JPH1117014A - Field programmable gate array structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a field programmable gate array structure of high working efficiency by a method wherein programmable wiring regions are provided on the circumferential part of a substrate in such a manner that they can be programmably connected between each logic module and between each module and an input/output circuit logic module. SOLUTION: A logic module 2 of a small number of input variables, a logic module 3 of an intermediate number of input variables and a logic module 4 of a large number of input variables are arranged in matrix form in an excellently wiring-balanced manner, and an input/output circuit logic module 5 is provided between the above-mentioned logic modules 2, 3 and 4 and on the circumferential part of them. A programmable wiring region 6 is provided on the circumferential part of a substrate in such a manner that between the logic modules 2, 3 and 4 and the input/output circuit logic module 5 can be programmably connected. As a result, a high-speed circuit, having little affection of the delay caused by the programmable wiring which connects between the logic modules, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field programmable gate array structure.

[0002]

2. Description of the Related Art A conventional field-programmable gate array structure has a configuration in which a plurality of logic modules of one type of input variable are arranged in an array or a configuration in which different types of logic modules are flexibly connected. Had been.

[0003]

In the above-mentioned conventional field programmable gate array structure composed of logic modules having a small number of input variables, when a combinational circuit having a large number of input variables is realized, a circuit extending over a plurality of logic modules is required. Therefore, the programmable wiring structure that connects the logic modules increases the rate of wiring delay, making it difficult to realize a high-speed circuit.

In a field-programmable gate array structure composed of logic modules having a large number of input variables, when a circuit having a small number of input variables of a combinational circuit is to be realized, the logic module is wasted, resources are wasted, and the use efficiency is low. There was a problem.

An object of the present invention is to realize a high-speed circuit and a field-programmable gate array structure with high use efficiency.

[0006]

According to the field programmable gate array structure of the present invention, a logic module having a small number of input variables including a sequential circuit in an output stage, a logic module having an intermediate input variable and a logic module having multiple input variables are respectively wired. The input / output circuit logic modules are arranged in a well-balanced matrix, and the logic modules for the input / output circuits are arranged between the logic modules and in the peripheral area. The programmable wiring area is programmable between the logic modules and between these logic modules and the logic module for the input / output circuit. And provided on the peripheral portion of the substrate so as to be connectable to the substrate.

In the field programmable gate array structure, the number of inputs of a logic module having a small number of input variables is 1 to 5, the number of inputs of a logic module having an intermediate input variable is 6 to 10, and a logic module having a number of input variables is provided. 1
The number is preferably 1 to 20.

In the field programmable gate array structure, the logic modules of each input variable are arranged in order from the leftmost column to the rightmost column on the substrate in order of small, medium, many, many, medium, small,
It is also preferable that the same number of modules in each row is arranged in the order of the logic modules of each of the small, medium, many, many, medium and small input variables and in each column.

The present invention is characterized in that a multi-input variable, a medium-input variable, and a small-input variable programmable logic module are arranged in a well-balanced manner, thereby realizing a high-speed circuit and using a field-programmable gate array having a high use efficiency. Is provided.

[0010] By arranging logic modules of small input variables, medium input variables, and multiple input variables in a well-balanced manner according to the input variables of the combinational circuit, a combinational circuit having many input variables between sequential circuits in the user circuit. Increases the ratio that can be realized by one logic module of multiple input variables. In the case of a combinational circuit having a small number of input variables, a logic module having a small number of input variables can be selected and used without wasting resources provided by the logic module. A high circuit can be realized.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic plan view of one embodiment of a field programmable gate array structure 1 of the present invention.
FIG. 2A is an enlarged circuit diagram of an embodiment of the logic module 2 having a small number of input variables in FIG. 1, and FIG. 2B is an embodiment of the logic module 3 having a middle input variable in FIG. FIG. 3C is an enlarged circuit diagram of an embodiment of the multi-input variable logic module 4 in FIG. 1.

FIG. 1 shows a field-programmable logic circuit comprising a logic module having a plurality of input variables according to the present invention.
An example of an embodiment of a gate array structure 1 is shown, as shown in FIG. 1, a logic module 2 for small input variables, a logic module 3 for intermediate input variables, and a logic module 4 for multiple input variables.
Are arranged in a matrix with good wiring balance, the input / output circuit logic module 5 is arranged between the logic modules 2, 3, 4 and in the peripheral part, and the programmable wiring area 6 is arranged in each logic module 2, 3,. 4 and the respective logic modules 2, 3, 4 and the input / output circuit logic module 5 are provided at the periphery of the substrate so as to be programmably connectable.

2 (a), 2 (b) and 2 (c)
As an example of the field programmable gate array structure 1 of the present invention, the number of inputs of the logic module 2 having a small number of input variables is four, and the number of inputs of the logic module of an intermediate input variable is nine.
And 15 multi-input variable logic modules are shown.

FIG. 1 shows a field programmable device.
As the gate array structure 1, the logic modules 2, 3, and 4 of each input variable are arranged on the substrate from the leftmost column to the rightmost column in the order of small 2, medium 3, many 4, many 4, medium 3, small 2, small An example is shown in which logic modules of each of the input variables 2, 3, 3, 4, 4, 3 and 2 are arranged in that order, and 14 modules in each column are arranged.

According to the present invention, as described above, according to the input variables of the combinational circuit, the programmable logic module 2 having a small input variable, a medium input variable, and a multiple input variable,
3 and 4 are arranged in a well-balanced manner, and are used to programmably interconnect each of the input variable logic modules 2, 3, and 4 and between each of the logic modules 2, 3, and 4 and the input / output circuit logic module 5. Since the programmable wiring region 6 is provided, the ratio of a combinational circuit having a large number of input variables between sequential circuits in the user circuit can be realized with a single logic module having a large number of input variables. Further, in the case of a combinational circuit having a small number of input variables, a logic module having a small number of input variables is selectively used, so that the resources of the logic module can be used without wasting. Therefore, a high-speed circuit can be easily realized, and a circuit with high use efficiency can be realized.

[0017]

According to the present invention, a plurality of logic modules 2-4 having different input variables are arranged in a well-balanced manner so as to be selectively used. , The optimal input variable logic modules 2 to 4 can be selected.
Since the resources in the logic modules provided in the field programmable gate array structure 1 can be used efficiently, and the combination circuit between the sequential circuits can be realized by one logic module at a high rate, the programmable wiring connecting the logic modules is increased. Thus, there is an effect that a field-programmable gate array structure capable of realizing a high-speed circuit with less influence of delay caused by the delay can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of one embodiment of a field programmable gate array structure 1 of the present invention.

FIG. 2A is an enlarged circuit diagram of an embodiment of the logic module 2 having a small number of input variables in FIG. 1, and FIG.
1 is an enlarged circuit diagram of an embodiment of the logic module 3 for middle input variables, and FIG. 2C is an enlarged circuit diagram of an embodiment of the logic module 4 for multiple input variables of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Field programmable gate array structure 2 Logic module of small input variables 3 Logic module of medium input variables 4 Logic module of multiple input variables 5 Logic module area for input / output circuits 6 Programmable wiring connection area between logic modules 7 Input section 8 Output unit 9 Combination circuit unit for multiple input variables 10 Sequential circuit

Claims (3)

[Claims] In a field programmable gate array structure, a logic module having a small number of input variables including a sequential circuit in an output stage,
The logic modules of the intermediate input variables and the logic modules of the multi-input variables are arranged in a matrix with good wiring balance, and the logic modules for the input / output circuits are arranged between the logic modules and in the peripheral portion, and the programmable wiring area is A field-programmable gate array structure, which is provided on a peripheral portion of a substrate so as to be programmably connectable between logic modules and between each logic module and the logic module for the input / output circuit. 2. The logic module having a small number of input variables has 1 to 5 inputs, the logic module having an intermediate input variable has 6 to 10 inputs, and the logic module having multiple input variables has 11 to 20 logic modules. 2. The field programmable gate array structure of claim 1, wherein the gate array structure comprises: 3. The logic module of each of the input variables includes a small, medium, many, many, middle,
2. The field programmable gate array according to claim 1, wherein the logic modules of each of the small, small, medium, large, large, medium, and small input variables are arranged in the order, and ten or more modules in each column are arranged in the same number. Construction.