JPH04111075A - Device for designing printed circuit board wiring - Google Patents

Abstract

PURPOSE:To reduce man-hour and cost by deciding the direction of drawing a pattern according to a logical attribute and drawing the signal pattern having the high possibility of improvement to the outside of a part pad. CONSTITUTION:An input means 1 inputs a logical connection information 21 of a circuit diagram, and a pin pair deciding means 3 decides a pin pair while adding the logical connection information 21 as well as land and pad positions. A connecting state deciding means 4 decides whether one of paired pins is connected to a surface mounting part or not and also decides whether the connection is on the side of a power source or a ground. When one of paired pins connected to surface mounting parts is connected to the side of the power source or the ground, a signal pattern setting means 5 sets the signal pattern so as to draw it from the outside of the part loading pad. Thus, man-hour and cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is utilized for printed board wiring design in electronic device mounting design. The present invention relates to a printed circuit board wiring design apparatus that determines the drawing direction of a pattern based on logical attributes and arranges the pattern.

〔overview〕

The present invention uses a printed circuit board wiring design device that designs wiring for printed wiring boards on which surface-mounted components are mounted. By pulling out the circuit board, it is possible to reduce the work required to modify the board and reduce man-hours and costs.

[Conventional technology]

Conventionally, in the wiring design of printed wiring boards equipped with surface mount components (QFP, SOJ, etc.), the direction of pattern extraction from component mounting pads has been determined in the component library, regardless of the logical attributes of the component. .

[Problem to be solved by the invention]

In the above-mentioned conventional wiring device compatible with surface mounting, the pattern extraction direction from the component mounting pad is determined by the pattern extraction direction of the component library, and the logical attributes of the component pin are not taken into account, so the pattern is a signal pin. or GV pins (power supply/GND pins), and as a result, highly modifiable signal pins are pulled out inside the pad, and GV pins, which are not very modifiable, are pulled out to the outside of the pad. There is. In such cases, a special jig is required to cut the pattern and remove the parts for modification.
There is also the problem that the board becomes unusable due to accidents such as peeling off of the copper foil pads.

SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and aims to provide an apparatus that can reduce the number of modifications performed after wiring by determining the direction in which a pattern is drawn out based on logical attributes.

[Means to solve the problem]

The present invention provides input means for inputting component placement coordinate values for setting component placement positions and a component library that defines the positions of component pads and lands for each component, and wiring for pads and lands based on the input information. A component mounting pad expansion device that expands on the area map, a pin pair determination device that determines pin pairs to be wired based on the positions of lands and pads, performs wiring based on the determined pin pairs, and determines the completion of all wiring processing. wiring means to
A printed circuit board wiring design apparatus comprising a wiring data output means for outputting wiring pattern data to an external file when a wiring completion determination is received, the input means including means for inputting logical connection information of a circuit diagram. , the pin pair determining means includes means for determining a pin pair by adding the logical connection information in addition to land and pad positions, and one pin of the wiring pin pair determined by the pin pair determining means is connected to a surface mount component. connection state determining means for determining whether the pin is connected to the surface mount component and determining whether the connection is to the power supply or ground side when the pin is connected to the surface mount component; The device is characterized by comprising a signal pattern setting means for setting the signal pattern so that it can be drawn out from inside the component mounting pad when one of the pins is connected to the power supply or ground side.

The signal pattern setting means includes means for setting the signal pattern so that it can be drawn out from the outside of the component mounting pad when one of the pins connected to the surface mount component is not connected to the power supply or the ground side, and wiring. It is desirable to include means for determining whether wiring processing for two pins of a pin pair has been completed, and transmitting a wiring processing completion notification to the wiring means when the wiring processing has been completed.

[Effect]

When drawing a pattern from a pad in the wiring design of a printed wiring board on which surface-mounted components are mounted, the drawing direction of the pattern is determined by logical attributes, and signal patterns that are likely to be modified are directed toward the outside of the component pad. The power supply/GND patterns that are less likely to be modified are arranged so as to be pulled out preferentially toward the inside of the component pad.

As a result, it is possible to reduce the frequency of cutting patterns during remodeling, reduce damage to the substrate, and reduce man-hours and costs.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention, FIG. 2 is a flowchart showing the flow of logic circuit implementation design according to the conventional example and the embodiment of the present invention, and FIG. It is a flowchart which shows the flow of such implementation design.

The device according to the embodiment of the present invention is related to logic circuit design,
In particular, it relates to placement and wiring in packaging design.

In the embodiment of the present invention, an input means 1 inputs component placement coordinate values 22 for setting component placement positions and a component library 23 for defining the positions of component pads and lands for each component.
and a component mounting pad development means 2 that develops pads and lands on a wiring area map based on the input information;
A pin pair determining means 3 determines pin pairs to be wired based on the positions of lands and pads, a wiring means 6 performs wiring based on the determined pin pairs and determines whether all wiring processing is completed, and a wiring means 6 receives a determination of completion of wiring. The present invention also includes a wiring data output means 7 for outputting wiring pattern data to an external file 24 when a pin pair is selected. The determining means 3 includes means for determining a pin pair by adding logical connection information 21 in addition to the land and pad positions, and determines whether one pin of the wiring pin pair determined by the pin pair determining means 3 is connected to the surface mount component. Connection state determining means 4 for determining whether the pin is connected to a surface mount component and determining whether the connection is to the power supply or ground side when the pin is connected to the surface mount component.
and signal pattern setting means 5 for setting the signal pattern so that it can be pulled out from inside the component mounting pad when one of the pins connected to the surface mount component is connected to the power supply or ground side, The signal pattern setting means 5 includes means for setting the signal pattern so that it can be drawn out from the outside of the component mounting pad when one of the pins connected to the surface mount component is not connected to the power supply or the ground side. It includes means for determining whether the wiring process for two pins of the wiring pin pair is completed or not, and for sending a wiring process completion notification to the wiring means 6 when the wiring process is completed.

Next, the operation of the embodiment of the present invention configured as described above will be explained. FIG. 4 is a flowchart showing the flow of operation of the embodiment of the present invention.

First, logical connection information 21 such as a circuit diagram is input in the form of IJ cost (processing Sl). Next, the component placement coordinate values 22 to be mounted on the printed board are input (process 32
). A component library 23 defining the positions of component pads and lands for each component is input, and the pads and lands are developed on the wiring area map (processing S3). Next, the pin pair to be wired is determined from the logical connection information 21 input in step S1 and the land and pad positions (step S4).

It is checked whether one pin of the wiring pin pair determined in this process S4 is connected to a surface mount component (process 35). If it is connected to a surface mount component, check whether the pin is a power/GND signal or not (processing S6). hole) is provided (processing S7). If it is a signal line, the signal pattern is drawn out from the outside of the component mounting pad and a via hole is provided (processing S8).

Next, process 85 to process S for the two pins to be wired.
It is checked whether the processes up to 8 have been completed (process S9), and if they have not been completed, the process returns to process s5, and if they have been completed, the via hole or T/H that occurred in processes 85 to S8 is checked.
A wiring process is performed using the land as a routing target (process 510). Check whether processing has been performed on all pin pairs (processing 511), and if processing has not been performed, return to processing s5; if processing has been performed, output the wiring pattern data to the external file 24 (processing 512)
.

FIG. 5 shows an example of a pattern connected by such an operation.

〔Effect of the invention〕

As explained above, according to the present invention, the drawing direction of patterns in wiring design is determined based on logical attributes, and signal patterns that are likely to be modified are drawn outside of component pads, and power supplies and By extending the GND pattern to the inside of the component pad, it is possible to reduce the work required to peel off surface-mounted components due to board modification, thereby reducing man-hours and costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart showing the flow of logic circuit design according to the conventional example and the embodiment of the present invention. FIG. 3 is a flowchart showing the flow of packaging design according to the conventional example and the embodiment of the present invention. FIG. 4 is a flowchart showing the operation flow of the embodiment of the present invention. FIG. 5 is a diagram showing an example of a pattern connected according to an embodiment of the present invention. 1... Input means, 2... Component mounting pad deployment means,
3... Pin pair determining means, 4... Connection state determining means, 5... Signal pattern setting means, 6... Wiring means,
7... Wiring data output means, 13... GND component mounting pad, 14... Pattern, 15... Signal component mounting pad, 16... VCC component mounting pad, 1
7...via honope21...logical connection information, 22
...Component placement coordinate value, 23...Parts library, 2
4...External file.

Claims (3)

[Claims] 1. Input means for inputting component placement coordinate values to set the component placement position and a component library that defines the position of component pads and lands for each component, and pads and lands are placed on the wiring area map based on the input information. A component mounting pad expanding means to be expanded; a pin pair determining means for determining pin pairs to be wired based on the positions of lands and pads; and a wiring means for performing wiring based on the determined pin pairs and determining completion of all wiring processing. , a printed circuit board wiring design apparatus comprising a wiring data output means for outputting wiring pattern data to an external file when a wiring completion determination is received, further comprising means for inputting logical connection information of a circuit diagram into the input means. The pin pair determining means includes means for determining a pin pair by adding the logical connection information in addition to the land and pad positions, and for one pin of the wiring pin pair determined by the pin pair determining means to be attached to a surface mount component. connection state determining means for determining whether the pin is connected to the surface mount component and determining whether the connection is to the power supply or ground side when the pin is connected to the surface mount component; and signal pattern setting means for setting the signal pattern so that the signal pattern can be pulled out from inside the component mounting pad when one of the pins connected to the component mounting pad is connected to the power supply or ground side. Design equipment. 2. The signal pattern setting means includes means for setting the signal pattern so that it can be drawn out from the outside of the component mounting pad when one of the pins connected to the surface mount component is not connected to a power supply or a ground side. Item 1. The printed board wiring design device according to item 1. 3. The signal pattern setting means determines whether wiring processing for two pins of the wiring pin pair is completed;
2. The printed board wiring design apparatus according to claim 1, further comprising means for sending a wiring processing completion notification to said wiring means when wiring processing is completed.