JPH01291377A - Signal name arrangement determining system - Google Patents

Abstract

PURPOSE:To obtain a circuit diagram which can easily be discriminated visually by optimizing a signal name arrangement position of a wiring route in logic circuit connecting information. CONSTITUTION:A logic circuit diagram wiring mechanism 5 is provided with a signal line wiring means 51 for determining a signal line wiring route between each circuit symbol which has been placed by a logic circuit diagram symbol arranging mechanism 4, and a signal name optimization arranging means 52 for giving and arranging the respective corresponding signal names to each of the signal line wiring routes which have been determined. In this state, extending from a terminal pin side of the wiring route to an initial pin side, a sufficient space for arranging the signal name of its wiring route is retrieved, and an optimum position being near the terminal pin side is set as an arrangement position of its signal name. In such a way, a visual discrimination can be executed easily, and the wiring route can also be optimized.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a signal name arrangement determination method, and in particular, to each signal wiring route determined using logic circuit information, the signal name of the wiring route is assigned and arranged. This relates to a signal name arrangement determination method.

For logic circuit diagrams consisting of multiple gate circuits and logic circuit blocks, the designer himself/herself specifies the physical components and cell blocks of the integrated circuit diagram, and displays the signal name of the connection information on the signal line. and generates a logic circuit diagram.

In particular, when a circuit wiring determination method is used using logic circuit information, the wiring pattern may become complicated because other wiring is not taken into consideration.

Various problems arise when assigning and arranging signal names for each wiring on such a complicated wiring pattern.

In other words, when another signal line passes through a signal name placed on a signal line, the signal name and the wiring overlap, making it difficult to visually identify the signal name. Therefore,
If you set the signal name as a wiring prohibited area and prevent other wiring from passing through it, that signal line will search for another route or
This results in a complicated pattern in which only the signal name is avoided, and the wiring length becomes large.

Therefore, the present invention has been made to solve these drawbacks of the conventional technology, and its purpose is to facilitate visual identification and to optimize wiring routes. The object of the present invention is to provide a signal wiring means that can perform the following steps.

According to the present invention, there is provided a signal name placement determination method that assigns and places a signal name of the wiring route to each signal wiring route determined using circuit information, the method comprising: A means is provided to search for a space sufficient to place the signal name of the wiring route from the end pin side to the start end pin side, and as a result of this search, the optimal position close to the end pin side is determined as the placement position of the signal name. A signal name wiring determination method characterized in that the following is obtained.

father-in-law Hereinafter, the present invention will be explained in detail using the drawings.

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

An embodiment of the present invention is an input/output device 1 that inputs and outputs data.
, an arithmetic processing device 2 that performs arithmetic processing on data input by the input/output device 1, a data storage device 3 that stores the processed data, and a logic circuit diagram symbol arrangement 8.
1 horizontal 4 and a logic circuit diagram wiring machine m5.

The logic circuit diagram symbol arrangement mechanism 4 has a function of determining the position on the circuit diagram of each start circuit or logic circuit block constituting the logic circuit diagram, and can use already known circuit technology. Logic circuit diagram wiring machine'! f45 is a signal line wiring means 51 that determines signal line wiring routes between each circuit symbol arranged by the logic circuit diagram symbol placement mechanism 4, and a signal line wiring means 51 that determines signal line wiring routes that correspond to each of the determined signal line wiring routes. and a signal name optimization arrangement means 52 for assigning and arranging names.

FIG. 2 is a flowchart detailing the operation of this logic circuit diagram wiring mechanism 5. Steps 11 to 16 are the operation flow of the signal wiring means 51, and steps 17 to 20 are the operation flow of the signal name optimization arrangement means 52. be. FIGS. 3 and 4 are diagrams illustrating specific examples of embodiments of the present invention.

First, referring to FIG. 3, it is an example of a logic circuit diagram composed of circuit blocks and gate circuits, and the signal names as logical connection information of the pins of the circuit symbol are arranged on the signal lines. In order to avoid signal lines passing over the arranged signal names, the signal lines are routed around. Therefore, the wiring length becomes long and the wiring pattern becomes complicated (h). Due to the arrangement of the signal name (a), the wiring (c) of the adjacent symbol is affected, and even if the connection partner (d) can be wired, unconnected wiring occurs. Also, if you force the wiring to avoid unconnected wires, the signal name will be passed (e
) will result in a wiring route like this.

FIG. 4 is a diagram in which signal names are handled not only as logical connection information of pins of symbols but also as names for signal networks, and signal names are arranged at optimal positions. By moving the signal name in (a) from the position in Figure 3 to the position in Figure 4, the signal line (c
)-('d) route becomes possible to route. Also, signal networks (e) and (h).

−5= By searching for the optimal position in the signal network as in (i),
The circuit diagram becomes visually easy to read. The signal name (g) is also placed near the external terminal (f), making it easier for circuit designers to read.

Next, the operation of the embodiment of the present invention will be explained using the flowchart shown in FIG. Is the starting point and ending point of the connection wiring determined using the symbol arrangement information and interconnection information of the logic circuit? (Step 11) In this case, the starting point of the connection wiring is the fan-out side (signal output side), and the ending point is the fan-out side. In side (signal input side).

The optimal wiring route between these starting points and termination points is searched (
Step 12) The shortest wiring route with as few vertical routes as possible is determined as the optimal wiring route (
Step 13). However, if the optimal wiring route passes over a signal name assigned to another wiring route that has already been determined, it is determined that the route avoids this signal name (step 14). . If the optimum route is determined in this way, the wiring route is determined (step 16), or if not, the processes from step 12 to ]6 are repeated until the wiring route is determined (step 15).

It is necessary to assign a signal name and arrange it for the optimal wiring route 1- determined in this way, and the arrangement position of this signal name is determined in steps 17-20. In other words, from the fan-in pin (which is the end of the wiring route) to the fan-in pin (which is the female junction point from the rule) to the pin side, it is searched whether the position on the wiring route is optimal or the position where the signal name is given. (Step 17), the terminal fan-in pin side (
In Fig. 4, in f), the signal name (SIG3) is set to If the signal name is to be placed in , processing to avoid this is performed (step 18).

In the case of signal names like a, i, and h in Figure 4, in other words, the fan-in side of wiring route 1- is derived to another circuit page (generally, circuit diagrams often span multiple sheets). In the case where the signal name is placed at the end of the wiring route on the same page. In this way, the optimum placement position of the signal name is finally determined (step 20), or if it is inappropriate, the process is restarted from step 17 (step 19).

Effects of the Invention As described above, according to the present invention, it is possible to optimize the signal name placement position of the wiring route in the logic circuit connection information, so it is possible to obtain a circuit diagram that is easy to visually identify. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an operation flowchart of the blocks in FIG. 1, and FIGS. 3 and 4 are circuit diagrams of specific examples explaining the operation of the embodiment of the present invention. be. Explanation of symbols of main parts 51...Signal line wiring means

Claims (1)

[Claims] (1) A signal name placement determination method in which each signal wiring route determined using circuit information is assigned a signal name for that wiring route and placed from the terminal pin side to the starting pin side of the wiring route. A means is provided to search for a space sufficient to place the signal name of the wiring route, and as a result of this search, the optimum position close to the terminal pin side is set as the placement position of the signal name. signal name placement determination method.