JPH0555904B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transfer device, and particularly to an improvement in a data transfer device that connects a plurality of logical devices and transfers data.

[Conventional technology]

Generally, a data processing system is composed of logical devices such as a main memory, an arithmetic unit, an input/output device, and the like. A data transfer device that connects these logical devices to each other and transfers data satisfies the connection conditions of each logical device and allows the data processing system to function as a whole.

Such a data transfer device can be easily realized as a dedicated device for connecting a specific logical device. However, even if the logical devices have the same function, if the types of data corresponding to the pins of the cables connecting the logical devices are different, the data transfer device cannot be used at all. That is, in the above case, there is a drawback that a new connection cable suitable for the logic device must be created, or a circuit package with a modified circuit configuration connected to the pins of the cable must be prepared. This increases the number of man-hours for design and manufacturing, and further complicates parts management and maintenance management.

[Problem that the invention seeks to solve]

The problem to be solved by the present invention, in other words, the purpose of the present invention is to provide a data transfer device that improves the above-mentioned drawbacks by making it possible to easily change the type of data corresponding to the pin of the connection cable. It is about providing.

[Means for solving problems]

The data transfer device of the present invention is a data transfer device that connects and transfers data between a plurality of logical devices such as a main storage device, an arithmetic unit, an input/output device, etc. a control circuit that sends out a control signal that sets the type of data corresponding to each of a plurality of pins of a connection cable that connects the device; and a type of data that corresponds to each of the pins according to the control signal. and a direction switching circuit that switches the transfer direction of the data according to the control signal.

〔Example〕

Hereinafter, a data transfer device according to the present invention will be explained with reference to the drawings.

FIG. 1 is a conceptual diagram showing the configuration of a data transfer device according to the present invention. In the figure, a data transfer device 1 transfers data A and B to connection pins P ₁ , P ₂ to Pn.
A data selection circuit 2 for changing the connection of ~N, connection pins _P1 , _P2 , a direction switching circuit 3 for switching the transfer direction of data A, B~N for ~Pn, a connection pin
It is composed of a control circuit 4 that controls the data selection circuit 2 and the direction switching circuit 3 according to the connection of data A, B to N corresponding to P ₁ , P ₂ to Pn. There is. Therefore, the data transfer device 1 connects the connection pins P ₁ and P ₂ according to the control circuit 4.
~Pn can be connected to data A, B~N in different arrangements.

FIG. 2 is a block diagram showing one embodiment of the present invention. In the figure, a data transfer device 10 includes a first selection circuit 11, a second selection circuit 12, and a first switching circuit 1.
3, second switching circuit 14 and mode register 1
5.

The first selection circuit 11 inputs the data signals A and B, selects either the data signal A or B according to the selection signal 101, and sends it to the connection pin _P1 . Similarly, the second selection circuit 12 receives data signals sent out by a first switching circuit 13 and a second switching circuit 14, which will be described later, and selects and sends out the data signal C according to the selection signal 101.

The first switching circuit 13 receives the data signal B and sends it to the connection pin P ₂ according to the switching signal 102. At the same time, the data signal present at the connection pin _P2 is constantly sent to the second selection circuit 12. The second switching circuit 14 also receives the data signal A and sends it to the connection pin P ₃ in accordance with the selection signal 101.
At the same time, the data signal present at the connection pin _P3 is constantly sent to the second selection circuit 12.

Note that the driver D and the receiver R are buffer amplifiers that transmit and receive data signals, respectively.

Mode register 15 connects connection pins P ₁ , P ₂ and
Change its contents and set it according to the logical device connected to _P3 . In the case of the same figure, mode register 15
can set two conditions: ON or OFF.

FIG. 3 is an explanatory diagram showing the operation of the data transfer device 10 described above. In the figure, mode register 1
5 is OFF, data signals A, B and C are present at the connection pins P ₁ , P ₂ and P ₃ respectively. That is, at that time, the selection signal 101 becomes "0" and the switching signal 102 becomes "1", so the first selection circuit 11
selects the data signal A and sends it to the connection pin P ₁ , the first switching circuit 13 sends the data signal B to the connection pin P ₂ , the second switching circuit 14 and the second selection circuit 12 select the data signal Associate C with connection pin _P3 .

Furthermore, when the mode register 15 is ON, the connection pins P ₁ , P ₂ and P ₃ are connected to the data signal B, respectively.
C and A are evident. That is, at that time, the selection signal 101 becomes "1" and the switching signal 102 becomes "0", so the first selection circuit 11 selects the data signal B and sends it to the connection pin P ₁ , and the second switching circuit 14 sends the data signal A to the connection pin P ₃ , and the first switching circuit 13 and the second selection circuit 12 associate the data signal C with the connection pin P ₂ .

By changing the settings of the mode register 15 as described above, data signals A, B and C
The correspondence relationship between and the connecting pins P ₁ , P ₂ and P ₃ can be easily changed.

〔Effect of the invention〕

As explained above in detail, according to the data transfer device of the present invention, the correspondence relationship between the data signal and the connection pin can be changed by changing the setting conditions of the control circuit. This has the effect of eliminating the need to create a new connection cable or change the configuration of a connection circuit when connecting logic devices that have different correspondences with connection pins. Therefore, design and manufacturing man-hours can be reduced, and parts management and maintenance management can be simplified.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram illustrating a data transfer apparatus according to the present invention, FIG. 2 is a block diagram illustrating an embodiment of the present invention, and FIG. 3 is an explanatory diagram illustrating the operation of the embodiment of FIG. 2. 1... Data transfer device, 2... Data selection circuit, 3... Direction switching circuit, 4... Control circuit.

Claims (1)

[Scope of Claims] 1. A data transfer device that connects and transfers data between a plurality of logical devices such as a main storage device, an arithmetic unit, an input/output device, etc., comprising: the logical device and the data transfer device; a control circuit that sends a control signal that sets the type of data corresponding to each of a plurality of pins of a connection cable connecting the connection cable; A data transfer device comprising: a data selection circuit for changing the data; and a direction switching circuit for switching the data transfer direction according to the control signal.