JP2853644B2 - Printed wiring board design equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board designing apparatus, and more particularly to a printed wiring board designing apparatus suitable for designing a printed wiring board for surface mounting.

[0002]

2. Description of the Related Art Conventionally, in designing a printed wiring board on which surface-mounted components are mounted, wiring has been performed in consideration of wiring remodeling after the mounting of the components, as disclosed in, for example, Japanese Patent Application Laid-Open No. 4-111075. FIG. 4 is a block diagram showing the configuration of this conventional example.

[0003] The logical connection information 34 of the circuit diagram, the component arrangement coordinate value 32 for setting the component arrangement position, and the component library 33 for defining the position of the pad and land of the component for each component.
, A component mounting pad expanding unit 2 for expanding pads and lands on a wiring area map based on the input information, and a logical connection information in addition to a land and pad position for a pin pair to be wired. 34, a pin pair determining means 3 for determining a pin pair, and determining whether or not one of the pins of the wiring pin pair determined by the pin pair determining means 3 is connected to a surface mounting component, and Connection state determining means 4A for determining whether the connection is on the power or ground side when the component is connected, and when the pin is connected on the power or ground side if connected to a surface mount component And a signal pattern setting means 5A for setting a signal pattern so as to be drawn out from the inside of the component mounting pad.

The signal pattern setting means 5A is set so that when one of the pins connected to the surface mount component is not connected to the power supply or the ground side, the signal pattern is drawn out of the component mounting pad. Means to
A wiring means for determining whether or not the wiring processing for the two pins of the wiring pin pair is completed, and sending a wiring processing completion notification to the wiring means 6 when the wiring processing is completed; 6 and a wiring data output means 7 for outputting wiring data of the wiring pattern to the external file 10 when it is determined that wiring has been completed.

FIG. 5 is a flowchart showing the flow of the operation of FIG. First, logical connection information such as a circuit diagram is input in the form of a netlist or the like (process S1A). Next, the coordinates of the component arrangement to be mounted on the printed wiring board are input (process S
2). A component library in which the positions of the pads and lands of the components are defined for each component is input, and the pads and lands are developed on the wiring area map (process S3). The pin pair to be wired next is determined from the logical connection information input in step S1A and the land and pad positions (step S4).

It is checked whether or not one of the pins of the wiring pin pair determined in step S4 is connected to a surface mount component (step S5A). If this is connected to the surface mount component, it is checked whether or not the pin is a power / GND (ground) signal (process S6A). If it is a power / GND signal, the signal pattern is drawn from inside the component mounting pad. Via holes (through holes) are provided (process S7)
A). If it is a signal line, a signal pattern is drawn out of the component mounting pad and a via hole is provided (process S8A).

Next, it is checked whether or not the processing from processing S5A to processing S8A has been completed for the two pins to be wired (processing S9A). If not completed, the process returns to processing S5A, and if completed, processing returns to processing S5A. The wiring process is performed using the via hole or land generated in S5A to S8A as a routing target (process S10A). It is checked whether or not processing has been performed for all pin pairs (processing S
11) If the process has not been performed, return to process S5A,
If the processing has been performed, the wiring data of the wiring pattern is output to an external file (processing S12).

FIG. 6 is a layout diagram showing a variation of the circuit pattern connected according to FIG. A part library 33 in which the positions of the pads and lands of the parts are defined is input, and the state where the pads and lands are developed on the wiring area map is referred to as a pad 11. The pads 11 include a signal pad 19, a power supply pad 20, and a ground pad 21, and a component outer shape 13 is provided outside these pads. Also,
A via hole 18 is provided inside the component outer shape 13, and a wiring pattern 17 is connected between the component outer shape 13 and another component outer shape 13 ′.

[0009]

In the above-mentioned prior art, the drawing direction of the pattern is determined by the logical attribute of the power supply / ground or the signal line. In this case, the number of the signal patterns (17) to be drawn out of the component pads (11) is far larger than the number of the power / ground patterns drawn to the inside of the component pads. There is a problem that the wiring patterns concentrate on the outside of the substrate and unconnected wiring patterns are generated.

In the prior art, a signal pattern is drawn to the outside of the component pad to the via hole 18. However, since the attribute of prohibiting the movement of the wiring is not set, the signal pattern is erroneously moved inward of the component pad when the wiring is changed. There is a problem that a special jig for removing the component by pattern cutting for remodeling is required for the modification, or the board becomes unusable due to an accident such as peeling of a copper foil pad.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem and to prevent the occurrence of an unconnected wiring pattern by determining the pattern drawing direction from logical connection information having the attribute of wiring modification, and to modify the wiring. By setting the attribute of prohibition of wiring movement from the pin to the virtual terminal, the wiring pattern is prevented from being mistakenly pulled out to the inside of the component pad when changing the wiring, and the modification performed after wiring can be eliminated. It is an object of the present invention to provide a printed wiring board design apparatus capable of performing the above.

[0012]

According to the present invention, there is provided an input means for inputting a component arrangement coordinate value for determining a component arrangement position and a component library for defining a position of a pad and a land for each component. Component mounting pad expanding means for expanding the pads and lands on a wiring area map based on input information from the input means, pin pair determining means for determining pin pairs to be wired based on the positions of the lands and pads, Wiring means for performing wiring based on the pin pair determined by the means and determining completion of all wiring processing, and wiring data output means for outputting wiring data of the wiring pattern to an external file when the determination of the wiring end is received In the printed wiring board designing apparatus, the input means has a logical connection information having an attribute of remodeling a circuit diagram. Means for determining the pin pair by adding the logical connection information in addition to the land and pad positions to the pin pair determining means, and determining the pin pair from the wiring pin pairs determined by the pin pair determining means. Connection determination means for determining whether one of the attributes is the attribute of the wiring modification, and drawing a pattern from the pin having the attribute of the wiring modification outside the outer shape of the component, so that the extracted end point becomes a virtual terminal. And means for setting the drawer pattern to be prohibited from moving.

In the present invention, the drawing pattern setting and movement prohibition setting means determines whether or not the wiring processing has been completed for all the pins of the wiring pin pair. To the wiring means.

According to the structure of the present invention, since the pattern drawing direction is determined by the logical connection information having the attribute of wiring modification, it is possible to prevent the occurrence of an unconnected wiring pattern. Further, since the attribute of prohibiting the movement of the wiring is set for the drawing pattern from the pin to the virtual terminal of the wiring modification, the modification performed after the wiring can be eliminated.

[0015]

Next, an embodiment of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention. In this embodiment, an input unit 1 for inputting a component arrangement coordinate value 32 for setting a component arrangement position and a component library 33 for defining a position of a pad and a land for each component, and a pad based on the input information. And a component mounting pad developing means 2 for developing a land and a land on a wiring area map, a pin pair determining means 3 for determining a pin pair to be wired based on the position of the land and the pad, and performing wiring based on the determined pin pair. Wiring means 6 for determining the end of the wiring process, and wiring data output means 7 for outputting wiring data of the wiring pattern to the external file 10 when the determination of the wiring end is received.

Furthermore, as a feature of the present invention, the input means 1
The logical connection information 31 having the attribute of wiring modification of the circuit diagram
And a means for adding the logical connection information 31 having the attribute of wiring modification to the pin pair determining means 3 in addition to the land and pad position to the pin pair determining means 3 to determine the pin pair. The wiring determined by the pin pair determining means 3 A connection determining means for determining whether or not one of the pin pairs has a wiring modification attribute; and extracting a pattern from a pin having the wiring modification attribute to the outside of the component outer shape so that the terminal is a virtual terminal. The drawing pattern is provided with means 5 for setting the attribute of prohibition of movement, and it is determined whether or not the wiring processing has been completed for all the pins of the wiring pin pair. Means for sending to the user.

Next, the operation of the present embodiment configured as described above will be described with reference to a flowchart showing the flow of the operation of the embodiment of FIG. First, when logical connection information such as a circuit diagram is input in the form of a netlist or the like, an attribute is provided to a pin whose wiring is expected to be modified in a pin pair in the circuit diagram and input (process S1). Next, a component arrangement coordinate value 32 to be mounted on the printed wiring board is input (process S2). The part library 33 defining the positions of the pads and lands of the parts is input for each part, and the pads and lands are developed on the wiring area map (process S3). Next, the logical connection 3 having the attribute of the wiring modification in which the pin pair to be wired is input in the processing S1.
1 and land and pad positions (process S
4).

It is checked whether or not one of the wiring pin pairs determined in the process S4 has a wiring modification attribute (process S4).
5). In this case, a pattern cutting jig is used for wiring modification. For example, a pattern is drawn outward from the outer shape of the component by the length of the blade edge width of the cutter. In this embodiment, it is 3 mm. If it has the attribute of wiring modification, it is 3m from the external shape of the pin having the attribute of wiring modification.
The area 14 is provided outside the area m (process S6). A pattern is drawn from the pin 12 having the attribute of wiring modification to a boundary 3 mm outside of the external shape of the component, and the terminal is provided to be the virtual terminal 15 (step S7). The movement prohibition attribute is set to the drawer pattern (step S8).

Next, it is checked whether or not the processing of steps S5 to S8 has been completed for all the pins to be wired (processing S9). If not completed, the process returns to step S5. The wiring process is performed using the virtual terminal generated in S5 to S8 or a pad or land other than the virtual terminal as a routing target (process S10). It is checked whether or not processing has been performed for all pin pairs (processing S
11) If the process has not been performed, the process returns to the process S5. If the process has been performed, the wiring data of the wiring pattern is output to the external file 10 (process S12).

FIG. 3 is a layout diagram showing an example of a pattern connected by such an operation. In the figure, a part library (33) in which the positions of the pads and lands of the parts are defined is input, and the state where the pads and lands are developed on the wiring area map is referred to as a pad 11. Here, a component pin 12 having a wiring modification attribute is included. 3 mm from the component outer shape 13 of the component pin 12 having the attribute of the wiring modification
The wiring area 14 is provided outside. A lead pattern 16 is provided from the component pin 12 having the attribute of wiring modification to a boundary outside the component outer shape 13, and the terminal thereof is connected to the virtual terminal 15.
And A wiring pattern 17 in which the virtual terminal 15 or a pad other than the virtual terminal is wired as a routing target and a via hole 18 are provided.

According to the present embodiment, since the pattern drawing direction is determined by the logical connection information having the attribute of wiring modification, it is possible to prevent the occurrence of an unconnected wiring pattern. In addition, since the attribute of prohibition of the movement of the wiring is set for the lead pattern from the pin having the wiring resolution to the virtual terminal, the modification performed after the wiring can be eliminated.

[0022]

As described above, according to the present invention, in a printed wiring board designing apparatus, an unconnected wiring pattern is generated by determining a pattern lead-out direction based on logical connection information having an attribute of wiring modification. In addition, by setting the attribute of the wiring movement prohibition for the drawing pattern from the pin to the virtual terminal of the wiring modification, it is possible to prevent the wiring pattern from being accidentally drawn inside the component pad when making the wiring change In addition, modification performed after wiring can be eliminated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of the operation of FIG.

FIG. 3 is a layout diagram illustrating an example of a pattern connected according to FIG. 1;

FIG. 4 is a block diagram showing a configuration of a conventional printed wiring board designing apparatus.

FIG. 5 is a flowchart showing a flow of the operation of FIG. 4;

FIG. 6 is a layout diagram showing an example of a pattern connected according to FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 input means 2 component mounting pad expanding means 3 pin pair determining means 4 connection determining means 4A connection state determining means 5 drawing pattern setting and movement inhibition setting means 5B signal pattern setting means 6 wiring means 7 wiring data output means 10 external file 11 pad 12 Component Pins with Attributes of Wiring Modification 13 Component Outline 14 Wiring Area 15 Virtual Terminal 16 Lead Pattern 17 Wiring Pattern 18 Via Hole 19 Signal Component Mounting Pad 20 Power Supply Component Mounting Pad 21 GND Component Mounting Pad 31 Attributes of Wiring Modification Logical connection information 32 Component arrangement coordinate value 33 Parts library 34 Logical connection information

Claims (3)

(57) [Claims] 1. A part arrangement coordinate value for setting a part arrangement position and a part library for defining a position of a pad and a land of a part for each part are inputted, and pads and lands are placed on a wiring area map based on the input information. In a printed wiring board design apparatus which determines a pin pair to be wired based on the positions of the lands and pads, and performs wiring based on the determined pin pair, a logic having a wiring modification attribute of a circuit diagram as the input. Inputting connection information, adding a logical connection information having the attribute of the wiring modification in addition to the land and pad positions to determine a pin pair, and determining whether one of the wiring pin pairs includes the attribute of the wiring modification. For example, a pattern is drawn out of the external shape of the component from a pin having the attribute of the wiring modification, and the end point of the pattern is set as a virtual terminal. A printed wiring board designing apparatus, wherein a drawing pattern is designed. 2. An input unit for inputting a component arrangement coordinate value for determining a component arrangement position and a component library for defining a position of a pad and a land of a component for each component, and the input unit based on input information from the input unit. Component mounting pad developing means for developing pads and lands on a wiring area map; pin pair determining means for determining pin pairs to be wired based on the positions of the lands and pads; and wiring based on the pin pairs determined by the pin pair determining means. A printed wiring board design apparatus comprising: a wiring means for performing and determining the end of all wiring processes; and a wiring data output means for outputting wiring data of a wiring pattern to an external file when the determination of the wiring end is received. Wherein the input means includes means for inputting logical connection information having a wiring modification attribute of a circuit diagram; The pair determining means includes means for adding the logical connection information in addition to the land and pad positions to determine a pin pair, and one of the wiring pin pairs determined by the pin pair determining means has the attribute of the wiring modification. A connection judging means for judging whether or not there is, and drawing out a pattern from the pin having the attribute of the wiring remodeling to the outside of the component outer shape, setting the drawn out end point to be a virtual terminal, and moving the drawn out pattern A printed wiring board designing apparatus, comprising: a prohibition setting means. 3. A drawing pattern setting and movement prohibition setting means determines whether or not wiring processing has been completed for all pins of a wiring pin pair, and when the wiring processing has been completed, a wiring processing completion notification is issued. 3. The printed wiring board designing apparatus according to claim 2, further comprising a sending unit.