JPS6349831A - Electronic equipment - Google Patents

Abstract

PURPOSE:To realize various types of logic functions just by rewriting the contents of a built-in memory element after adding plural logic devices and a memory element that prescribes the connecting relation among those logic devices. CONSTITUTION:The wirings are provided vertically and horizontally among those sockets set for such logic devices as a programmable logic array PLA, programmable read-only memory PROM, a MIS, etc. Then the wiring exchange devices are set at the crossing areas of those wirings and therefore the wirings can be optionally exchanged with each other. This wiring exchange device serves as a memory element which stores the connecting relation of logic devices. Thus the wirings can be optionally exchanged by rewriting the storage contents of the memory element. Thus it is possible to easily realize various types of logic functions.

Description

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

In conventional technology-i, a prototype circuit board is often made in the middle of developing an LSI to perform real-time functional verification. However, since LSIs usually have a large scale of integration and a large amount of built-in logic circuits, it takes a great deal of time, money, and manpower to produce an equivalent circuit board. Prototype circuit boards are often implemented by combining many small scale standard logic devices, ie SSI or MSI. Circuit boards constructed in this way tend to have a large board area and large number of boards, and
It is difficult to modify the circuit.

Such SS1. Phased logic devices such as PR<)M (Programmable Read Only Memory) or PLA (Programmable Logic Array) have been used to compensate for the problems of MSI. In this method, after manufacturing a logic device, only a specific one of the built-in phases of the logic device is fused externally according to the logic function required by the user to obtain the desired logic circuit.

By using a phase 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, 331, MSI, etc. In the figure, 9a to 9e are PROM and PLA.

Logical devices such as SSI and MSI, 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 relationships between logic devices such as PLA, SSI, and MSI are 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.

Another drawback is that once the wiring is done, it is difficult to make significant changes to the logic.

In view of the above-mentioned problems, the present invention provides an electronic device whose internal wiring can be freely rearranged as necessary to realize various logical functions.

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

Effect of the Invention With the above-described configuration, the present invention allows various logical functions to be easily realized by externally rewriting the memory contents of the memory element built into the electronic device.

Embodiment Hereinafter, an electronic device according to an embodiment of the present invention will be described with reference to the drawings. The same reference numerals in FIGS. 1 to 4 indicate the same or corresponding parts. FIG. 1 shows an electronic device in one embodiment of the present invention. In Figure 1, 1 is a wiring exchange device, 2 is a pre-attached wire, and 0.
.

Sockets for installing logic devices such as FROM 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. Second
The figure shows an example of the configuration of a wiring exchange device.
1w, 2a to 2e are contacts equipped with a memory element for storing connection relationships. The wiring replacement device shown in the figure can replace a total of eight wires, two in each of four directions. By rewriting the memory contents of the memory element that stores the connection relationships, arbitrary wiring replacement can be performed.

FIG. 3 (al) shows an example of the configuration of the contacts of the wiring exchange device.

In the figure, lla and llb are flip-flops that store connection relationships, and 12a and 12b are gates that open and close according to the output values of the flip-flops lla and llb. The output of the flip-flop lla is logic "0", and since the gate 12a is closed at this time, no connection is established. I will represent it with a mark.

On the other hand, the output of the flip-flop llb is logic "1", and at this time, the gate 12b is in an open state, so that the connection relationship is established. This state is shown in FIG. 3 (by adding an O mark like the intersection lb of bl).

Next, using the circuit shown in Fig. 3 above, actual wiring replacement is shown in Fig. 4+a+. They are combined into one shift register 15.The output of each bit of this shift register 15 is connected to the intersection point corresponding to the number, and each constitutes the circuit shown in FIG.

For this shift register 15, the shift input terminal 12
When a bit pattern as shown in FIG. 4 fa+ is input using the shift clock terminal 13, the logic "1'
A connection relationship occurs only between 2a to 2e corresponding to the bit outputting , and no connection relationship occurs at each intersection of 1 a = 1 w. Therefore, the bit pattern fa+ in FIG. 4 is equivalent to the wiring in FIG. 4 (bl).

By changing the bit pattern input to the shift register 15, other wiring connections can be realized. Also,
The shift output terminal 14 is used for reading out the contents written in the shift register 15 and for connection with a shift register of another wiring exchange 6.

Effects of the Invention As described above, the present invention is equipped with a plurality of logic devices and a memory element that defines the connection relationship between these logic devices. logical functions can be realized.

[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. 1.4...Wiring exchange device, 2.31-38...
...Wiring, 1 a ~ 1 w, 2 a ~ 2 e
...-intersection, lla. itb...flip 7 flop, 12a, 12
b...Gate. Name of agent Patent attorney Toshio Nakao One idiot Figure 3 ((a, (b-JhLMEMtv I111U2So,
7su D-, 7-zuri a, l2b---74-ton γ sheet (CL) (
Figure 4Figure 4

Claims (1)

[Claims] What is claimed is: 1. An electronic device comprising: a plurality of logic devices; and a memory element that defines a connection relationship between these logic devices; and a rewriting means for externally rewriting the contents of these memory elements.