JPS5929247A - Method for wiring printed circuit board - Google Patents

Abstract

PURPOSE:To enable wiring of a printed circuit board with high efficiency without manual operation, by calculating an allowable range of pattern length in a wiring section, grouping the wiring section, and dividing the shortest wiring section, etc. successively in five steps of processing. CONSTITUTION:Delays of signals are calculated in the wiring section, and allowable pattern length of the section is obtained by calculation. Then, the wiring section is grouped from Manhattan length on the printed circuit board of the logic section in which the allowable range of print pattern length and signal delay time are regulated. Each grouped wiring section is divided into an inclined pattern section and a straight line pattern section so as to satisfy the conditions of the allowable pattern length range. Each wiring section is divided into >=2 wiring sections so as to satisfy the conditions of the allowable pattern length range. Finally, print patterns in each wiring section, each inclined pattern section, each straight line pattern section, and each wiring section after the division are decided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printed circuit board wiring method using a computer for determining a printed pattern for wiring of components mounted on a printed circuit board.

Prior Art In the conventional printed circuit board wiring method using a computer,
The wiring sections between component pins to be connected were made as short as possible using rectangular printed patterns.

However, there are 8 types of wiring sections as shown below, and it is necessary to manually design printed patterns for the shortest wiring and detour wiring sections, which poses problems in terms of cost and installation time. .

Shortest wiring section: A wiring section with a small margin for signal delay.

General wiring section: General wiring section.

Detour wiring section: A section where wiring is detoured so that all components have the same signal delay, such as a clock signal.

Purpose of the Invention The purpose of the present invention is to eliminate the need for manual intervention as described above;
Moreover, it is an object of the present invention to provide a printed circuit board wiring method using improved abrasion, which is easy to implement and can utilize wiring methods that are currently common.

The details of the wiring method, which is one of the currently known methods for automating the stacking of printed patterns on printed circuit boards, have been revealed.

1) In general printed circuit boards, 90% of the total wiring section
% or more is the Manhattan length shown in Figure 1 (='+"2)
You can create a print pattern with . Here, 1 is a component pin and 2 is a printed pattern.

11) The conventional wiring method has the best performance when forming a rectangular printed pattern as shown in FIG. 1, and the worst performance when forming a detour as shown in FIG. 2.

In order to design printed patterns without human intervention for the shortest wiring and detour wiring sections while making use of these characteristics of conventional wiring methods, Akenobu Mizuben's printed circuit board wiring method includes: Each wiring section is defined according to the relationship between its signal delay time and Manhattan length.
Classified into the shortest wiring group, detour wiring group, and -membrane wiring group. Furthermore, the wiring section classified into the shortest wiring group is divided into a diagonal pattern section and a stone line pattern section. -Also, set the wiring section of the detour wiring group to 2
Divide into three or more wiring sections. Then, print patterns are determined for the wiring section of the - membrane wiring group, the pattern section after dividing the wiring section of the shortest wiring group, and the wiring section after dividing the wiring section of the detour wiring group. This can be easily carried out using the maze method, line search method, etc.).

Embodiments of the Invention The printed circuit board wiring method according to the present invention, as shown in FIG. The pattern determination is performed in five processing stages. Each processing stage will be explained below.

Calculation of the W1 capacity pattern length range of the wiring section The signal delay of the wiring section is calculated, and the allowable pattern length of the wiring section is calculated. The procedure of this process will be explained using the example shown in FIG.

(1) Calculate the signal delay time of the logical section in which the signal delay is specified from the signal delay time of the element and the virtual print pattern length (Manhattan length). In the example of Figure 5, 1. X, di + , X, till, are the delays. Here, di is the signal delay time of the element itself, and 鵠 is the virtual print pattern length 73. , (1=x, is the signal delay time depending on 2°3.9.

(11) Range of signal delay time allowed in wiring section (D
±Δd), the allowable range (DL±Δdl) of the signal delay time of only the print pattern is calculated according to the following equation.

1)'rJ±1dl=D±Δd−Σ d−1 (li+) From the following equation, determine the print pattern length tolerance range (■)±Δ71.

(1) L Δd/)=f(L±Δl) The group of wiring sections is the wiring section on the printed circuit board of the logical section where the permissible range of printed pattern length (L±Δl) and signal delay time are specified. - Divide wiring sections into groups based on the tube length.

In the example of FIG. 5, the pattern length corresponding to di, to d14 is 1. -14 total value and the allowable glint pattern length (L±
Divide into the following 8 groups using the Compare button.

Shortest wiring group: When the Manhattan length exceeds the upper limit (L+Δl) of the print pattern length tolerance, it is classified into the group. The example in FIG. 5 is a case of 菰Σ/+)L+Δl.

Detour wiring group: When the Manhattan length is less than the lower limit (L-Δl) of the allowable print pattern length range, it is classified into this group. In the example in Figure 5, 11111r
<L-Δl.

- Membrane wiring group If the Manhattan length falls within the permissible print pattern length range, or if the wiring section has no specified signal delay time, it is classified into this group. In the example of FIG. 5, L-Δl×Σl, <L-1-Δi.

= 1 = 1 = Dividing the wiring sections of the shortest wiring group The wiring sections of this group are wired using the straight pattern surface and diagonal pattern surface of the glint board so as to satisfy the printed pattern length r.

Here, the printed circuit board has linear pattern surfaces A and B in the X and Y directions (the pattern directions are as indicated by the arrows in the figure), as shown in FIG. 4, and diagonal pattern surfaces C and D. (The pattern direction is as indicated by the arrow in the figure). The procedure will be described below using the wiring section shown in FIG. 6 as an example.

(1) Extract the diagonal pattern wiring section from the diagonal pattern surface C of the printed circuit board in Figure 4.
(D only by -1) is used to extract diagonal pattern 5 that is not to be wired.

(11) Pins 6 of virtual components at both ends of the diagonal pattern 5 extracted by dividing the wiring section
is provided, and the wiring section is divided into an extra pattern section and a straight line pattern section. In the example of Fig. 0, the position 1d of virtual component pin 6 is set as c, d, and the position of actual component pin 1 is set as a, b, and the wiring section a-b is one shore line pattern section a-c and b.
-d, and the diagonal pattern section c -d is divided into K.

Here, the straight line pattern section is the straight line pattern plane A in Figure 4.
Or wired using B.

Division of wiring sections of detour wiring group The wiring sections of group B (detour wiring m) are divided according to the following procedure.

(1) Detour virtual pin setting In the middle of the wiring section, print pattern length tolerance (L:
A detour virtual pin is set at a position that satisfies I:Δl).

In the example of Figure 7, for example, position! Set IVL virtual bin 7. L-Δl≦l, -1-1', -1-1,≦L+
Any position may be used as long as the position is Δl.

(11) Wiring section division The wiring section is divided between two wirings Iz with the detour virtual pin as a boundary. Fig. 7 Wiring section --f is wiring section g -
It is divided into y and qf.

Determination of Print Patterns Print patterns for wiring are determined for the wiring sections after division of the shortest wiring group, the wiring sections after division of the detour wiring group, and the wiring sections of the - film wiring group.

This is done by a conventional wiring method, such as a maze method or a line segment search method, and the allocation of pattern planes (A-D in FIG. 4) is as follows.

The diagonal pattern surface Ct or D is assigned to the print pattern for the diagonal pattern section of the wiring section of the shortest wiring group. Straight line pattern 1 A or B is assigned to the straight line pattern sections of the wiring sections of the shortest wiring group and the printed patterns for the wiring sections of other groups.

Effects of the Invention According to the present invention described in detail above, printed circuit board wiring can be performed extremely efficiently without manual intervention. Moreover, since the print pattern for each wiring section can be determined by the same wiring method as in the past, the present invention is easy to implement.

[Brief explanation of the drawing]

Figure 1 shows the Manno-Tutan length of the wiring section, Figure 2
The figure shows an example of detour wiring in a wiring section, Figure 8 is a processing flowchart of the present invention, Figure 4 is a diagram showing an example of a printed circuit board to which the present invention is applied, and Figure 5 is a signal delay time. FIG. 0 is a diagram showing an example of dividing the shortest wiring section, and FIG. 7 is a diagram showing an example of dividing the i-th wiring section. ]...Parts bin, 2...Print pattern, 5.
... Diagonal pattern, 6... Virtual component bin, 7... Detour virtual bin.

Claims (1)

[Claims] (1) The printed circuit board for connecting the bins of components on the printed circuit board is made in the following steps (A) to G.
] A printed circuit board wiring method using a subtraction machine, characterized by determining by +. (a) For the wiring section between a pair of component bins to be connected, calculate the allowable pattern length range determined by the condition of signal delay time between component bins. (b) For each wiring section, if the Manhattan length between the component bins exceeds the upper limit of the allowable pattern length range calculated in step (a) above, the shortest wiring group trap is applied, and the manhattan length is the lower limit of the allowable pattern length range. If the length of the pattern is smaller than that, it is classified into the detour wiring group, and when the Manhattan length falls within the allowable pattern length range, and when the signal delay time is not yet specified, it is classified into the general wiring group. (c) Each wiring section classified into the shortest wiring group in step (b) above is divided into diagonal pattern sections and straight pattern sections so as to satisfy the allowable pattern length range conditions calculated in step (a) above. do. B) Divide each wiring section classified into a detour wiring group in step (b) above into two or more VC wiring sections so as to satisfy the condition of the allowable pattern length range calculated in step (a) above. (e)], after dividing into each wiring section classified into the membrane wiring group in step (b), each diagonal pattern section and each straight pattern section divided in step (c) above, and into the above step). The print pattern for each wiring section is determined.