between the dual coordinates is' ^ ---. The extension of the signal line ## ϋ # 丨 r implementation] "To maintain a specific room, please refer to" Method 1 of Figure 1 = Method Flowchart. Π Cut out the number table of the auxiliary differential signal pin derived as disclosed (step 1〇 .), The combination of coffee and line, and the differential signal pair Zhao inch 疋 constitutes the corresponding number of dual coordinates of the differential signal, use ϋ 含 to include a number of initial seatpost values with = after 'other-dual reference point at Correspondence coordinates of the two places at the same time and from then on can produce prompts at the same time. The delivery can be actively prompted by being clicked. By changing the line, it can form a differential message to remind the wiring operator < the people who owe dual coordinates are relatively present. 〆Dual; The ones based on the starting coordinates are used to obtain the phase and differential signal groups based on the comparison procedure of I, I, and in the process of I, 糸 the corresponding dual coordinates (step 9 according to the table, by ig senses that the person who wants to enter the wiring is 0), at the wiring number group 号 ::: The location will be judged first, so the L sub ..., the table, that is, whether it is a differential Letter. The pair of dual coordinate sets; The difference b is specified at the position of the coordinate point on the circuit board, and the clothes are placed, such as a keyboard or one of the differential signal circuits. The screen displays the original setting to form any obvious representation of the dual coordinates. However, when the wiringr 2 does not When there are two coordinate points that have been set to constitute a differential signal, one coordinate point is specified by the operator, and the other two, when there is a horse point, it will be actively mentioned. Page 7: Description of the invention (4) The circuit showing the number of μ ~ ^ displayed by the five display wiring: Dagger: Shi; ::: Effective helper-each-produced quality, you pay attention to these two lines at the same time: ί: m ί movement signal line formation Router Yu Buzhi's Zhao Shi trend to effectively maintain the signal σ dyke leakage which constitutes a differential; no extra effort is needed to confirm; the sequence is the same as the starting coordinates and ;;;;; two (step two

^ ^ ^ ^ ^ ^ ^ ^ jt ^ M # -¾ ^ ^ ^, The program steps of the wiring include the starting point of the second coordinate, starting with the starting point, and the coordinates of A points, which form the first-f program, from the starting coordinate. The generated number is the description of the routing program through the keyboard or mouse, step 310), which turns into a description of the program traces, so as to generate multiple grounds to reach the track number of the line, and then to form a brother-line, provide the letter Based on this, a number of corresponding coordinates are generated. According to the coordinates and formulas at this point, the way (step 3 2). 'Which formula is it? The two-coordinate coordinate will form the second line and the second line. The timing of the generation of the two lines has two kinds of distances: 1. The distance between the first line and the second line is explained. A simple example will start from §. After the starting coordinates are specified, multiple point coordinates are generated. By doing this, the starting attacker can start the starting coordinates. Several points are formed in succession to form a two-line circuit. From one starting coordinate, the system will use two according to the formula. The mother w generates a new point coordinate and the corresponding coordinate that extends behind it. ^ Line production :: J ί, then dual, and 玍 为 are the second line, reaching 1228021 V. Description of the invention (5) The first line is the same as the second line Formation, where a certain distance is maintained between the starting coordinates and the dual coordinates, and between the extended signal lines, and the specific distance is to maintain the signal integrity of the differential signal line (Signa 1 I ntegrity)

O Another routing procedure is that the first line is completed first by the coordinate of the starting coordinates and then the point coordinates, and then the system will calculate all the correspondences according to the point coordinates (including the starting coordinates) that make up the first line. Coordinates, when the second line is completed, the specific distance is maintained between the starting coordinates and the dual coordinates, and between the extended signal lines.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention; that is, all equivalent changes and modifications made in accordance with the scope of the patent application for the present invention are covered by the scope of the patent for the present invention .

Page 1228021 Brief Description of Drawings Figure 1 is a flowchart illustrating the layout method of the auxiliary differential signal line disclosed in the present invention; and Figure 2 is a flowchart illustrating the steps of the wiring procedure disclosed in the present invention. Description of graphical symbols] Step 1 0 0 Create a differential signal group comparison table Step 2 0 0 According to an initial coordinate and the differential signal group comparison table, obtain a corresponding pair of even coordinates through a comparison procedure Step 3 0 0 Use the starting coordinates and the dual coordinates as starting points, and use a wiring program to simultaneously generate two parallel signal lines to form the differential signal line. Step 3 1 0 Use an input program from the start The coordinates generate a plurality of point coordinates to form a first line. Step 3 2 0 According to the point coordinates and a formula, a plurality of corresponding coordinates are generated, and the corresponding coordinates form a second line.

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Claims (1)

1228021_ VI. Scope of patent application 1. A layout method of auxiliary differential signal lines, including the following steps: establishing a differential signal group comparison table; according to an initial coordinate and the differential signal group comparison table, a ratio Use the program to obtain the corresponding pair of coordinates; and use the starting coordinate and the pair of coordinates as starting points to generate two parallel signal lines using a wiring program to form the differential signal line; A specific distance is maintained between the dual coordinates and the extended signal lines. 2. The auxiliary layout method of the differential signal line as described in item 1 of the scope of the patent application, wherein the differential signal group comparison table includes a plurality of starting coordinate values and corresponding plurality of dual coordinate values. 3. The auxiliary layout method of the differential signal line as described in item 1 of the scope of the patent application, wherein the dual coordinates are displayed by changing the display mode of the dual coordinates relative to one of the other coordinates. 4. The auxiliary layout method of the differential signal line as described in item 1 of the scope of the patent application, wherein the specific distance is used to maintain the signal integrity of the differential signal line (Signal Integrity). 5. The auxiliary layout method of the differential signal line as described in item 1 of the scope of patent application, wherein the coordinate value of the starting coordinate exists in the differential signal group comparison table. 6. The auxiliary layout method of the differential signal line as described in item 1 of the scope of patent application, wherein the wiring procedure includes the following steps: using an input program to generate a plurality of point positions from the starting coordinates Page 11 1228021 6. The scope of the patent application to form a first line; and according to the coordinate of the point and a formula, a plurality of corresponding coordinates are generated, and the corresponding coordinates constitute a second line. 7. The auxiliary layout method of the differential signal line as described in item 6 of the scope of the patent application, wherein the first line and the second line are simultaneously wired. 8. The auxiliary layout method of the differential signal line as described in item 6 of the scope of the patent application, wherein the first line is completed before the second line. 9. The auxiliary layout method of the differential signal line as described in item 6 of the scope of patent application, wherein the input procedure is completed by a user operating a keyboard. 10. The auxiliary layout method of the differential signal line as described in item 6 of the scope of the patent application, wherein the formula is used to maintain the specific distance between the first line and the second line. Page 12