JP5260415B2 - Printed wiring pattern display device and system using the same - Google Patents

Description

The present invention relates to an apparatus used in a printed circuit board design apparatus or an LSI wiring design apparatus based on computer-aided design (CAD), and a line segment display apparatus for comparing wiring routes and distances or a system using the same About.

In the design of printed circuit boards, the placement of components to realize the logical design results of circuit design on the physical printed circuit board, and the printed wiring pattern length of the signal lines that connect the components at the printed wiring pattern design stage. May have to be equal, or the printed wiring pattern length difference may have to be within a certain distance.

  Further, when the printed wiring pattern is branched, it is required that the difference in the printed wiring pattern length after the branching is within a certain range so as not to be affected by the reflection of the electric signal.

  In such a case, in order to confirm that the completed printed wiring pattern length is designed without any problem, it is necessary to investigate and compare all the printed wiring pattern lengths of the signal lines that must be designed with the same length. Is required. Also, if the condition of equal length is not satisfied, which printed wiring pattern does not satisfy the condition, how long it is, and how much it affects other circuits to improve it. It was necessary to know and was a burden for the printed wiring pattern designer.

  Therefore, Patent Document 1 discloses an invention for improving the efficiency of design and confirmation work in order to solve the above problems.

JP 2000-206171 A

In Patent Document 1, when designing a printed wiring pattern, a study has been made to perform a design in which a phase difference between a + signal and a − signal of a differential signal line of the wiring pattern does not occur. This is a method of calculating the occurrence location and warning the location.For locations where many printed wiring patterns are concentrated at high density, the route of the target printed wiring pattern on the printed circuit board It was difficult to check whether it was running, and it was difficult to see the relationship with the surroundings when improving the printed wiring pattern.

A printed wiring pattern display device or system according to the present invention is a printed wiring pattern display device or system in a CAD system for designing an electronic circuit, and includes a CPU and a memory, and displays a plurality of printed wiring patterns. Display means for designating, designating means for designating an arbitrary printed wiring pattern from a plurality of printed wiring patterns, and pattern length designating means for designating a printed wiring pattern length for the printed wiring pattern designated by the designating means, And the specified pattern length is displayed on the printed wiring pattern displayed on the display means according to the movement amount of the pattern length specifying means.

According to the present invention, it is possible to easily verify whether or not a reference is satisfied for a signal line at the time of designing a printed wiring pattern of a printed circuit board or after completion of the printed wiring pattern design.

Configuration of apparatus or apparatus system according to the present invention Net information table on printed circuit board Printed wiring pattern information table on printed circuit board Component mounting position information table on printed circuit board Component shape information table on printed circuit board Drawing state information table Mouse state table Drawing drawing basic information table Point type information table Layer information table Example flow chart Example flow chart Example of drawing only one signal in the example Example of drawing multiple signals in embodiment Example of drawing multiple layers of multiple signals in an embodiment Example of drawing target signal layer of multiple signals in embodiment Example of drawing X component of target signal layer of plural signals in embodiment Signal propagation delay time display drawing example of target signal layer of plural signals of embodiment Example of printed wiring pattern information table for patterns having branches Printed wiring pattern example of patterns with branches Example of drawing state information table for patterns with branches Example of selecting a target signal by selecting a printed wiring pattern being drawn Example of flowchart for overwriting printed wiring pattern by giving distance of embodiment from keyboard Example of flow chart including element of signal propagation delay time of example

  The present invention relates to an apparatus (system) 10 having a CPU 1, an internal memory 3, an external memory 2, a mouse 5, a keyboard 6 and a display means 4 such as a touch panel or a display and a line segment for displaying a processing target object as a shape. Is stored in the internal memory 3 or the external memory 2 (hereinafter referred to as memory), and a part of the characteristic information of the shape information and line segment information stored in the memory is instructed from the outside. Then, an arbitrary shape or line segment is selected from the information in the memory, and the selected information is displayed on the display means 4 by the display processing by the CPU 1, and the CPU 1 moves the mouse 5 to According to the amount of movement of the mouse 5, it can be realized by overwriting the selected line segment with a line segment of different brightness, color and thickness.

  According to the embodiment of the present invention, it is possible to easily verify whether or not a reference is satisfied for a signal line at the time of designing a printed wiring pattern of a printed circuit board or after completion of the printed wiring pattern design. it can. For example, whether the line length specified in the design standard is satisfied, whether the printed wiring pattern that signals must run in parallel conforms to the restrictions, and whether the printed wiring pattern length satisfies the restrictions When verifying, it can be easily verified in a short time.

  In particular, the feature of the apparatus (system) 10 according to the embodiment of the present invention is that there is no need to trace the printed wiring pattern to be processed on the drawing with the mouse, and the printed wiring pattern once selected as the display target is the operation of the mouse. The locus is displayed in synchronization with the.

  In other words, even if the mouse is moved without being aware of the shape of the printed wiring pattern to be tracked selected by the designer, the printed wiring pattern to be processed can be highlighted according to the amount of movement of the mouse. .

  In addition to the mouse described here, the printed wiring pattern designating means can be processed in the same manner by designating means such as moving the touch pen or touch display with a finger and designating the amount of movement.

Here, technical features according to the present invention will be described.
A printed wiring pattern display device according to the present invention or a system using the printed wiring pattern display device is a printed wiring pattern display device or system in a CAD system for designing an electronic circuit, and the printed wiring pattern display device includes a CPU, a memory, A display means for displaying one or more printed wiring patterns, a designation means for designating an arbitrary printed wiring pattern from one or more printed wiring patterns, and a printed wiring pattern designated by the designation means, A printed wiring pattern length specifying means for specifying a printed wiring pattern length;
The specified printed wiring pattern length is displayed on the printed wiring pattern displayed on the display means according to the movement amount of the printed wiring pattern length specifying means.
In addition, a signal propagation delay time designating unit for designating a signal propagation delay time for propagating the printed wiring pattern with respect to the printed wiring pattern designated by the designating unit is provided, and the signal propagation delay time given by the signal propagation delay time designating unit is provided. The printed wiring pattern length is calculated from the above, and the calculated printed wiring pattern length is displayed on the printed wiring pattern displayed on the display means.

  Furthermore, a printed wiring pattern display device in a CAD system for designing an electronic circuit, the printed wiring pattern display device having a CPU and a memory, and a display means for displaying one or more printed wiring patterns , Comprising a designation means for designating an arbitrary printed wiring pattern from one or more printed wiring patterns, and a pattern length designation means for designating a printed wiring pattern length for the printed wiring pattern designated by the designation means. In synchronization with the movement amount of the wiring pattern length designation means, the specified printed wiring pattern length is displayed on the printed wiring pattern displayed on the display means, and the calculated printed wiring pattern length is displayed and the printed wiring pattern length is designated. Printed wiring pattern length or printed wiring pattern specified by And displaying the combined signal propagation delay time over emissions.

A printed wiring pattern display device system according to the present invention is a printed wiring pattern display device system in a CAD system for designing an electronic circuit, and the printed wiring pattern display device system has a CPU and a memory. Display means for displaying one or more printed wiring patterns, designation means for designating an arbitrary printed wiring pattern from the one or more printed wiring patterns, and a printed wiring pattern for the printed wiring pattern designated by the designation means. A printed wiring pattern length designating means for designating a length, and a length of the printed wiring pattern designated by the designating means from at least one of the movement amount of the printed wiring pattern length designating means and the signal propagation delay time. Is calculated on the specified printed wiring pattern. It said printed wiring pattern length, and displaying.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an application example at the time of designing a printed circuit board according to one embodiment of the present invention will be described in detail with reference to the drawings.

  First, the apparatus (system) 10 of the present invention comprises a CPU 1, an internal memory 3, an external memory 2, a display 4, a mouse 5, and a keyboard 6 shown in FIG.

  Next, an embodiment of software operating in the memory will be described with reference to FIG.

  In process 701, design data of the processing target printed circuit board is read from the external memory 2, and circuit connection information table 201, printed wiring pattern information table 300, component mounting position table 310, figure drawing data table 315, point type table 401, interlayer A distance table 501 is created on the internal memory 3.

  The storage format of various data on the external memory 2 has the same form as the circuit connection information table 201, the printed wiring pattern information table 300, the graphic drawing data table 315, the point type table 401, and the interlayer distance table 501 to be read. The difference is the data group, and the difference is that the table created in the internal memory 3 deletes information unrelated to the present invention at the time of reading and extracts only the information necessary for the present invention.

  Further, the information added in the current process is that items of the processed length 312a and the remaining length 313a of the printed wiring pattern information table 300 are provided.

  The circuit connection information table 201 represents a connection relationship of logical circuit information. When there are a plurality of component pin connections at the same potential, a plurality of rows of mounting positions 203 and pin numbers 204 of the same signal name 202 are registered. The In the example of FIG. 2, the circuit connection of the signal name 202 of sig1 indicates that the signal line is connected from the pin 001 of the component at the mounting position 203 named IC01 to the pin 002 of the component at the mounting position 203 named IC002. .

  A printed wiring pattern information table 300 shown in FIG. 3 corresponds to the circuit connection information table 201 and stores physical design information. In this table, the signal name 202 registered in the circuit connection information table 201 expresses on what route the printed circuit board travels from the From side to the To side. One row of this table represents one section of the printed wiring pattern, and one section is a line connecting from the component pin 902 to the turning point 905 as a line segment 903 expressed as a section in FIG. This is a line segment connected from the minute or turning point 905 to the turning point 906, and one signal line is composed of one or more sections.

  The printed wiring pattern information table 300 in FIG. 3 holds printed wiring pattern information for each section. The signal name 301 corresponds to the signal name in the circuit connection information table 201, and the branch level 301a is the branch number from the first branch when the signal to be processed is branched into a plurality of printed wiring patterns. It represents whether there is. A width 302 represents the line width of the printed wiring pattern. The individual section length 303 represents the length of the section. Further, the point type 304 on the From side of the table represents the type of the start position of the section of interest. For example, the point type 304 in the figure expresses Pin, indicating that the point at the start position of this section is a component pin. The point type 308 on the To side is L, which indicates that this point is a turning point. The From side and To side X coordinates 305 and 309, and Y coordinates 306 and 310a represent the start and end positions of the section. The layers 307 and 311a represent layers constituting the printed wiring board constituting the printed circuit board, and express which layer the focused section belongs to. For example, when three points A, B, and C are connected, the section is expressed as AB and BC.

  The processed length 312a represents the already drawn section length of the section, and the remaining length 313a represents the undrawn section length.

  FIG. 4 is a component mounting position information table 310 showing the mounting position of the component on the printed circuit board for drawing the printed circuit board. The mounting position name 100 is a name for identifying the location, and X The coordinates 101 and the Y coordinate 102 indicate the physical position, and the component type 103 is a name representing the physical shape of the component.

  FIG. 5 is a part shape information table 315 showing the specific shape of the physical shape, and the part type name 104 corresponds to the part type name 103 of FIG. The shape of the part can be known by searching the part type name 104 in FIG.

  The component shape information table 315 is a table in which the shape of a component is decomposed into straight line segments and stored in the table. An X coordinate 105, Y coordinate 106 on the From side and an X coordinate 107, Y coordinate 108 on the To side represent one line segment of the part shape, and the next line is the coordinates on the To side of the previous line. Becomes the coordinates on the From side and becomes the start position of the next line segment. By repeating this one after another, the part shape can be drawn.

  FIG. 6 is a drawing state table 320 for storing the drawing state, which represents which signal is used to draw which section and how far the line segment of the printed wiring pattern of interest is drawn. The signal name 321 is an area for storing the signal name to be processed, and the branch level 322 indicates the number of the branch level currently being processed. The total line length 323 represents the length of the entire printed wiring pattern length of the signal of interest, and the branch section start position 324a indicates the start position of the section where the first branch exists at the target branch level 322 of the signal of interest. . The section 324b being processed indicates which section of one or a plurality of sections of the signal of interest is being drawn. The overwritten line length 325 indicates how much of the total line length has been overwritten, and the remaining drawable length 326 represents the length of the printed wiring pattern that has not been overwritten.

FIG. 7 is a mouse state table 3300 for storing the operation of the mouse 5 and stores the state of the mouse 5. The mouse processing sign 330 is turned on while the left button of the mouse is pressed, and the position of the mouse when the mouse is pressed is stored in the Xs coordinate and Ys coordinate of the mouse movement start position 331, and the mouse 5 left When the button is released, it is turned off, and the position of the mouse 5 when released is stored in the mouse movement end position 332. The coordinates of the mouse 5 at this time do not need to match the coordinates of the drawing of the processing target printed circuit board. The length 333 to be overwritten stores the distance moved while the left button of the mouse 5 is being pressed. Each time this operation is repeated, the length calculates the amount of movement and adds it to the previous length.
Next, the processing proceeds to processing 702, and a connection diagram of components of the processing target printed circuit board and the printed wiring pattern is displayed on the graphic display (hereinafter referred to as display) 4 using these data tables.

  FIG. 8 is a drawing drawing basic information table 340, where the drawing display magnification 341 represents the relationship between the amount of movement of the mouse and the amount of movement in the drawing area, and the unit length signal propagation delay time 342 is a printed wiring pattern of a certain distance. This defines the signal propagation delay time.

  As a connection diagram display method, a drawing layer 1050 for the overall diagram shown in FIG. 15 is provided on the internal memory 3, an overall diagram is created on the layer 1050, and displayed on the screen.

  4 extracts the shape of the component registered in the mounting position name 100 of the mounting position table 310 from the component shape table of FIG. 5, and places the component shape information table in the location indicated by the X coordinate 101 and Y coordinate 102 of the component mounting position. A line is drawn from the X coordinate 105 and Y coordinate 106 on the From side registered in 315 toward the X coordinate 107 and Y coordinate 108 on the To side. By repeating this process for data having the same component type name 104, a figure can be drawn. By executing this for all components registered in the component mounting position information table 310, it is possible to draw a diagram of all components on the processing target printed circuit board.

  The printed wiring pattern is drawn from the From side X coordinate 305 and Y coordinate 306 to the point indicated by the To side X coordinate 309 and Y coordinate 310a in the printed wiring pattern section of the printed wiring pattern information table 301 in FIG. You can draw by drawing. The section is a continuous line segment from a component pin or bending point to the next component pin or bending point as shown in FIG.

  By drawing the section on the printed wiring pattern information table 301 for all the sections on the table, the printed wiring pattern can be drawn.

  At this time, when it is desired to describe the bending point, the start and end positions in more detail, information such as the line width 302, the point types 304 and 308, and the layers 307 and 311a where the printed wiring pattern exists is used. It is possible to display more detailed information. FIG. 9 shows an example of detailed information of point types. The name 402 represents the name of the type of the bending point, and the shape 403 represents the shape of the point type when displayed on the drawing. The shape 403 represents a radius 408 for drawing a circle, a triangle or a quadrangle such as a pin. It has drawing section information 404 to 406 for expression. When this information is drawn, it can be realized by drawing the sections registered as 1st 404 to 2nd 405 and 2nd 405 to 3rd 406 one after another. The positions for drawing the point types are the positions of the point types 304 and 308 in the printed wiring pattern information table 301.

  FIG. 10 shows an example in which the thickness of the printed circuit board layer is defined. This information holds the thickness of the layer 502 as the distance 503 so that it can be used when the line length is more strictly evaluated. A signal propagation delay time 504 that propagates between layers 502 is also defined.

  In process 703, a message prompting the input of the signal name to be processed is displayed on the display 4. When the apparatus (system) user inputs the processing target signal name from the keyboard 6, the processing target signal name is registered in the signal name 321 of the drawing state table 320 in processing 705.

  In process 704, if no signal name is input and the keyboard 6 is idlely transmitted, it is determined that the input of the instruction signal name is completed, and the process proceeds to process 706. In process 706, it is determined whether or not there are one or more instruction signal names. If the instruction signal name is zero, the process proceeds to process 707 and the process is terminated.

  If there are one or more instruction signal names to be processed, the process proceeds to process 706a to initialize the contents of the process table. The initial setting is to turn off the mouse processing sign 330, set the coordinates of the mouse movement start position 331 to 0, and set the mouse movement end position to 0. Next, the length 333 to be overwritten is reset to zero.

  As an initial setting process, the sum of the individual section lengths 303 of the printed wiring pattern table 300 is obtained and set in the total line length 323 corresponding to the signal name 321 designated from the outside, and the printed wiring pattern corresponding to the processing target signal 321 is set. The processed length 312 a of the table 300 is reset to 0, and the corresponding remaining length 313 a is set to the same value as the individual section length 303. Next, the position 324b of the processing section in the drawing state table 320 is set to 1, the overwritten length 325 is set to 0, and the value of the total line length 323 is set to the remaining drawable length 326. This initial setting process is performed for all signal names instructed from the outside. The initial setting of the branch level 301a is also performed at this time.

  The branch level is, for example, if there are three component pins when paying attention to one signal line, the printed wiring pattern will branch into two, and the number of branches from which start section the target section is counted It represents whether it belongs to. This example shows the state of the branch in FIG. 20, and FIG. 19 shows an embodiment in which the branch is created on the printed wiring pattern information table 300. FIG. 21 shows an embodiment in which the drawing state table 320 at this time is created.

  Next, the brightness of the drawing layer 1050 for the overall view shown in FIG. 15 currently displayed on the display 4 is lowered to make the overall view a low brightness display, and the printed wiring patterns 1001 and 1002 of the instruction signal names of the processing target printed circuit boards are displayed. Only 1111 and 1112 are drawn on the overwriting drawing layer 1100 with normal display brightness.

  A layer is a memory area secured for each type of drawing. In this example, there are two types of layers: a layer for describing drawing information for displaying the whole of FIG. 15 and a layer for overwriting in FIG. Provided. Hereinafter, it is assumed that all information to be overwritten is registered and drawn in the drawing layer 1100 for overwriting in FIG. At this time, the drawing layer 1050 and the overwriting drawing layer 1100 have the same coordinate system.

  Next, if an event has occurred in which the mouse operation message queue that informs the state of the mouse 5 provided by the operating system is informed of the state of the mouse operation message queue and the left mouse button is pressed, the process proceeds to step 710 and the mouse state is reached. The processing sign 330 in the table 3300 is set to ON, and the coordinates of the position where the mouse is pressed in the process 711 are set to the mouse movement start position 331. The time interval between mouse operation events is defined at the start of the program.

  When this process ends, the process returns to process 709, and the mouse operation message queue is referred to in order to detect the next mouse operation state.

  If an event in which the mouse is moving is detected, the process proceeds to process 712 to determine whether the mouse processing sign 330 is on. If it is off, it is not a process target, so the process returns to process 709. If it is on, the process proceeds to processing 713, the coordinates at the time of the event occurrence are taken out, and set to the movement end position 332. Next, the distance moved by the mouse 5 is obtained and added to the length 333 to be overwritten. When determining the movement distance of the mouse 5, the method of calculating with the movement amount of only the X component of the mouse 5, the method of calculating with the sum of the movement amounts of X and Y, the square of the movement amount of the X component and the movement amount of the Y component There are various methods such as adding the square of ½ and raising the square to 1/2, but here, a method of applying the sum of the squares of the moving amounts of the last X and Y components to ½ is applied. In addition, in order to recognize the moving direction of the mouse, when the end position 332-start position 331 of the X component of the mouse 5 is a negative numerical value, it is negative from the end position of the overwritten printed wiring pattern toward the start position. The overwritten line is deleted by the amount of movement.

  In process 714, all printed wiring patterns of the signal to be processed are overwritten by the moving distance of the mouse 5, and the content of the length 333 desired to be overwritten in process 714a is returned to process 709 as the amount of mouse movement.

  When the left button of the mouse 5 is released, the state of the mouse operation message queue is changed to the state in which the left button is released in processing 709. Therefore, the processing proceeds to processing 715, the processing sign 330 is turned off, and the processing returns to processing 709. 5 is determined.

  When the left button of the mouse 5 is double-clicked, the process proceeds to process 717 and the printed wiring pattern drawing process is terminated.

  Since the state of the mouse 5 can be examined at a sufficiently short time interval (for example, 0.01 seconds), the printed wiring pattern overwritten on the display 4 is drawn almost in synchronization with the operation of the mouse 5. Looks like. Similarly, the line length seems to be displayed synchronously.

  A detailed example of the process 714 will be described with reference to FIG.

  Attention is paid to the first branch of the first signal of the processing target signal name registered in the drawing state table 320 in the process 801. In step 802, the length of the line segment that has already been overwritten on the printed wiring pattern of the signal name of interest is calculated. At this time, the total value is obtained in consideration of the branch level of the processed length 312a of the target signal name in the pattern information table 300. In process 803, the length of the printed wiring pattern in which the signal of interest is not drawn is obtained. This can be calculated by calculating the total value of the remaining lengths 313a of the target signal names in the pattern information table 300 in consideration of the branch level, as in the case of determining the length of the overwritten line segment.

  In process 804, the position 324b of the section of the branch 324a currently being processed is extracted from the drawing state table 320. In process 805, the length to be overwritten, which is the amount of movement of the mouse, is obtained. This is obtained by subtracting the overwritten length 325 from the length 333 to be overwritten, and this result is stored in L.

  In process 806, the remaining length 313a of the target section is compared with the length L to be overwritten. If the remaining length 313a is large, the process proceeds to process 830 and the undrawn start position on the line segment of the target section (the section concerned) A line segment that is wide and high in luminance for the length to be overwritten is drawn on the overwriting layer 1100 from the position of the processed length 312a).

  Next, the remaining length 313a is updated in process 831 (remaining length 313a-L), the processed length 312a is updated in process 832 (processed length 312a + L), and the next signal in the drawing state table 320 or Focusing on the section of the same branch level, the process proceeds to process 834 to check whether there is still a signal to be processed. If there is still a signal to be processed, the process returns to step 802. If there are no more signals to be processed, the process proceeds to process 840 and the process is terminated.

If the remaining length 313a of the target section is equal to L in process 806, the process proceeds to process 820, and the remaining length 313a is drawn on the overwriting layer-1100, and the remaining length 313a is set to 0 in process 821a. Next, the processed length 312a is made the same as the individual section length 303 of the section.
Next, the process proceeds to a process 823 to check whether or not there is a section to be processed next. If a section to be processed remains, the process proceeds to a process 824 and the position 324 of the section being processed is updated to the position of the next section. Proceed to step 833.

  If the remaining length 313a is smaller than L in process 806, the process proceeds to process 810, and a wide and high-brightness line segment is drawn on the overwriting layer 1100 by the remaining length 313a of the target section, and the target section has been processed. The length 312a is made the same as the individual section length 303 of the section. Next, the process proceeds to process 812, the remaining length 313a is added to the overwritten line length 325, the remaining length 313a is subtracted from the remaining length 326 that can be rendered in process 813, and the remaining length 313a of the target section is set to 0 in process 814. To do.

  Next, the process proceeds to process 815 to check whether there is a next section to be processed with the same signal and the same branch level. If there is a next section, the process proceeds to process 816 and the position 324b of the section being processed is stored in the pattern information table 300. Update to the position of the next section. If there is no section to be processed, the process proceeds to process 833.

  With these processes, once the mouse and the drawing are related, the intended printed wiring pattern on the drawing can be processed only by the operation of the mouse, and the printed wiring pattern linked to the mouse operation can be drawn. it can.

  FIG. 13 shows an example in which the entire drawing layer 1050 and the overwriting drawing layer 1100 of the example in which only one signal name drawn in the processing of FIGS. Similarly, FIG. 14 shows an example in which a plurality of signals are designated and drawn simultaneously. FIG. 15 shows the drawing layer for the whole drawing at this time, and FIG. 16 shows only the printed wiring pattern of the signal name to be processed on the overwriting layer 1100 without displaying other figures and printed wiring pattern information. An embodiment in which the mouse 5 is overwritten by the operation of the mouse 5 is shown.

  In FIG. 17, only the printed wiring pattern of the signal name to be processed of the overwriting drawing layer 1100 is displayed, and the other graphics and printed wiring pattern information are not displayed, but overwritten halfway by the operation of the mouse 5. In this example, the movement amount is applied only to the X component of the printed circuit board printed wiring pattern.

  In addition, when it is desired to add a magnification difference between the moving amount of the mouse 5 and the moving amount of the drawing, the current position of the mouse 5 is obtained by processing 713 to obtain the difference in distance from the start position. The display magnification 341 in the drawing of FIG. 8 is changed by multiplying the obtained difference and adding this value to the length region 333 to be overwritten, and on the drawing displayed on the display 4 on the display 4. The amount of movement can be changed.

  FIG. 18 shows an example of a drawing target printed wiring pattern displayed on the overwriting drawing layer 1100, in which the moving amount of the mouse 5 is displayed with a length obtained by adding both the X and Y components of the printed wiring pattern. . Further, the signal propagation delay time of the printed wiring pattern is also obtained and displayed using the unit length signal propagation delay time 342 of FIG. This can be implemented by obtaining and displaying the signal propagation delay time based on the lengths obtained in the processes 832, 822, and 811 for obtaining the processed length of the processing flow.

  19, 20, and 21 show examples of the printed wiring pattern information table 300, the drawing state information table 320, and the printed wiring pattern when a printed wiring pattern having a branch is a processing target.

  FIG. 22 shows an embodiment in which the signal name is not indicated on the keyboard 6 but is indicated on the displayed drawing. In processing 1201, the coordinate system of the drawing and the coordinates of the mouse 5 are matched. Next, the processing proceeds to step 1202, and the mouse operation message queue is referenced. Here, if the left button of the mouse 5 is double-clicked, the process proceeds to processing 1204 and the coordinates of the position of the mouse cursor are captured. Next, a printed wiring pattern or a component pin whose coordinates taken in the processing 1205 match or are within a certain distance is searched and selected from the circuit connection information table 201 in FIG. 2 or the printed wiring pattern table 300 in FIG. At this time, if the target component pin or the printed wiring pattern is not found, the process proceeds to processing 1207 to try again. When a target component pin or printed wiring pattern is found, the signal name is registered in the signal name 321 of the drawing state table in FIG. If the right mouse button is clicked in step 1202, the process ends. If neither the right mouse button click nor the left button double click is selected, the process returns to step 1202.

  Since the signal name to be processed can be obtained by the processing so far, the subsequent processing is performed by the same processing as the processing after processing 706 in the embodiment of FIG.

  FIG. 23 shows an embodiment in which the processing target signal name and wiring length are indicated from the outside in FIG. 23, the processing target pattern is displayed as indicated, and the signal propagation delay time of the signal is displayed. The processing from the processing 701 to the processing 708 is the same as the processing in FIG. 11. The length to be displayed in the processing 1401 is input from the keyboard 6, set in the length area 333 to be overwritten, and then the length to be overwritten in the processing 1403. The line length is extracted from the area 333, the signal propagation delay time calculated from the signal propagation delay time 342 per unit length is displayed on the display 4, the printed wiring pattern is overwritten in processing 714, and the processing is terminated.

  FIG. 24 shows an embodiment in which a processing target signal name and a signal propagation delay time are given from the outside, a display length is calculated, and displayed on an existing printed wiring pattern. The processing from the processing 701 to the processing 708 is the same as the processing in FIG. 11, and the signal propagation delay time propagating on the printed wiring pattern is inputted from the keyboard 6 in the processing 1501, and the propagation distance per unit time is known in advance. Therefore, the overwriting length of the printed wiring pattern can be calculated. The length calculated in the process 1502 is set in the length area 333 to be overwritten. Next, the length calculated in the process 1503 is displayed on the display 4, the printed wiring pattern is overwritten in the process 714, and the process ends.

  The mounting position and the pin number are also stored in the printed wiring pattern information table so that the processing target signal name can be dealt with from the outside not by the signal name but by the mounting position name and the component pin number.

In this embodiment, a mouse is used as the printed wiring pattern length designation means. However, when a display means such as a touch panel or a touch display is used, the same processing can be performed by replacing the mouse with a touch pen or a finger. Can be implemented.

  When designing printed circuit boards and LSI wiring patterns, it can be expected to have a great effect in confirming the isometric length of wiring patterns and in checking the length of wires when taking noise countermeasures in a transmission line analyzer, and confirming the shortest route with a map display device. Therefore, the present invention can be used for an apparatus that collectively displays routes to places that can be reached within a certain time.

1 ... CPU (Central Processing Unit)
2 ... External memory 3 ... Internal memory (main storage device)
5 ... Mouse 201 ... Circuit connection information table 300 ... Printed wiring pattern information table 310 ... Component mounting position information table 315 ... Graphic drawing data table 320 ... Drawing state table 3300 ... Mouse state table 340 ... Drawing drawing basic information table 401 ... Point Species table 501 ... Interlayer distance table 1050 ... Overall drawing layer 1100 ... Overwrite drawing layer

Claims (5)

A printed wiring pattern display device in a CAD system for designing an electronic circuit,
The printed wiring pattern display device includes:
A CPU and a memory;
Display means for displaying one or more printed wiring patterns;
Designating means for designating an arbitrary printed wiring pattern from the one or more printed wiring patterns;
A printed wiring pattern length designating unit for designating a printed wiring pattern length for the printed wiring pattern designated by the designating unit,
The printed wiring pattern display device, wherein the printed wiring pattern length designated by the movement amount of the printed wiring pattern length designation means is displayed on the printed wiring pattern displayed on the display means. A printed wiring pattern display device in a CAD system for designing an electronic circuit,
The printed wiring pattern display device includes:
A CPU and a memory;
Display means for displaying one or more printed wiring patterns;
Designating means for designating an arbitrary printed wiring pattern from the one or more printed wiring patterns;
A signal propagation delay time designating unit for designating a signal propagation delay time for propagating the printed wiring pattern with respect to the printed wiring pattern designated by the designating unit;
The printed wiring pattern length is calculated from the signal propagation delay time given by the signal propagation delay time specifying means, and the calculated printed wiring pattern length is displayed on the printed wiring pattern displayed on the display means. Printed wiring pattern display device. A printed wiring pattern display device in a CAD system for designing an electronic circuit,
The printed wiring pattern display device includes:
A CPU and a memory;
Display means for displaying one or more printed wiring patterns;
Designating means for designating an arbitrary printed wiring pattern from the one or more printed wiring patterns;
A printed wiring pattern length designating unit for designating a printed wiring pattern length for the printed wiring pattern designated by the designating unit,
The printed wiring pattern length designated by the movement amount of the printed wiring pattern length designation means is displayed on the printed wiring pattern displayed on the display means, and the printed wiring pattern designated by the printed wiring pattern length designation means A printed wiring pattern display device that displays a signal propagation delay time of the length or the printed wiring pattern length in accordance with the display means. The printed wiring pattern length specifying means, a printed wiring pattern display apparatus as claimed in claim 1 or 3, wherein the mouse, it is a stylus or a touch display. A printed wiring pattern display device system in a CAD system for designing an electronic circuit,
The printed wiring pattern display device system includes:
A CPU and a memory;
Display means for displaying one or more printed wiring patterns;
Designating means for designating an arbitrary printed wiring pattern from the one or more printed wiring patterns;
Printed wiring pattern length specifying means for specifying a printed wiring pattern length for the printed wiring pattern specified by the specifying means;
A signal propagation delay time designating unit for designating a signal propagation delay time for propagating the printed wiring pattern with respect to the printed wiring pattern designated by the designating unit;
A length to be distinguished of the printed wiring pattern designated by the designation means is calculated from at least one of the movement amount of the printed wiring pattern length designation means and the signal propagation delay time designated by the signal propagation delay time designation means. And displaying the calculated length of the printed wiring pattern designated by the designation means on the printed wiring pattern designated by the designation means.

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