JPH0454525Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention relates to an automatic printed circuit board design device,
In particular, it concerns improvements in the display method of graphic terminals.

[Prior Art] Printed circuit board automatic design apparatuses that automatically design pattern wiring and component placement on a printed wiring board with the aid of a computer are well known.

[Problems to be Solved by the Invention] When displaying the front and back sides of a printed circuit board simultaneously on one screen with a conventional device of this type, parts and wiring patterns on the front and back sides may overlap in the display. In that case, the following methods are used, but each method has its own problems.

The displayed line types are different for the front and back sides (for example, solid lines and broken lines), but when the front and back sides overlap, only the solid lines are displayed and the broken lines cannot be distinguished.

In a method that changes the display color, if there is only one color display surface, the latter (the one output to the screen last) remains and the one output first becomes invisible.

In a method in which display surfaces are prepared for the front and back surfaces of a printed circuit board, and a neutral color is used for the overlapping portions of the front and back, a large number of display surfaces are required and the cost is relatively high.

An object of the present invention is to realize an automatic printed circuit board design device that can display parts and wiring patterns in overlapping positions on the front and back of a printed circuit board in a distinguishable manner on a small display surface (one screen).

[Means for Solving the Problems] In order to achieve such an object, the present invention provides an offset The vector information and color information are read out, and if the mounted component positions overlap on the front and back sides, the shift amount is set to a predetermined value for the component position on one side, and when the mounted component positions do not overlap on the front and back sides, the shift amount is set to zero. means having the function of A vector generator that outputs information, and the output of the offset XY register and the vector generator.
an adder that adds the raster address of the vector generator; and a video controller that stores color information output from the vector generator at the address obtained by this adder.
It is characterized by having a memory.

[Operation] In this invention, a vector generator performs vector/raster conversion, and the obtained raster/raster
Add the value of the offset XY register for the address to obtain the display raster address. The color data is stored in the video memory using this address.

If the contents of this video memory are displayed as they are, the front and back parts whose positions overlap will be displayed in different colors at positions shifted by a predetermined amount with respect to the other part.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of essential parts showing an embodiment of an automatic printed circuit board design apparatus according to the present invention. In the figure, 1 is an offset
is set.

Reference numeral 2 denotes a vector generator which converts the display vector of a graphic element given from the central processing unit (hereinafter referred to as CPU) 5 via the bus 6 into the coordinates (x, y) of a raster dot.

3 is an adder which inputs the output x, y of vector generator 2 and the data Δx,
Add Δy and calculate X=x+Δx, Y=y+Δy.

4 is a memory usually called video RAM (RAM is random access memory) for storing display images in units of dots, and has an address corresponding to the display screen and coordinate values given from adder 3. The display color data stored in the pattern generator 2 can be written to the address corresponding to (X, Y).

The operation in such a configuration will be described next with reference to the flows shown in FIGS. 2 and 3.

1 The CPU 5 extracts a display element from a display file and extracts the attributes of the display element. Its attributes include front and back attributes.

2 Determine whether the display is on the back side of the printed circuit board based on the attribute.

3 For the back side, set the offset amount in offset XY register 1. Offset for surface
Set the shift amount to zero in XY register 1.

4. Extract display vector and display color information from the display file, convert it to a vector generator command, and set it in vector generator 2.

5. The vector generator 2 obtains data to be set in the video RAM 4 from the color information command, and also performs vector/raster conversion on the vector information command to obtain raster addresses x, y.

6 Add the outputs of vector generator 2 and offset XY register 1 using adder 3 to find X=x+Δx, Y=y+Δy.

7 Video indicated by the above X, Y address values
Write the color information data obtained in 5) above into RAM4.

8 Repeat the above operation for all vector information and end.

Figure 4 is a diagram showing an example of a drawing point sequence, where Δx≠0,
In the case of Δy≠0, the drawing point sequence output by the vector generator 2 [hatched circle 41]
(x, y) and is written on video RAM4.
Dot array displayed on CRT [white circle 42]
This represents the positional relationship of (X, Y).

FIG. 5 shows an example of a printed circuit board on which surface-mounted components are mounted so that their front and back surfaces overlap. Figure A shows the conventional display, in which the back and front parts overlap, resulting in the color of what is displayed later. Figure B shows the display according to the present invention, and it can be seen that the front part (for example, shown in blue) and the back part (for example, shown in red) are displayed with appropriate deviations, making them easy to identify.

It is also possible to set the shift amounts Δx and Δy within the vector generator by providing an equivalent function in the vector generator 2 command without using the offset XY register. be.

Alternatively, a display processor may be provided to calculate the shift amount in advance and send the result to the vector generator. At this time, a shift amount set command for the offset XY register and vector generator is not necessary.

Note that the CPU can arbitrarily select whether to display the images in a shifted manner or to display them in an overlapping manner.

[Effects of the invention] As explained above, according to the invention, when overlapping pictures are displayed on a graphics terminal with only one color display surface, and the display part and the back part overlap, It is very effective in identifying cases where the front wiring pattern and the back wiring pattern overlap.

[Brief explanation of the drawing]

Fig. 1 is a main part configuration diagram showing an embodiment of the automatic printed circuit board design device according to the present invention, Figs. 2 and 3 are diagrams showing the operation flow, and Fig. 4 explains the display of deviation of the drawing dot array. FIG. 5 is a diagram showing an example of how parts are displayed. 1...offset XY register, 2...vector generator, 3...adder, 4...video
RAM, 5...CPU, 6...Bus.

Claims (1)

[Claims for Utility Model Registration] A computer is used to automatically design the pattern wiring of a printed wiring board and the arrangement of parts, and also to display graphical elements such as pattern wiring and parts stored in a display file on a display screen. In an automatic printed circuit board design device configured to display, display vector information and color information related to a graphic element are read from an offset means having a function of setting the shift amount to a predetermined value for the component positions on one side when the mounted component positions overlap, and setting the shift amount to zero when the mounted component positions do not overlap on the front and back sides; a vector generator that receives display vector information and display color information in which display colors differ from each other depending on the front and back sides of the printed circuit board, obtains a raster address from this display vector information, and outputs color information together with the raster address; Offset XY register output and vector
an adder that adds the raster address of the vector generator; and a video controller that stores color information output from the vector generator at the address obtained by this adder.
An automatic printed circuit board design device characterized by comprising a memory.