JPH11126955A - Semiconductor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a semiconductor device from which the number of used parts can be reduced. SOLUTION: A semiconductor device is provided with an arithmetic processor having an arithmetic processing function, a connector connected to the output terminal of the arithmetic processor, and a printed board 3 on which peripheral circuits having at least storing functions and can be controlled by means of the arithmetic processor are mountable. On the printed board 3, an area 2 on which the connector is mountable is formed in such a state that at least part of the area 2 is opened on the outer periphery of an area on which the arithmetic processor is mountable and at least part of the peripheral circuit area 4 on which the peripheral circuits are mountable is formed in the opened part of the area 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a printed circuit board. More specifically, the present invention relates to a semiconductor device capable of increasing a region where a peripheral circuit such as an IC can be mounted.

[0002]

2. Description of the Related Art In a semiconductor device on which an arithmetic processing device such as an FPGA can be mounted, as shown in FIG. 2, the arithmetic processing device is arranged so as to surround an outer periphery of a region 11 in which a substantially square arithmetic processing device is mounted. Conventionally, a semiconductor device using a printed circuit board 13 on which a connector mounting area 12 is formed has been generally used so that a connector can be mounted at a position facing each side of the outer periphery of the mounting area 11.

In the conventional semiconductor device, various functions such as a memory function, an A / D conversion function, and a D / A conversion function are provided by a memory, an A / D converter, and a D / A converter, respectively.
A board on which components such as a converter are mounted is electrically connected to the printed circuit board 13 from outside the printed circuit board 13, and a control circuit for controlling these is also mounted on another printed circuit board and connected to the printed circuit board 13 via wiring. Have been.

[0004]

However, when a component for performing various functions and a means for connecting a control circuit for controlling the component are used as in the prior art, a separate component is added every time the user adds a desired function. And a control circuit must be added, and the number of parts increases. Further, as the number of components increases, the number of wirings connected from the outside to the printed circuit board on which the arithmetic processing device is mounted increases, so that there is a problem that noise and the like are generated and electrical characteristics are deteriorated.

Further, as described above, when a memory function is added to a printed circuit board on which an arithmetic processing unit is mounted, a memory control circuit corresponds to a specific memory. When a memory is connected to a printed circuit board on which an arithmetic processing unit is mounted, a corresponding control circuit is required, and there is a problem that the number of components is further increased.

The present invention has been made to solve the above problems, and has as its object to provide a semiconductor device capable of reducing the number of components used.

[0007]

According to a first aspect of the present invention, there is provided an arithmetic processing apparatus having an arithmetic processing function, and an apparatus connected to an output terminal of the arithmetic processing apparatus. And a printed circuit board 3 having at least a storage function and capable of mounting a peripheral circuit which can be controlled by the arithmetic processing unit. At least a part of the peripheral circuit area 4 on which the peripheral circuit can be mounted is formed so that at least a part is opened at the outer periphery of the area 1 where the device can be mounted. It is characterized by. As described above, since the peripheral circuit can be controlled by the arithmetic processing device, a separate control circuit is not required for controlling the peripheral circuit as in the related art, so that the number of components can be reduced.

In addition, an area 2 on which a connector can be mounted is formed on the printed circuit board 3 at an outer periphery of an area 1 on which an arithmetic processing device can be mounted, so that at least a part of the area is open.
Peripheral circuit area where peripheral circuits can be mounted on the open part
Since at least a part of 4 is formed, an arithmetic processing unit and peripheral circuits can be mounted on the same printed circuit board 3.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing one embodiment of a printed circuit board according to the present invention. In FIG. 1, reference numeral 1 denotes an area in which an arithmetic processing device such as an FPGA can be mounted (hereinafter simply referred to as an arithmetic processing device mounting area);
Denotes an area (hereinafter simply referred to as a connector mounting area) which is connected to an output terminal of the arithmetic processing unit and in which a connector from which an output of the arithmetic processing unit can be taken out can be mounted. Here, the connector mounting area 2 is formed so as to face the outer periphery of the processing device mounting area 1 which is formed in a substantially square shape, but one side (the lower side in FIG. 1) is formed by the connector mounting area 2. It is open without being formed.

Reference numeral 4 denotes a peripheral circuit area in which a peripheral circuit controllable by an arithmetic processing unit can be mounted. The peripheral circuit area 4 includes, for example, an area 4a for mounting a buffer IC for temporarily storing and increasing a signal to a memory, an area 4b for mounting an SRAM serving as a memory, and a SIM.
Area 4c for mounting M, area for mounting D / A conversion element,
An area where the A / D conversion element is mounted may be used.

Then, the above-mentioned arithmetic processing unit mounting area 1,
The connector mounting area 2 and the peripheral circuit area 4 are both formed on a single printed circuit board 3. As described above, since an arithmetic processing unit and peripheral circuits that can be controlled by the arithmetic processing unit can be mounted on one printed circuit board 3, a control circuit for controlling the peripheral circuits as in the related art is separately required. Without
Therefore, the number of parts can be reduced.

In addition, a connector mounting area 2 is formed so as to face three sides of a substantially square outer periphery of the arithmetic processing apparatus mounting area 1, and a connector mounting area 2 is formed on one side of the arithmetic processing apparatus mounting area 1. The peripheral circuit 4 in the open area on the outer periphery of the arithmetic processing unit mounting area 1.
For example, the region 4a for mounting the buffer IC can be formed.

The arithmetic processing unit mounted on the semiconductor device thus formed is programmed so as to be able to control peripheral units, for example, the above-described SRAM and SIMM. In addition, since a component having a memory function can be sufficiently mounted on a single printed circuit board as described above, it can be applied to applications requiring a large amount of memory, such as image processing.

Therefore, in the arithmetic processing unit, the program is configured to perform the arithmetic processing function, the floating-point arithmetic function, the control function of the peripheral circuit, etc., so that the number of parts can be reduced extremely easily as compared with the conventional one. A device can be formed.

Further, in the arithmetic processing device according to the present invention, it is possible to control different types of memories by simply changing the program in the arithmetic processing device without adding any components such as a control circuit. Is possible. Therefore, irrespective of an increase in the type of memory, the number of components related to the control circuit for controlling the memory is constant (only the arithmetic processing device). That is, the number of parts constituting the semiconductor device can be reduced as compared with the related art, and the effect of maintaining good electrical characteristics in the semiconductor device can be obtained.

In the above-described embodiment, one side of the substantially square outer periphery of the processing unit mounting area 1 is opened so as to face three sides, in other words, one side of the substantially square outer periphery of the processing unit mounting area 1. So that the connector mounting area
2 is formed, but if the connectors are arranged so that necessary output terminals of the processing unit can be taken out, the connector mounting area is formed on two or less sides of the substantially square outer periphery of the processing unit mounting area 1. May be.

[0017]

According to the semiconductor device of the present invention, since the peripheral circuit can be controlled by the arithmetic processing unit, there is no need for a separate control circuit for controlling the peripheral circuit as in the prior art. Can be reduced.

[0018] In addition, an area on the printed circuit board on which a connector can be mounted so that at least a part of the area is open, and a peripheral circuit is mounted on the open area. Since at least a part of the possible peripheral circuit area is formed, the arithmetic processing unit and the peripheral circuit can be mounted on the same printed circuit board.
Accordingly, an effect that good electrical characteristics in the semiconductor device can be maintained can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a printed circuit board according to the present invention.

FIG. 2 is a plan view showing an example of a conventional printed circuit board.

[Explanation of symbols]

1 Computing device mounting area 2 Connector mounting area 3 Printed circuit board 4 Peripheral circuit area

Continued on the front page (72) Taihei Yamamoto, Inventor 436-5 Ichijokami, Tatemachi, Higashihorikawa-dori, Kamigyo-ku, Kyoto-shi 5 Photographic Chemistry Co., Ltd.

Claims (1)

[Claims] An arithmetic processing device having an arithmetic processing function, a connector connected to an output terminal of the arithmetic processing device, and a peripheral circuit having at least a storage function and controllable by the arithmetic processing device can be mounted. Area where the connector on the printed circuit board (3) can be mounted.
(2) is formed so that at least a part thereof is opened on the outer periphery of the area (1) where the arithmetic processing device can be mounted,
A semiconductor device characterized in that at least a part of a peripheral circuit area (4) on which a peripheral circuit can be mounted is formed in the open part.