JP2884143B2 - Display device of net between blocks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a display device for a net between blocks, and more particularly, to a printed circuit board C.
The present invention relates to a display device for a net between blocks which is suitable for use in displaying a net between circuit function blocks in an AD system.

[0002] In this specification, the term "block" means an aggregate composed of a plurality of components, and the term "net" refers to a logical relationship between a component of a certain block and a component of another block. Means a logical connection having physical information such as a proper connection and a width of a "track" at the time of physically connecting.

[0003] In this specification, the term "track" refers to
A conductor pattern as an electrical wiring for actually connecting the components based on the net, or a pipeline for actually connecting the components physically based on the net to ensure conduction. And so on.

[0004]

2. Description of the Related Art Generally, when a layout design is performed in a printed circuit board CAD system, a block called a circuit function block is formed by collecting a plurality of circuit components having the same functions as constituent elements, and the circuit function is designed. It is known that when arranging blocks on a printed circuit board, it is necessary to design in consideration of the relationship between adjacent circuit function blocks.

Conventionally, when such a relationship between adjacent circuit function blocks is displayed on a graphic display device of a printed circuit board CAD system, parts constituting one circuit function block and parts constituting the other circuit function block are referred to. A logical connection to be connected (this logical connection is a “net” in the present specification. Therefore, in the following, this logical connection is appropriately referred to as a “net”) is a circuit on a screen. The area corresponding to the functional block is indicated by a line segment.

[0006] By the way, as the number of conductor patterns connecting the components constituting each circuit functional block increases,
The logical connection between the circuit function blocks becomes stronger. To display the strength of the logical connection between the circuit function blocks on a screen, a line segment connecting the regions corresponding to the circuit function blocks is displayed. Is expressed in proportion to the number of conductor patterns connecting the components constituting the circuit functional block.

That is, if the number of conductor patterns connecting the components constituting each circuit function block increases, the logical connection between the circuit function blocks becomes stronger, so that each circuit function block is constituted. The width of the line connecting the regions corresponding to the circuit functional blocks is increased in proportion to the number of conductor patterns connecting the components, and the net is displayed on the screen in this manner.

For example, there are two conductor patterns connecting the components of the block a and the components of the block b,
If there are four conductor patterns connecting the component parts of the block a and the component parts of the block c, the blocks a, b and c are displayed on the screen of the graphic display device.
If the net is displayed by connecting the area corresponding to the block a and the block b with a line segment having the width w and the area corresponding to the block a and the block c, The nets are displayed by connecting the areas with a line segment having a width of 2w.

For this reason, the layout designer confirms the width (thickness) of the line segment between the areas corresponding to the circuit function blocks displayed on the screen, thereby establishing the logical connection between the circuit function blocks. The strength could be easily known.

[0010]

As described above, according to the display of nets between circuit function blocks by the graphic display device of the conventional printed circuit board CAD system, the strength of the logical connection between the circuit function blocks is reduced. Although it can be easily checked, when actually wiring the conductor pattern between the components that make up the circuit function block based on the net, how much wiring space should be secured around the circuit function block? There was a problem that he did not know at all what to do.

For this reason, in the related art, the width of each conductor pattern connecting the components constituting the circuit function block and the minimum distance between the lines (the “minimum line distance” means that when arranging the lines, other minimum distances). This is the minimum distance that must be kept away from lines and blocks.In the circuit function block, lines are conductor patterns, and conductor patterns are generally formed of conductor foil.
The “minimum line-to-line distance” for lines in the circuit functional block is referred to as “minimum distance between foils”. ), Etc., after conducting calculations based on predetermined dimensions when actually wiring the conductor pattern between the components constituting the circuit functional block, and then actually conducting the conductor pattern between the components constituting the circuit functional block. It was necessary to confirm what width of wiring space was required to perform the above wiring, and to perform layout design of the arrangement of the circuit function blocks based on that.

That is, according to the conventional display of nets between circuit function blocks, the width of a wiring space required for actually conducting wiring of a conductor pattern between components constituting the circuit function blocks is visually confirmed. Therefore, there is a problem that workability is poor.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a method for actually performing line wiring between components constituting a block. It is an object of the present invention to provide a display device for a net between blocks, in which the width of a necessary wiring space can be easily confirmed visually and the operability is improved.

[0014]

In order to achieve the above object, a display device for a net between blocks according to the present invention comprises:
For a plurality of blocks composed of one or more components, for all nets between each block indicating a connection between a component of a certain block and a component of another block, wiring is performed between the blocks based on each net. Storage means for storing predetermined dimensions at the time of execution, calculation means for calculating a wiring space width indicating the width of the wiring space of the line between the blocks based on the dimensions stored in the storage means, and the calculation means And display means for displaying a net based on the wiring space width calculated by the above.

Accordingly, the display means displays the wiring space width indicating the wiring space of all the lines connecting the components of each block, so that the wiring of the lines is actually performed between the components of the block. The width of the necessary wiring space can be easily confirmed visually, and the workability is greatly improved.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a display device for displaying nets between blocks according to the present invention.

FIG. 1 is a block diagram showing an embodiment of a net display device between blocks according to the present invention when applied to a graphic display device of a printed circuit board CAD system. The display device 10 for an intermediate net includes an arithmetic unit 12 and a display unit 14 for displaying a graphic on a screen of a display device such as a CRT.

The arithmetic section 12 generates a graph structure for generating data (block netgraph data) indicating a block netgraph as shown in FIG. 2 based on the circuit function block data and the netlist data stored in the database 16. Based on the unit 12a and the netlist data and the design rule data stored in the database 16, the width of the wiring space (hereinafter referred to as the wiring space (conductor pattern) necessary for actually performing the wiring of the line (conductor pattern) between the circuit function blocks based on the nets. , "Wiring space width") between the blocks.

Here, the circuit function block data is data indicating the components of each circuit function block, and the netlist data is the data of the components of one circuit function block and the other between the two circuit function blocks. This is data indicating a net which is a logical connection relationship with a component of the circuit function block. The graph structure generation unit 1 uses the circuit function block data and the net list data.
2a generates block net graph data indicating a block net graph as shown in FIG.

In the block net graph shown in FIG. 2, each component of block A, block B, block C and block D is based on netlist data.
It is shown that they are logically connected by nets indicated by line segments N1 to N13 (in FIG. 2, for easy understanding, the display of nets between components in each block is shown). Is omitted.)

Note that such block net graph data is stored in the database 18 and can be read out at any time.

The design rule data, as shown in the table of FIG. 3, is a conductor pattern width (hereinafter, simply referred to as "pattern width") which is the width of a conductor pattern actually wired based on each net. And data indicating the value of the minimum inter-foil distance (minimum inter-foil value). By using the netlist data and the design rule data, the inter-block wiring space width calculation unit 12b determines the circuit function block based on the net. Calculate the wiring space width required when actually wiring the conductor pattern between the components.

The design rule data shown in FIG. 3 is shown as corresponding to the block net graph shown in FIG.

Next, the inter-block wiring space width calculation unit 1
The calculation performed in 2b based on the block net graph shown in FIG. 2 and the design rule data shown in FIG. 3 will be described below.

For example, considering the net between block B and block C with reference to FIG.
Between the block C and the line segment N, as shown in FIG.
There are two nets indicated by 6 and a line segment N11.

Here, from the design rule data shown in FIG. 3, the pattern width of the net indicated by the line segment N6 is "0.15", the minimum inter-foil value is "0.20", and is indicated by the line segment N11. The pattern width of the net
5 "and the minimum inter-foil value is" 0.25 ".

Accordingly, the wiring space width W required for actually conducting the wiring of the conductor pattern between the block B and the block C based on the net indicated by the line segments N6 and N11 is shown in FIG. As shown, W = a + b + c + d + e = 0.20 + 0.15 + 0.2
5 + 0.25 + 0.25 = 1.10 a: Minimum inter-foil value of the conductor pattern based on the net indicated by the line segment N6 b: Pattern width of the conductor pattern based on the net indicated by the line segment N6 c: indicated by the line segment N6 Larger value among the minimum inter-foil values of the conductor pattern based on the net to be connected and the conductor pattern based on the net indicated by the line segment N11 (the conductor pattern based on the net indicated by the line segment N6 and the line segment N11). In order to satisfy the minimum inter-foil value of both the conductor pattern based on the net and the minimum inter-foil value between the conductor pattern based on the net indicated by the line segment N6 and the conductor pattern based on the net indicated by the line segment N11. Select the larger value with.) D: Pattern width of conductor pattern based on net indicated by line segment N11 E: Line segment N1 The minimum foil between values of the conductor pattern based on the net indicated by.

Similarly, in the inter-block wiring pattern width calculator 12b, regarding the net between the block A and the block B, the net between the block B and the block D, and between the block D and the block C, With respect to the net, with respect to the net between the block C and the block A, and with respect to the net between the block A and the block D, the wiring pattern width required when actually wiring the conductor pattern is calculated.

A net is displayed on the screen by the display unit 14 on the basis of the value of the wiring pattern width between the blocks obtained by the wiring pattern width calculating unit 12b as described above.

FIGS. 5 and 6 show display examples of the display of the net on the screen by the display unit 14. Both the display examples of FIGS. 5 and 6 are shown in the block net graph shown in FIG. 2 and in FIG. The display is based on the design rule data, and the net is displayed based on the wiring pattern width between the blocks obtained by the inter-block wiring pattern width calculation unit 12b.

That is, in the display example shown in FIG. 5, the net between the blocks is indicated by a line connecting the areas corresponding to the blocks, and the thickness (width) of the line is shown.
Is indicated by a thickness (width) in proportion to the value of the wiring space width between the blocks obtained by the inter-block wiring space width calculating unit 12b.

That is, regions corresponding to the blocks A, B, C and D are shown, and the nets existing between the blocks have a thickness (width) proportional to the value of the wiring space width between the blocks. ).

Therefore, referring to FIG. 5, based on the nets between the blocks, the width of the wiring space required for actually conducting the wiring of the conductor pattern between the components constituting the block can be easily visually understood. can do.

In the display example shown in FIG. 5, similarly to the conventional display of the net between blocks, when the area indicating the block is moved on the screen, each of the widths calculated by the inter-block wiring space width calculating unit 12b is obtained. A line segment having a thickness (width) indicated in proportion to the value of the wiring space width between blocks is also moved so as to follow an area indicating a block with the same thickness (width).

On the other hand, in the display example shown in FIG. 6, the width of the wiring space between each block and the number of nets are displayed in a table format. In such a display example, the wiring space width between each block and the number of nets can be simultaneously displayed in a list format, which is convenient.
Based on the nets between the blocks, it is possible to visually and easily understand the wiring space width required for actually performing the wiring of the conductor pattern between the components constituting the blocks.

In the above description, the case where the present invention is applied to a graphic display device of a printed circuit board CAD system has been described. However, the present invention is not limited to this.
Electrical design other than the printed circuit board CAD system, pipeline design in a plant (plant becomes a block, pipeline becomes a net), or railway line design (stations and garages become blocks, and the net becomes a railway line) Of course).

[0037]

Since the present invention is constructed as described above, the width of the wiring space necessary for actually performing the wiring of the lines between the constituent elements of the block can be easily visually determined. Since the confirmation can be performed, the workability can be greatly improved, which is an excellent effect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a display device of a net between blocks according to one embodiment of the present invention when applied to a graphic display device of a printed circuit board CAD system.

FIG. 2 is an explanatory diagram showing an example of a program netgraph.

FIG. 3 is a table showing an example of design rule data.

FIG. 4 is an explanatory diagram for explaining a calculation method of a wiring space width in an inter-block wiring space width calculation unit;

FIG. 5 is an explanatory diagram showing an example of a display example on a screen by a display device of a net between blocks according to one embodiment of the present invention;

FIG. 6 is an explanatory diagram showing another example of a display example on a screen by the display device for a net between blocks according to one embodiment of the present invention;

[Explanation of symbols]

 10 Net display device between blocks 12 Operation unit 12a Graph structure generation unit 12b Wiring space width calculation unit between blocks 14 Display unit 16 Database 18 Database

Claims (4)

(57) [Claims] 1. With respect to a plurality of blocks composed of one or more components, all the nets between the blocks that indicate the connection between the components of a certain block and the components of another block are determined based on each net. Storage means for storing a predetermined dimension when a line is routed therebetween; calculating means for calculating a wiring space width indicating the width of the wiring space of the line between each block based on the dimensions stored in the storage means And a display unit for displaying a net based on the wiring space width calculated by the calculation unit. 2. The display device for displaying nets between blocks according to claim 1, wherein the display means displays each block and a line connecting the blocks, and calculates the width of the line. A display device for displaying nets between blocks, in which the display is performed in proportion to the wiring space width calculated by the following. 3. The display device according to claim 2, wherein said display means moves the display of a line segment connecting the blocks, following the movement of the display of each block. 4. The display device for displaying nets between blocks according to claim 1, wherein said display means displays the wiring space width calculated by said arithmetic means as a numerical value. apparatus.