JPS6385975A - Cad system - Google Patents

Abstract

PURPOSE:To design a large scale gate array by using a design editor extracting and connecting a function module required for a large scale integrated circuit from a CAD library, an input means for respective required information, and a display means for successively display. CONSTITUTION:The function modules of peripheral circuits 15, 16 corresponding to 82C59, 82C53 more than 10K gate having an equal function to the peripheral circuit of a CPU, peripheral circuits 17-19 corresponding to cascade connected 82C37 and a random part 20 are stored in the CAD library 1. When the respective information of a large scale gate array desired to be designated is inputted to a console 7, the design editor 4 extracts the required module from the CAD library 1. The extracted modules are connected according to respective design rules stored in a design data base 3. The simulation of the circuit is carried out according to the instruction of the console 7. The respective function modules are laid out by a pattern editor 5 and a partial correction is executed. In such a way, a final wiring pattern can be displayed on the screen of a display 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a CAD system used when designing large-scale integrated circuits such as gate arrays.

(Prior art) Conventionally, when designing a gate array using a CAD system, a gate circuit with a relatively small number of gates (2 or 3 gates) (hereinafter referred to as a function module) is stored in a CAD library set by the manufacturer. The process is to appropriately combine the following:

By the way, in conventional CAD systems, the number of function modules that can be combined is limited, and it is not possible to combine circuits including CPU peripheral circuits into one gate array. Custom LSIs were designed using the methods of designing full-custom ICs.

In addition, in conventional CAD systems, for the same reason, DM
A circuit in which peripheral circuits such as A are connected in cascade cannot be directly converted into an LSr, and the LSI must be divided into multiple pieces.

Under these circumstances, when designing gate arrays and LSIs using conventional CAD systems, there has been a problem in that a great deal of time and expense is required for design and product evaluation.

In the future, SOG (Sea-Of-Gates)
It is certain that ultra-large-scale gate arrays such as , it is expected that the design will require a huge amount of effort.

(Problems to be Solved by the Invention) The present invention has been made in view of the circumstances described above.
The purpose of the present invention is to provide a CAD system that facilitates the design work when designing gate arrays and LSIs using an AD system, and that can also handle the design of fairly large-scale gate arrays.

[Structure of the Invention] (Means for Solving the Problems) The CAD system of the present invention includes a CAD library pre-stored with a plurality of function modules having functions equivalent to a peripheral circuit of a CPU, and a large-scale integrated circuit. A design editor that extracts and combines function modules necessary for construction from the CAD library, an input means for inputting various information necessary for construction of the large-scale integrated circuit, and a sequential display of the large-scale integrated circuit that is being constructed. and display means.

(Function) In the CAD system of the present invention, the peripheral circuit of the CPU is configured as one function module in the CAD library, and when the design editor combines them based on each piece of information input from the input means, Despite the small number of functional modules combined, fairly large gate arrays can be constructed.

(Example) Hereinafter, details of embodiments of the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing the configuration of a system according to an embodiment of the present invention.

In the figure, 1 is a CAD library that stores information indicating each design standard and circuit elements such as symbols and circuit parts, and 10 has function modules of gates or higher that have functions equivalent to CPU peripheral circuits; is a CAD library editor that performs additional registration and modification of the contents of CAD library 1, 3 is drawing data,
4 is a design database that stores logic data, wiring pattern data, simulation data, etc., 4 is a design editor that constructs a circuit diagram using an interactive input method, makes corrections as necessary, and executes logic simulation, etc.; There is a pattern editor for arranging each component and wiring each part using an interactive input method, a display 6 for displaying various displays, and a console 7 for performing various inputs.

In the system of this embodiment, a large number of function modules are stored in the CAD library 1 in advance.

As mentioned above, these function modules are
It is a module with more than 10 gates and has a function equivalent to a peripheral circuit of a CPU, and has a scale of more than 10 gates.

In the system of this embodiment, when the operator views various information of the large-scale gate array that he/she wants to design through the console 7, the design editor 4 extracts the necessary function modules from the CAD library 1, and stores the extracted function modules in the design database 3. Combine according to each stored design rule. The circuit diagram of the large-scale gate array is successively displayed on the screen of the display 6.

Roughly, the designed circuit is simulated according to predetermined instructions from the console 7, each function module is appropriately laid out using the function of the pattern editor 5, and partial corrections are made as necessary. The final wiring pattern will be displayed on the screen.

According to the system of this embodiment, it is possible to design a gate array equivalent to the circuit shown in FIG. 2, for example.

This circuit is a commercially available peripheral circuit equivalent to 82037, 11.82C peripheral circuit equivalent to 12.82C59.
Peripheral circuit 13 equivalent to 53, and random section 1
It consists of 4, and is controlled by an external control signal.
These work.

In conventional CAD systems, the number of function modules that can be combined is limited.
It was possible to create a gate array only for the part shown in
In the system of this embodiment, the CAD library 1 stores function modules that have been designed in advance and have undergone predetermined verification, and have functions equivalent to those of the peripheral circuits 11 to 13. Therefore, the number of function modules that can be combined is stored in the CAD library 1. Even though the number of gates is small, the entire area up to the part shown by B in the figure can be formed into a gate array.

FIG. 3 is a diagram showing an example of a circuit that can be formed into a gate array by a system according to another embodiment of the present invention.

This embodiment system has the same configuration as the system shown in FIG. 1, but the CAD library 1 is
In addition to a plurality of function modules having functions equivalent to those of the peripheral circuits, a function module in which these function modules are connected in cascade is held in advance.

The circuit shown in Figure 3 is a commercially available peripheral circuit 15 equivalent to 82C59.
6. Cascade-connected peripheral circuits 17, 18, and 19 corresponding to each 82037, and random section 20
These components are operated by external control signals.

With conventional CAD systems, it was only possible to create gate arrays for the parts shown in the figure due to the limit on the number of function modules that could be combined.
In the system of this embodiment, in addition to a function module having a function equivalent to peripheral circuits 15 and 16, a function module in which peripheral circuits 17 to 19 are connected in cascade, which have been designed in advance and has gone through prescribed verification, is stored in the CAD library 1. Therefore, even though the number of function modules to be combined is small, the entire area up to the part shown at E in the figure can be formed into a gate array.

In each of the above-mentioned embodiments, the case where the system of the present invention is used to design a large-scale gate array has been explained, but the system of the present invention can also be applied to standard cells or other custom LSIs.
It can also be applied to the design of

[Effects of the Invention] As explained above, the CAD system of the present invention uses the CPU
Since the peripheral circuits are configured as one function module in the CAD library, HQ work is extremely easy when designing gate arrays and LSIs, and it can also be used to design fairly large-scale gate arrays. It is.

It is possible to roughly reduce the time and cost of development evaluation,
This not only makes it possible to simplify the development tools (particularly the manufacturing process), but also makes it possible to downsize the system including the ICs surrounding the CPU and the gate array.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a system according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of a circuit that can be formed into a gate array using the system according to the embodiment, and FIG. FIG. 2 is a circuit diagram showing an example of a circuit that can be formed into a gate array using the embodiment system. 1... CAD library 2...
・・・CAD library editor 3・・・・・・・・・
Design database 4...Design editor 5...Pattern editor 6...
...Display 7...Console applicant Toshiba Corporation Patent attorney Satoshi Suyama - Figure 1 5 Figure 2 Figure 3

Claims (3)

[Claims] (1) CAD that pre-stores multiple function modules with functions equivalent to CPU peripheral circuits
a design editor for extracting and combining function modules necessary for constructing a large-scale integrated circuit from the CAD library; input means for inputting various information necessary for constructing the large-scale integrated circuit; A CAD system comprising display means for sequentially displaying large-scale integrated circuits. (2) The CAD system according to claim 1, wherein the CAD library holds, in addition to a plurality of function modules having functions equivalent to a peripheral circuit of a CPU, a function module in which these function modules are connected in cascade. (3) The CAD system according to claim 1 or 2, wherein each of the function modules has a number of gates of 1 OK gate or more.