JP5807687B2 - Design support apparatus, design support method, and program - Google Patents

Description

  The present invention relates to a design support apparatus, a design support method, and a program for wiring a plurality of electronic components displayed on a display unit.

  In recent years, mounting design such as arrangement of electronic components or wiring arrangement on a printed circuit board or a ceramic substrate has been efficiently performed using a board design apparatus called Computer Aided Design (CAD). This board design apparatus automatically displays wiring for connecting pins of electronic parts called ratsnest if the net-defined electronic parts are sequentially arranged on the board displayed on the monitor. By automatically displaying the ratsnest, the designer can omit the troublesome work of wiring between electronic components. However, since there are a plurality of pins in the electronic component and the number of ratsnests connecting the pins of the electronic component is increased, there is a problem that visibility is lowered.

  Patent Document 1 discloses a device that displays rats nests connected between electronic components with line widths, colors, or shapes according to the number in order to make it easier to visually recognize a plurality of rats nests. According to Patent Document 1, it is possible to easily recognize the connection of electronic components even if all ratsnests are displayed on the screen.

JP 2003-345844 A

  However, even if the designer can grasp the connection between the components according to Patent Document 1, it cannot grasp whether the distance between the components to be wired is optimal. As a result, in Patent Document 1, there is a possibility that smooth mounting design cannot be performed.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a design support apparatus, a design support method, and a program capable of visually grasping the wiring distance between electronic components. is there.

The design support device disclosed in the present application corresponds to a storage unit that stores conditions relating to determination of a wiring distance when wiring to an electronic component, and corresponds to one electronic component among a plurality of electronic components displayed on the display unit, Based on the conditions stored in the storage unit, a wiring determination unit that determines wiring between the one electronic component and another electronic component to be connected to the one electronic component, and the wiring determination unit performs wiring. A wiring distance calculation unit that calculates a wiring distance between the determined one electronic component and the other electronic component, and according to the wiring distance calculated by the wiring distance calculation unit, the one electronic component and the A display form determining unit for determining a display form for information indicating connection with another electronic component, and a display form determined by the display form determining unit between the one electronic component and the other electronic component. Display control for displaying connection information on the display unit Provided with a door.

  According to one aspect of the design support apparatus disclosed in the present application, it is possible to visually grasp the wiring distance between electronic components.

It is a figure which shows an example of the display screen of the mounting design assistance apparatus which concerns on embodiment. It is a block diagram which shows the hardware constitutions of the mounting design assistance apparatus which concerns on embodiment. It is a block diagram which shows the function which a mounting design assistance apparatus has. It is a schematic diagram for demonstrating calculation of wiring distance. It is a schematic diagram for demonstrating the method of determining the display color of ratsnest. It is a schematic diagram for demonstrating the noise which arises in the wiring between electronic components. It is a figure which shows the waveform of the signal which a receiving side receives. It is a schematic diagram for demonstrating simulation analysis. It is a schematic diagram which shows the voltage waveform of the signal which a receiving side receives with the circuit of FIG. It is a flowchart which shows the procedure of the process which a mounting design assistance apparatus performs. It is a flowchart which shows the procedure of the process which a mounting design assistance apparatus performs.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a mounting design support apparatus, a mounting design support method, and a program according to the present invention will be described with reference to the drawings.

  The mounting design support apparatus according to the present embodiment is an apparatus for supporting mounting design such as arrangement of electronic components (for example, integrated circuit (IC)) or wiring arrangement on a printed circuit board or a ceramic substrate. Hereinafter, the mounting design support apparatus will be described as a general personal computer (hereinafter referred to as a personal computer) provided with a monitor, but may be a computer that is connected to an independent monitor without using a monitor. A computer dedicated to mounting design may be used, or a mobile phone or a personal digital assistant (PDA) may be used.

  FIG. 1 is a diagram illustrating an example of a display screen of the mounting design support apparatus according to the embodiment.

  On the screen of the mounting design support apparatus according to the present embodiment, an image 100 (hereinafter referred to as a substrate) corresponding to a printed circuit board or a ceramic substrate, and an image (hereinafter referred to as an electronic component) corresponding to an electronic component mounted on the printed circuit board or the like. 101, 102, 103, 104, 105 are displayed. The electronic components 101, 102, 103, 104, and 105 are moved by a designer's operation, and are arranged at a designer's desired position on the substrate 100.

  When an electronic component to be wired is specified by an operation by the designer, another electronic component to be connected to the electronic component is specified. In the present embodiment, it is assumed that electronic components 102, 103, and 104 are connected to electronic component 101. On the screen of the mounting design support apparatus, a straight line connecting the electronic components (hereinafter referred to as ratsnest) is displayed. Specifically, a ratsnest L1 that connects the electronic components 101 and 102, a ratsnest L2 that connects the electronic components 101 and 103, and a ratsnest L3 that connects the electronic components 101 and 104 are displayed. In FIG. 1, the ratsnests L1, L2, and L3 are indicated by dotted lines, but they may all be the same solid line or different types of lines.

  Rats nests L1, L2, and L3 are displayed with the number of wirings between electronic components to be connected, the line width according to the wiring distance, and the display color. The number of wirings is the number of signal lines that connect pins of electronic components to which the same signal is input and output. Rats nests L1, L2, and L3 are displayed with thick line widths as the number of wirings between electronic components increases. For example, the ratsnest L1 that connects the electronic components 101 and 102 is displayed thicker than the ratsnest L3 that connects the electronic components 101 and 104. This is because the number of wirings between the electronic components 101 and 102 is the electronic components 101 and 104. It is shown that there are more wirings in between.

  The wiring distance is a linear distance between electronic components or a Manhattan distance described later. When the wiring distance between the electronic components is long, the electronic component may be affected by transmission noise, and therefore a shorter one is preferable. Therefore, the ratsnests L1, L2, and L3 are displayed in red that gives a sense of danger or warning when the linear distance between the electronic components is long, and are displayed in blue that gives a sense of safety when the distance is short. Further, when the wiring distance between the electronic components is long and it is necessary to take noise countermeasures for the wiring between the electronic components, it is on the rats nest (rats nest L3 in FIG. 1) between the corresponding electronic components. A warning mark 106 is displayed.

  Thus, even if there are a plurality of wirings between the electronic components, the display is made with one ratsnest, so that the designer can easily grasp the connection relationship between the electronic components. The wiring strength between the electronic components is determined by the number of wirings between the electronic components. By changing the line width of the ratsnests L1, L2, and L3 according to the number of wirings, the designer visually It becomes easy to grasp the wiring strength. In addition, the designer can visually recognize the wiring distance between the electronic components based on the display color of the ratsnest, so if the ratsnest is red, the electronic components are placed optimally, such as bringing them closer together. It can be performed. Further, by displaying the warning mark 106, it is possible to prompt the designer to change the arrangement of the electronic components or to implement noise countermeasures so that the wiring distance between the electronic components becomes shorter.

  The electronic components 101, 102, 103, 104, and 105 can be moved by the designer's operation. When the display position is changed, the display color of the ratsnest is changed according to the wiring distance between the electronic components after the change. Is changed. As a result, the designer can perform optimal mounting design by moving each electronic component while visually checking the ratsnests L1, L2, and L3.

  Hereinafter, a specific configuration and operation of the mounting design support apparatus will be described in detail.

  FIG. 2 is a block diagram illustrating a hardware configuration of the mounting design support apparatus according to the embodiment.

  The mounting design support apparatus 1 includes hardware such as a central processing unit (CPU) 11, a read only memory (ROM) 12, a random access memory (RAM) 13, a hard disk drive (hereinafter referred to as HDD) 14, and an input / output unit 15. Each part is provided. These hardware units are connected to each other via a bus. The input / output unit 15 is an interface for connecting to a monitor 16, a mouse 17, a keyboard 18, and the like.

  The CPU 11 reads the program 12a stored in advance in the ROM 12 into the RAM 13 as appropriate and executes it, and controls the operation of each hardware unit described above. The ROM 12 stores a program 12a. The RAM 13 is, for example, a static RAM (SRAM), a dynamic RAM (DRAM), a flash memory, or the like. The RAM 13 temporarily stores various data generated when the CPU 11 executes the program 12a.

  The HDD 14 stores various necessary data and programs. The program 12a is installed in the HDD 14 by the recording medium 3 such as a Compact Disc-ROM (CD-ROM), Digital Versatile Disc-ROM (DVD-ROM), or Magneto-Optical disk (MO), or downloaded from the network. The form to be used may be used.

  Hereinafter, functions realized by the mounting design support apparatus 1 when the CPU 11 executes the program 12a will be described. FIG. 3 is a block diagram illustrating functions of the mounting design support apparatus 1. The mounting design support apparatus 1 includes an operation reception unit 20, a display unit 21, a component information storage unit 22, a wiring determination unit 23, a number counting unit 24, a line width determination unit 25, a wiring distance calculation unit 26, a wiring color determination unit 27, Functions such as a simulation execution determination unit 28 and a simulation execution unit 29 are provided.

  The operation accepting unit 20 accepts an operation by the designer via the mouse 17, for example, an operation such as selection or movement of the displayed electronic component. The display unit 21 displays the substrate 100 and the electronic components 101, 102, 103, 104, 105, ratsnests L 1, L 2, L 3, etc. on the monitor 16. The display unit 21 changes the display positions of the displayed electronic components 101, 102, 103, 104, and 105, the display colors of the ratsnests L1, L2, and L3 in accordance with the operation by the designer.

  The component information storage unit 22 stores component information related to electronic components displayed on the monitor 16 in advance. The component information includes characteristic information about the electronic component, information for specifying other electronic components connected to the electronic component, wiring contents between the electronic components such as which pin of the other electronic component is connected, and when wiring And the like.

  The wiring determination unit 23 determines wiring between electronic components. For example, in FIG. 1, when performing wiring for the electronic component 101, the wiring determination unit 23 acquires the component information of the electronic component 101 from the component information storage unit 22. Then, the wiring determination unit 23 specifies the electronic components 102, 103, and 104 to be connected to the electronic component 101 based on the component information, and determines the wiring that connects the electronic components. The number counting unit 24 counts (specifies) the number of wirings between electronic components based on the result of wiring performed by the wiring determination unit 23.

  The line width determining unit 25 determines the rats nest line width according to the number of wirings between the electronic components counted by the number counting unit 24. For example, the number of wires between the electronic components 101 and 102 is 10, the number of wires between the electronic components 101 and 103 is 8, and the number of wires between the electronic components 101 and 104 is 6. In this case, the line width determining unit 25 determines that the line width of the ratsnest L1 between the electronic components 101 and 102 having the largest number of wirings is 3 mm. The line width of the rats nest L2 between the electronic components 101 and 103 is determined as (3 mm / 10 pieces) × 8 pieces = 2.4 mm, and the line width of the rats nest L3 between the electronic components 101 and 104 is (3 mm / 10) × 6 = 1.8 mm. The display unit 21 displays the ratsnests L1, L2, and L3 with the line width determined by the line width determination unit 25.

  Note that the line width determination unit 25 does not determine the line width based on the wiring strength with respect to the entire substrate, but determines the line width for each electronic component to be processed. For example, in FIG. 1, when the electronic component 105 is connected to another electronic component other than the electronic component 101, the line width of the rats nest is the line width of the rats nest L 1, L 2, L 3 determined for the electronic component 101. Is determined independently.

  The wiring distance calculation unit 26 calculates a wiring distance between electronic components to be connected. FIG. 4 is a schematic diagram for explaining the calculation of the wiring distance. FIG. 4 shows a method of calculating the wiring distance between the electronic components A and B when the electronic component A and the electronic component B are connected. In FIG. 4, the horizontal direction on the paper is the x axis and the vertical direction on the paper is the y axis. The wiring distance calculation unit 26 acquires the coordinate positions of the electronic components A and B. At this time, the coordinate position of the center part of electronic parts A and B may be acquired, and the coordinate position of the pin of electronic parts A and B which connect the same signal line may be acquired. The wiring distance calculation unit 26 calculates the distance a in the x-axis direction and the distance b in the y-axis direction of the electronic components A and B. Then, the wiring distance calculation unit 26 calculates the Manhattan distance a + b obtained by adding the distance a and the distance b as the wiring distance. Alternatively, the wiring distance calculation unit 26 calculates the linear distance c between the electronic components A and B as the wiring distance. The wiring distance calculated by the wiring distance calculation unit 26 may be either the Manhattan distance a + b or the linear distance c.

  The wiring color determination unit 27 determines a display color of ratsnest based on the wiring distance calculated by the wiring distance calculation unit 26. More specifically, the wiring distance calculation unit 26 determines whether the wiring distance calculated by the wiring distance calculation unit 26 satisfies the constraint condition included in the component information. In the constraint condition, a wiring distance limit having a lower limit value (or upper limit value) calculated in consideration of noise and an upper limit value (or lower limit value) that is empirically derived by a designer, for example, considering a noise margin. The range is determined. The wiring color determination unit 27 determines the display color of the ratsnest depending on whether the wiring distance calculated by the wiring distance calculation unit 26 is within or outside the wiring distance limit range.

  FIG. 5 is a schematic diagram for explaining a method of determining the display color of ratsnest. FIG. 5 shows the relationship between the wiring distance calculated by the wiring distance calculation unit 26 and the ratsnest display color. When the wiring distance calculated by the wiring distance calculation unit 26 is less than the lower limit value of the restriction range, the wiring color determination unit 27 determines a blue display color. In addition, when the wiring distance calculated by the wiring distance calculation unit 26 exceeds the upper limit value of the restriction range, the wiring color determination unit 27 determines a red display color. When the wiring distance calculated by the wiring distance calculation unit 26 is within the limit range, the wiring color determination unit 27 regularly changes the RGB color density, and the blue color increases from the lower limit value to the upper limit value. The display color that becomes red is determined. For example, when the upper limit value of the limit range is 11 cm and the lower limit value is 8 cm, the wiring color determining unit 27 changes the RGB color density in six steps at intervals of 0.5 cm, and the wiring calculated by the wiring distance calculating unit 26 The display color corresponding to the distance is determined. The display unit 21 displays the ratsnest in the display color determined by the wiring color determination unit 27.

  The simulation execution determination unit 28 executes pre-determination processing for determining whether or not to execute simulation analysis. The simulation analysis is a process for determining whether or not noise countermeasures are necessary for wiring between electronic components. When the wiring distance calculated by the wiring distance calculation unit 26 exceeds the upper limit value of the limit range, that is, when the wiring color determination unit 27 determines a red display color, the electronic component may be affected by noise. Is expensive. Therefore, it is necessary to perform simulation analysis and determine whether or not noise countermeasures need to be taken for wiring between electronic components. However, when simulation analysis is executed, the processing time becomes long. Therefore, the simulation execution determination unit 28 executes the pre-determination process, so that unnecessary simulation analysis is not performed even when the wiring distance calculated by the wiring distance calculation unit 26 exceeds the upper limit value of the limit range. Can be. The prior determination process performed by the simulation execution determination unit 28 will be described in detail later.

  The simulation execution unit 29 executes simulation analysis according to the determination result of the simulation execution determination unit 28. When the simulation execution unit 29 executes the simulation analysis, it is determined whether or not to take noise countermeasures for the wiring between the electronic components. When the simulation execution unit 29 that has executed the simulation analysis determines that noise countermeasures are necessary, the display unit 21 displays a warning mark 106 (see FIG. 1). The simulation analysis will be described in detail later.

  Hereinafter, the prior determination process performed by the simulation execution determination unit 28 will be described in detail.

  FIG. 6 is a schematic diagram for explaining noise generated in wiring between electronic components. FIG. 6 shows a circuit in which an output resistor R1 of an electronic component on a signal transmission side (hereinafter simply referred to as a transmission side) and an input resistance R2 of an electronic component on a reception side (hereinafter simply referred to as a reception side) are connected. Yes. The reception side receives a signal in which noise is superimposed on the signal output from the transmission side. Specifically, the signal A output from the transmission side passes through the impedance (not shown) on the line and the input resistance R2 on the reception side. At this time, the signal is reflected due to the difference in impedance and the size of the input resistance R2, and a reflected wave B is generated from the reception side toward the transmission side. Similarly, the reflected wave C is generated from the transmission side to the reception side due to the impedance on the line and the output resistance R1. This reflection is repeatedly performed, and the signal output from the transmission side is distorted due to the reflected wave.

  FIG. 7 is a diagram illustrating a waveform of a signal received by the receiving side. In the figure, the horizontal axis represents elapsed time [ns], and the vertical axis represents signal voltage [V]. VOH in the figure is the lowest voltage value for the receiving side to perform a stable operation, and the receiving side has received a signal of a voltage higher than VOH, so that it has received a High signal, and the stable operation. To start. Every time the receiving side receives a reflected wave, the signal transmitted from the transmitting side is distorted. The reflected wave converges over time. Therefore, when the first reflected wave is superimposed after the voltage reaches VOH or higher, the synthesized signal waveform has a longer time until it settles to a value higher than VOH, and the peak voltage value may exceed the allowable value. . The first reflected wave is a signal (reflected waves B and C in FIG. 6) reflected from the reception side to the transmission side and further reflected from the transmission side to the reception side.

  Therefore, the simulation execution determination unit 28 calculates the line length (allowable upper limit value) d between the resistors R1 and R2 at which the receiving side can receive the first reflected wave before the time when the voltage reaches VOH or higher (rise time). When the wiring distance calculated by the wiring distance calculation unit 26 is longer than the line length d, the simulation execution determination unit 28 determines that there is a high possibility that the influence of noise will be exerted on the reception side. In this case, the simulation execution determination unit 28 needs to consider the transmission noise in more detail, that is, the simulation execution determination unit 28 determines to execute the simulation analysis. When there are a plurality of wirings between the electronic components, the simulation execution determination unit 28 calculates the line length d for each wiring and determines whether to execute the simulation analysis.

  For example, the speed at which the signal propagates on the line is obtained from the line constant, and is usually about 7 ns / m when a glass epoxy material is used as the substrate material. In this case, the time T1 required for the signal to reciprocate between the resistors R1 and R2 is (2 × d) × 7 ns / m. On the other hand, since the rise time T2 of the high-speed gate signal is about 1.5 ns, the line length d at which the times T1 and T2 are the same is 1.5 ns / (2 × 7 ns / m) = 11 cm. When the line length d is greater than 11 cm, the time T1 is longer than the time T2, and the receiving side can receive the first reflected wave before the rise time. On the other hand, when the line length d is 11 cm or less, the time T1 is shorter than the time T2, and the receiving side receives the first reflected wave after the rising time.

  That is, when the signal propagation time is Vo (ns / m), the signal rise (fall) time is Trf (ns), and the line length is d (m), the simulation execution determination unit 28 When the line length d ≦ Trf / (2 × Vo), it is determined that transmission noise is not considered. On the other hand, when the line length d> Trf / (2 × Vo), the simulation execution determination unit 28 determines to execute the simulation analysis because it is necessary to examine transmission noise in more detail.

  Next, simulation analysis performed by the simulation execution unit 29 will be described in detail.

  FIG. 8 is a schematic diagram for explaining the simulation analysis. FIG. 8 is a circuit in which the output resistance R1 on the transmission side and the input resistance R2 on the reception side are connected, as in FIG. 6, and further shows the characteristic impedance Z0 on the connection line. In FIG. 8, the time for the signal to propagate between the resistors R1 and R2 is time τ.

  When the transmitting side outputs a signal having a voltage of amplitude V0, the signal reaches the receiving side after time τ, and a reflected wave of a voltage of amplitude Vr1 is generated due to mismatch between the characteristic impedance Z0 and the input resistance R2 on the receiving side. . This reflected wave is propagated again to the transmission side, and a reflected wave having a voltage of Vr2 is generated due to impedance mismatch on the transmission side. Further, this reflected wave generates a reflected wave having a voltage of Vr3 on the receiving side. Here, the relationship among the output resistance R1, the characteristic impedance Z0, and the input resistance R2 is R1 << Z0, R2 >> Z0. Due to this relationship, transmission noise input to the receiving side tends to converge with time.

  FIG. 9 is a schematic diagram showing a voltage waveform of a signal received by the receiving side in the circuit of FIG. In the figure, the horizontal axis represents elapsed time [ns], the vertical axis represents signal voltage [V], and shows voltage values at times τ, 3τ, 5τ, 7τ, and 9τ. In the figure, VOH is the lowest voltage value for the receiving side to perform a stable operation, and SOH is the highest voltage value that can be received by the receiving side. The receiving side is destroyed or malfunctions by receiving a signal having a voltage higher than SOH. As shown in FIG. 9, when the voltage value V (τ) when the signal output from the transmission side reaches the reception side becomes the maximum voltage input to the reception side, and the reflected wave returns to the reception side again. The voltage value V (3τ) is the minimum voltage. V (τ) and V (3τ) can be calculated as follows.

  The simulation execution unit 29 determines whether the calculated V (τ) is SOH or less and V (3τ) is VOH or more. When V (τ) is not more than SOH and V (3τ) is not less than VOH, the simulation executing unit 29 determines that a transmission noise countermeasure is required for the determined wiring.

  Hereinafter, the operation of the mounting design support apparatus 1 will be described in detail. FIG. 10 and FIG. 11 are flowcharts showing a procedure of processing executed by the mounting design support apparatus 1. The processing shown in FIGS. 10 and 11 is executed by the CPU 11.

  The CPU 11 determines an image and display position of an electronic component or the like to be displayed on the monitor (S1), and displays an image corresponding to the determined position (S2). Next, the CPU 11 acquires component information of the displayed one electronic component (for example, the electronic component 101) (S3), and selects other electronic components (for example, the electronic components 102, 103, 104) connected to the one electronic component. The wirings that identify and connect the respective electronic components are determined (S4).

  Next, the CPU 11 counts the determined number of wirings between the electronic components (S5), and determines the ratsnest line width based on the counting result (S6). Specifically, the CPU 11 increases the line width as the number of wires increases, and decreases the line width as the number of lines decreases. CPU11 calculates the wiring distance between electronic components (S7). As described above, the wiring distance may be a Manhattan distance or a linear distance between electronic components.

  The CPU 11 determines the display color of the ratsnest based on the constraint condition included in the component information acquired in S3 and the wiring distance calculated in S7 (S8). For example, the CPU 11 determines a blue display color when the calculated wiring distance is less than the lower limit value of the restriction range included in the restriction condition. In addition, when the calculated wiring distance exceeds the upper limit value of the limit range, the CPU 11 determines a red display color. Further, when the wiring color is within the limit range, the CPU 11 regularly changes the RGB color density and determines a display color that changes from blue to red as the wiring color approaches the upper limit value from the lower limit value. Thereafter, the CPU 11 displays a ratsnest that connects the electronic components with the line width determined in S6 and the display color determined in S8 (S9).

  Next, the CPU 11 determines whether or not the wiring distance calculated in S7 is equal to or greater than the upper limit value of the restriction range included in the restriction condition (S10). When the wiring distance is not equal to or greater than the upper limit value (S10: NO), the CPU 11 determines that noise countermeasures are not necessary for the wiring between the electronic components connected by the ratsnest, and the process proceeds to S17. When the wiring distance is equal to or greater than the upper limit value (S10: YES), the CPU 11 executes a pre-determination process (S11). In the pre-determination process, it is determined whether or not to execute simulation analysis. Specifically, as described above, the CPU 11 calculates the line length d of one wiring that connects the electronic components, and determines whether or not the wiring distance calculated in S7 exceeds the line length d. When it exceeds, CPU11 determines with performing a simulation analysis.

  The CPU 11 determines whether or not to execute simulation analysis as a result of the prior determination process (S12). When it determines with not performing a simulation analysis (S12: NO), CPU11 moves to the process of S16. When it determines with performing a simulation analysis (S12: YES), CPU11 performs a simulation analysis (S13). In the simulation analysis, the CPU 11 calculates the maximum and minimum voltage values of the signal received on the receiving side, and determines whether the maximum voltage value is equal to or lower than the SOH on the receiving side and the minimum voltage value is equal to or higher than VOH. The CPU 11 determines that countermeasures against noise are necessary when the maximum voltage value is SOH or less and the minimum voltage value is VOH or more.

  As a result of the simulation analysis, the CPU 11 determines whether noise countermeasures are necessary (S14). When it is determined that noise countermeasures are necessary (S14: YES), the CPU 11 displays a warning mark 106 on the corresponding ratsnest (S15). When it is determined that noise countermeasures are not necessary (S14: NO), or after a warning mark is displayed, the CPU 11 completes processing such as pre-determination processing for all wiring between electronic components that are processing targets. It is determined whether or not (S16). When the process for all the wirings has not been completed (S16: NO), the CPU 11 returns to the process of S11 and executes a pre-determination process for other wirings connecting the electronic components. When repeating S11 to S16 and the warning mark is already displayed, the CPU 11 omits the process of S15. When the process for all the wirings is completed (S16: YES), the CPU 11 executes the process of S17.

  The CPU 11 determines whether or not ratsnest is displayed for all the other electronic components wired to the one electronic component in S4 (S17). For example, in the case of FIG. 1, the electronic component 101 is wired with the electronic components 102, 103, and 104, respectively. Then, after displaying the ratsnest L1 between the electronic components 101 and 102, the CPU 11 determines whether or not the ratsnest between the electronic components 101 and 103 and between the electronic components 101 and 104 is displayed. When not displaying all ratsnest (S17: NO), CPU11 returns to the process of S5 and performs the same process about the combination of another electronic component. When all the rats nests are displayed (S17: YES), the CPU 11 ends this process.

  When the movement operation of the displayed electronic component is received, the CPU 11 executes the processing from S7 to S16 to determine the display color of the ratsnest for the moved electronic component, and the preliminary determination process and the simulation analysis Etc.

  As described above, in this embodiment, even if there are a plurality of wirings between electronic components, a single ratsnest display allows the designer to easily understand the connection relationship between the electronic components. . Also, by determining the line width of the ratsnest according to the number of wirings between the electronic components, the designer can easily grasp the wiring strength between the electronic components visually. Furthermore, the designer can visually recognize the wiring distance between the electronic components by the display color of the ratsnest. As a result, the designer can optimally arrange the electronic components such as bringing the electronic components close to each other when the ratsnest is red, for example. Further, by displaying the warning mark 106, it is possible to prompt the designer to change the arrangement of the electronic components or to implement noise countermeasures so that the wiring distance between the electronic components becomes shorter. As described above, the designer can optimally arrange the electronic components, and can perform a smooth mounting design.

  The preferred embodiment of the present invention has been specifically described above, but each configuration, operation, and the like can be changed as appropriate, and are not limited to the above-described embodiment.

  Hereinafter, additional notes will be disclosed regarding the embodiment including the above-described embodiment.

(Appendix 1)
A storage unit for storing constraints when wiring to an electronic component displayed on the display unit;
Based on the constraint condition read from the storage unit corresponding to one electronic component among the plurality of electronic components displayed on the display unit, the one electronic component and the other to be connected to the one electronic component A wiring determination unit for determining wiring with the electronic component of
A wiring distance calculation unit that calculates a wiring distance between the one and other electronic components for which the wiring determination unit has determined the wiring;
A display form determining unit for determining a display form based on the wiring distance calculated by the wiring distance calculating unit and the constraint condition;
A mounting design support apparatus comprising: a display control unit configured to display a straight line connecting the one and other electronic components on the display unit in the display mode determined by the display mode determining unit.

(Appendix 2)
The display form determination unit
The mounting design support device according to claim 1, wherein a display color is determined based on the wiring distance calculated by the wiring distance calculation unit and the constraint condition.

(Appendix 3)
A position changing unit for changing the position of the electronic component displayed on the display unit;
The wiring distance calculation unit
The mounting design support apparatus according to claim 1 or 2, wherein a wiring distance is calculated each time the position changing unit changes the position of the one or other electronic component.

(Appendix 4)
The storage unit
The characteristic information of electronic parts is stored,
Based on the characteristic information corresponding to the one and other electronic components stored in the storage unit, an upper limit value calculating unit that calculates an allowable upper limit value of the wiring distance between the one and other electronic components;
A determination unit that determines whether the wiring distance calculated by the wiring distance calculation unit exceeds an allowable upper limit value calculated by the upper limit value calculation unit;
An execution unit that executes a process of determining whether or not noise countermeasures are necessary for the wiring between the one and other electronic components when it is determined that the determination unit has exceeded,
The display control unit
As a result of executing the processing by the execution unit, when it is determined that noise countermeasures are necessary, a warning image is displayed together with the straight line. .

(Appendix 5)
The wiring distance calculation unit
The mounting design support apparatus according to any one of appendices 1 to 4, wherein a Manhattan distance between the one and other electronic components is calculated.

(Appendix 6)
A storage unit for storing constraints when wiring to an electronic component displayed on the display unit;
Based on the constraints read from the storage unit corresponding to one electronic component among the plurality of electronic components displayed on the display unit, the one electronic component and the other electronic component to be connected to the one electronic component A wiring determination unit for determining wiring with the electronic component of
A specifying unit for specifying the number of wirings between the one and other electronic components for which the wiring determining unit has determined wiring;
A display form determining unit for determining a display form based on the number of wirings specified by the specifying unit;
A mounting design support apparatus comprising: a display control unit that displays lines connecting the one and other electronic components in a display mode determined by the display mode determination unit.

(Appendix 7)
The display form determination unit
The mounting design support apparatus according to claim 6, wherein a line width to be displayed is determined according to the number of wirings specified by the specifying unit.

(Appendix 8)
Based on constraint conditions corresponding to one electronic component among the plurality of electronic components displayed on the display unit, stored in a storage unit that stores constraint conditions when wiring to the electronic component displayed on the display unit Determining wiring between the one electronic component and the other electronic component to be connected to the one electronic component,
Calculate the wiring distance between the one and other electronic components that determined the wiring,
Based on the calculated wiring distance and the constraint condition, determine the display form,
A mounting design support method for displaying a straight line connecting the one and the other electronic components on the display unit in the determined display form.

(Appendix 9)
Based on constraint conditions corresponding to one electronic component among the plurality of electronic components displayed on the display unit, stored in a storage unit that stores constraint conditions when wiring to the electronic component displayed on the display unit Determining wiring between the one electronic component and the other electronic component to be connected to the one electronic component,
Identify the number of wires between the one and other electronic components that have determined the wiring,
Based on the number of wires specified, the display form is determined,
A mounting design support method for displaying a line connecting the one and other electronic components in the determined display form.

(Appendix 10)
In a program executed by a computer that stores constraints when wiring to an electronic component displayed on the display unit,
Computer
Based on the constraint condition read from the storage unit corresponding to one electronic component among the plurality of electronic components displayed on the display unit, the one electronic component and the other to be connected to the one electronic component Wiring determination unit for determining wiring with electronic components of
A wiring distance calculating unit that calculates a wiring distance between the one and other electronic components for which the wiring determining unit has determined the wiring;
A display form determining unit that determines a display form based on the wiring distance calculated by the wiring distance calculating unit and the constraint condition; and
A program that functions as a display control unit that displays a straight line connecting the one and other electronic components on the display unit in the display mode determined by the display mode determining unit.

(Appendix 11)
In a program executed by a computer that stores constraints when wiring to an electronic component displayed on the display unit,
Computer
Based on the constraint condition read from the storage unit corresponding to one electronic component among the plurality of electronic components displayed on the display unit, the one electronic component and the other to be connected to the one electronic component Wiring determination unit for determining wiring with electronic components of
A specifying unit for specifying the number of wirings between the one and other electronic components for which the wiring determining unit has determined the wiring;
A display form determining unit for determining a display form based on the number of wirings specified by the specifying unit; and
A program that functions as a display control unit that displays a straight line connecting the one and other electronic components in the display mode determined by the display mode determination unit.

(Appendix 12)
A recording medium on which the program described in Appendix 11 is recorded and can be read by a computer.

(Appendix 13)
A recording medium on which the program described in Appendix 12 is recorded and is readable by a computer.

20 Operation reception part (position change part)
21 Display unit (display control unit)
22 Parts information storage unit (storage unit)
23 Wiring determination unit (wiring determination unit)
24 number counting part (specific part)
25 Line width determination part (display form determination part)
26 Wiring distance calculation unit 27 Wiring color determination unit (display form determination unit)
28 Simulation execution determination part 29 Simulation execution part

Claims (7)

A storage unit for storing conditions relating to wiring distance determination when wiring to an electronic component;
Based on the condition stored in the storage unit corresponding to one of the plurality of electronic components displayed on the display unit, the one electronic component and the one electronic component should be connected A wiring determining unit that determines wiring with other electronic components;
A wiring distance calculation unit that calculates a wiring distance between the one electronic component and the other electronic component for which the wiring determination unit has determined the wiring;
A display form determination unit for determining a display form for information indicating connection between the one electronic component and the other electronic component according to the wiring distance calculated by the wiring distance calculation unit;
A design support apparatus comprising: a display control unit configured to display information indicating a connection between the one electronic component and the other electronic component in the display mode determined by the display mode determination unit. The display form determination unit
The design support apparatus according to claim 1, wherein a display color is determined according to the wiring distance calculated by the wiring distance calculation unit. A position changing unit for changing the position of the electronic component displayed on the display unit;
The wiring distance calculation unit
The design support apparatus according to claim 1 or 2, wherein a wiring distance is calculated each time the position changing unit changes the position of the one or other electronic component. The storage unit
The characteristic information of electronic parts is stored,
Based on characteristic information corresponding to the one electronic component and the other electronic component stored in the storage unit, an allowable upper limit value of a wiring distance between the one electronic component and the other electronic component An upper limit calculation unit for calculating
A determination unit that determines whether the wiring distance calculated by the wiring distance calculation unit exceeds the allowable upper limit value calculated by the upper limit value calculation unit;
An execution unit that executes a process of determining whether or not a noise countermeasure is necessary for the wiring between the one electronic component and the other electronic component when it is determined that the determination unit has exceeded ,
The display control unit
The design support apparatus according to any one of claims 1 to 3, wherein a warning image is displayed together with the information when it is determined that noise countermeasures are necessary as a result of execution of the execution unit.   A reception unit that receives an operation of moving the electronic component displayed on the display unit;
  The position changing unit changes the position of the electronic component displayed on the display unit according to the operation received by the receiving unit.
  The design support apparatus according to claim 3. Design support device
Based on the condition corresponding to one electronic component among the plurality of electronic components displayed on the display unit, which is stored in the storage unit that stores the condition relating to the determination of the wiring distance when wiring to the electronic component, the one Determining the wiring between the electronic component and the other electronic component to be connected to the one electronic component,
Calculating the wiring distance between the determined the wiring as one of the electronic component and the other electronic components,
In accordance with the calculated wiring distance, a display mode for information indicating connection between the one electronic component and the other electronic component is determined,
A design support method for displaying, on the display unit, information indicating a connection between the one electronic component and the other electronic component in the determined display form. In a program executed by a computer that stores conditions when wiring to an electronic component,
Computer
Based on the condition corresponding to one electronic component among the plurality of electronic components displayed on the display unit, which is stored in the storage unit that stores the condition relating to the determination of the wiring distance when wiring to the electronic component, the one A wiring determining unit that determines wiring between the electronic component and the other electronic component to be connected to the one electronic component;
A wiring distance calculation unit that calculates a wiring distance between the one electronic component and the other electronic component for which the wiring determination unit has determined the wiring;
A display mode determination unit that determines a display mode for information indicating the connection between the one electronic component and the other electronic component according to the wiring distance calculated by the wiring distance calculation unit; and
A program that functions as a display control unit that displays information indicating a connection between the one electronic component and the other electronic component in the display mode determined by the display mode determining unit.

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