JPS6350999A - Electronic device - Google Patents

Abstract

PURPOSE:To easily realize the various types of logical functions by providing plural logic units and a fuse for specifying the connection relation between the logic units. CONSTITUTION:Sockets for disposing the logic units such as a PLA, a PROM, a MSI are disposed and wirings 102 are provided vertically and laterally between these sockets. At the cross position of the wirings 102, a wiring switching device 101 is disposed. In this switching device 101, the plural fuses, for instance, fuses 301a, 301b for specifying the connection relation are provided. Herein, by fusing the fuse 301a, the wiring can be switched. In such a way, the specific fuse of the fuses incorporated in an electronic device is fused, thereby, the various types of the logical functions can be easily realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic device in which internal wiring can be freely configured as necessary to realize various logical functions.

BACKGROUND OF THE INVENTION Generally, in the middle of LSI development, a prototype circuit board is often created for real-time functional verification. However, since LSIs usually have a large scale of integration and a large amount of built-in logic circuits, creating an equivalent circuit board requires a great deal of time, money, and manpower. Prototype circuit boards are often implemented by combining many small scale standard logic devices, ie SSI or MSI.

Circuit boards constructed in this manner tend to have a large board area and large number of boards, and it is difficult to modify the circuits.

FR is used to compensate for the problems of SSI and MSI.
Fused logic devices such as OM (Programmable Read Only Memory) or PLA (Programmable Logic Array) were used. In this method, after manufacturing a logic device, only specific fuses built into the logic device are blown externally according to the logic function required by the user to obtain the desired logic circuit.

By using a fuse-type logic device such as FROM or PLA, it has become possible to reduce the board area of a prototype circuit board.

FIG. 5 shows an example of a circuit of a conventional prototype circuit board using PROM, PLA, SSI, MSI, etc. In the figure, 9a to 9e are PROM5PLA.

Logical devices such as SSI and MSl, with specific connections defined between these logical devices. This specific connection between the logic devices is realized in the form of specific wiring on the prototype circuit board, and the desired logic function is obtained.

The problem that the invention aims to solve However, in the above configuration, PROM.

Since the connection relationship between logic devices such as PLA, 331, and MSI is realized by specific wiring, wiring implementation work such as wire wrapping, soldering, and wiring printing is first required. Since most of these tasks are performed manually, they require a lot of time and are inevitably subject to errors.

In view of the above-mentioned problems, the present invention provides an electronic device in which internal wiring can be freely arranged in order to realize various logical functions.

Means for Solving the Problems In order to solve the above problems, the electronic device of the present invention includes a plurality of logic devices and a fuse that defines the connection relationship between these logic devices.

Operation According to the present invention, with the above-described configuration, various logical functions can be easily realized by blowing out specific fuses built into an electronic device through a special external interface.

Embodiment Hereinafter, an electronic device according to an embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 4, the same reference numerals indicate the same or corresponding parts. FIG. 1 shows an electronic device according to an embodiment of the present invention. In FIG. 1, 101 is a wiring exchange device, and 102 is a pre-installed wiring. This electronic device has P
Sockets for installing logic devices such as LA, PROM, and MSI are arranged, and wiring is provided vertically and horizontally between these sockets. Wire exchange devices are placed at the intersections of the wires, so that the wires can be replaced as desired. FIG. 2 shows an example of the configuration of the wiring exchange device. In the figure, 201a to 201-1202a to 202e are contacts provided with fuses that define connection relationships.

The wiring replacement device shown in the figure can replace a total of eight wires, two in each of the four directions. By blowing out a specific one of the fuses that define the connection relationship, any wiring replacement can be performed.

FIG. 3 fa+ shows an example of the structure of the contacts of the wiring exchange device.

In the figure, 301a is a blown fuse, 301b
indicates fuse. At this time, there is no connection relationship between the signal line 302 and the signal line 303, and a connection relationship exists between the signal line 302 and the signal line 304. This state will be represented by the intersections 201a and 202a (in FIG. 3) with O marks and ■ marks, respectively.

Next, FIG. 4 fal shows an actual wiring replacement using the circuit shown in FIG. 3 above. 20 in Figure 4(a)
1a to 201e are intersections where fuses are blown, and connections exist only at intersections 202a to 202w. Therefore, in the case of the fuse pattern shown in Fig. 4(a),
(This is equivalent to the wiring in bl.

Effects of the Invention As described above, the present invention includes a plurality of logic devices and fuses that define connection relationships between these logic devices, so that a specific one of the fuses built into an electronic device can be Various logic functions can be realized by fusing through a special external interface.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an electronic device in an embodiment of the present invention;
Figures 2 and 4 are configuration diagrams of the wiring exchange device in Figure 1, and Figure 3
This figure is a circuit diagram of the contact shown in FIG. 2, and FIG. 5 is a circuit diagram of a conventional electronic device. 10L 204... Wiring exchange device, 102...
... Wiring, 103a to 103g -- Logic element group, 2
01a~201w, 202a~202e...
・Intersection, 303a...Fused fuse, 3
03b...Fuyuse, 302-304...
··Signal line.

Claims (1)

[Claims] 1. An electronic device comprising a plurality of logic devices and a fuse that defines a connection relationship between these logic devices, the fuses being able to be blown externally.