JPS59223826A - Selector for extending device - Google Patents

Abstract

PURPOSE:To use the same transfer circuit for selection signal with a reduced increment of component parts for a system where plural extending devices are connected in series to a controller, by using only the selection signals of connection order to select the extending devices. CONSTITUTION:A controller 1 is connected in series to extending devices 12-14 via flat cables 5 and 6, i.e. interface lines of 1:1 correspondence. The connectors 71-77 use the same type for cables 5 and 6, and the selection signal pin of each extending device uses the No.1 type. Now the controller 1 selects the device 13 for example. In this case, the controller 1 delivers the selection signal from a pin of No.2, i.e. a selection signal output pin corresponding to the device 13 of the connector 71. This delivered signal is supplied to a pin No.2 of the connector 72 of the device 12. However the devic 12 is not selected and the selection signal is shifted. This selection signal is delivered from a pin No.1 of the connector 73 and supplied to a pin No.1 of the connector 74. Thus the device 13 is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a system in which one control device and a plurality of expansion devices are connected by the same selection signal through a one-to-one interface line such as a 7-rat cable. The present invention relates to an interface control device between a control device and an expansion device in an information processing device.

[Background of the invention]

Conventionally, in information processing equipment in which the interfaces of one control device and multiple expansion devices are connected by a 1-to-1 interface line such as a flat cable, selection of an expansion device is performed by sending a selection signal to the expansion device. This was done by providing a circuit. FIG. 1 is a selection signal discrimination circuit diagram of an expansion device. In the figure, a selection signal input sent from a control device l. A receiver circuit 2 for the expansion device to receive . The decoding circuit 4 is composed of a decoding circuit 4 that outputs 1.

With the expansion device discrimination circuit configured in this manner, the control device can correctly select the expansion device.

However, the selection signal discrimination circuit has the drawback that it requires a decoding circuit and the depth inch setting for each valley expansion device.

[Summary of the invention]

The main point of the present invention is an information processing device in which a plurality of expansion devices are connected in series to one control device using the same selection signal through an L-to-L interface cable such as a flat cable. Therefore, the selection signal receiving circuit of the expansion device is the same,
The circuit has a small increase in the number of parts, and selection of expansion devices is made possible by only a selection signal depending on the order in which they are connected.

[Embodiments of the invention]

FIG. 2 is a connection diagram between a control device and an expansion device according to an embodiment of the present invention, and FIG. 3 is a connection diagram using an expansion device selection signal discrimination circuit according to an embodiment of the invention.

In FIG. 2 and FIG. 3, 1 is a control device, 12 to 14
denotes an expansion device, 5 and 6 flat cables, and 71 to 77 connectors. The selection signal input pin of each expansion device is l-
Make 4 bottles.

In FIG. 2, when the control device 1 selects one of the expansion devices 12 to 14, it sends a selection signal corresponding to the selected expansion device to the flat cable 5.

This selection signal is simultaneously sent to the expansion devices 12-14. However, as shown in Figure M3, only pin 1 of the expansion device is the selection signal input pin, and the connection between the input pin and output pin of each expansion device is the input selection signal input pin.
Since the signal is shifted, only the expansion device that the control device l wants to select can receive the selection signal.

For example, when the control device l selects the expansion device 13, j
b() The control device l outputs a selection signal from pin 2, which is the selection signal output corresponding to the expansion device 13 of the connector 71.The output signal is sent to the connector of the expansion device 12 through the flat cable 5. The expansion device 1t12 is not selected, and the selection signal is shifted and output from the 1st pin of the connector 73.The output signal is sent to the expansion device t13 via the 7-rat cable 6. is input to pin 1, which is the selection signal input pin of the connector 74. Therefore, only the expansion device 13 can be correctly selected.

〔Effect of the invention〕

According to the present invention, in an information processing apparatus in which a plurality of expansion devices are connected in series to one control device using a 1:1 interface line such as a flat cable using the same selection signal, selection of expansion devices is possible. Depending on the order in which they are connected, they can be selected only by a selection signal.

[Brief explanation of the drawing]

FIG. 1 is a conventional expansion device selection signal discrimination circuit diagram, FIG. 2 is a connection diagram of the control # device and expansion device of the present invention, and FIG. 3 is an expansion device selection signal discrimination circuit diagram of an embodiment of the present invention. It is a connection diagram. 12-14... Expansion device, 71-77... Connector. Agent Patent Attorney Akio Takahashi 1st School

Claims (1)

[Claims] 1. In an information processing device in which a plurality of expansion devices are connected in series to one control device using the same selection signal through l-to-l interface lines, the selection signal reception of the expansion device is connected to a transfer circuit; An expansion device selection device characterized in that the expansion device selection device comprises a means that allows selection of the expansion devices only by a selection signal depending on the order in which the expansion devices are connected.