JPH08272706A - Peripheral equipment system - Google Patents

Abstract

PURPOSE: To prevent a normal peripheral equipment from becoming disable to be used if a fault disturbing an interface occurs in a data transmission line which is daisy-chain-connected in a peripheral equipment system wherein a peripheral controller and plural peripheral equipments are daisy-chain-connected. CONSTITUTION: The peripheral controller 101 is equipped internally with a peripheral equipment check indication part 103, and each peripheral equipment 104 is provided internally with a relay opening/closing part 107 which can make and break the daisy chain connections, a test data sending-out part 109 which sends out test data to a port part 105, and a data comparison part 108 which compares the test data with the output of the port part 109. Consequently, the peripheral equipment itself can judge a peripheral equipment where a fault occurs and disconnects it from the daisy chain connections to prevent other peripheral equipments from being disabled to be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peripheral device system, and more particularly to a peripheral device system in which a peripheral controller and a plurality of peripheral devices are connected in a daisy chain.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional peripheral device system includes a peripheral control device 201 and a peripheral control device 20.
1 and a plurality of peripheral devices 204 controlled by the data transmission line 1
A peripheral control device 201 is connected to the peripheral control device 201 by a so-called daisy chain connection. Further, the peripheral control device 201 includes the control device control unit 102, and the plurality of peripheral devices 204 are
Each is provided with a port unit 105 and a peripheral device control unit 106, and an external storage device such as a magnetic disk device (not shown) is connected to each peripheral device control unit 106.

Here, the peripheral control device 201 controls a plurality of peripheral devices 204 connected in a daisy chain by the data transmission path 111 under the control of a host device (not shown), and the ports of each peripheral device 204 are controlled. Data input / output processing is performed with the external storage device via the unit 105 and the peripheral device control unit 106.

[0004]

In this conventional peripheral device system, since the peripheral control device and a plurality of peripheral devices are connected in a daisy chain, for example, a failure occurs in one of the peripheral devices during system operation. However, if the high level output is still sent to the data transmission line and the interface is disturbed, all other peripheral devices become unusable, and the system reliability is significantly reduced. is there.

[0005]

A peripheral device system of the present invention comprises a peripheral control device and a plurality of peripheral devices controlled by the peripheral control device. The peripheral control device and the plurality of peripheral devices are provided with a data transmission path and an instruction. A peripheral device system connected in a daisy chain by a signal transmission line, wherein the peripheral control device exchanges data with a higher-level device and detects an abnormality in the peripheral device by detecting an abnormality on the data transmission line. A control device control unit that outputs a signal; and a peripheral device check instruction unit that receives the detection signal and sends a check instruction to the plurality of peripheral devices via the instruction signal transmission path, and A peripheral device controls a peripheral device control unit for controlling input / output of data to / from an external storage device, the control device control unit, and the peripheral device control unit, respectively. A port unit provided between the ports for controlling the input / output of data, and in response to the check instruction from the peripheral device check instruction unit, sends an instruction to disconnect the data transmission path to the relay opening / closing unit and operates to the port unit. A test data sending section for sending test data for testing, a relay opening / closing section for disconnecting the connection with the data transmission line by a disconnection instruction sent by the test data sending section, and a test result output from the port section. It is characterized by further comprising: a data comparison unit that compares the data with the test data sent by the test data sending unit and sends a reconnection instruction to the relay opening / closing unit when they match.

[0006]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. As shown in FIG. 1, the peripheral device system of the present invention includes a peripheral control device 101, a plurality of peripheral devices 104 controlled by the peripheral control device 101, an instruction signal transmission line 110 and a data transmission line for transmitting a check instruction. And 111.

The peripheral control device 101 transmits and receives data to and from a higher-level device, and detects a failure in the peripheral device by detecting an abnormality on the data transmission path 111, and a control device control unit 102 that outputs a detection signal. Peripheral device check instruction unit 1 that receives a detection signal and sends a check instruction to a plurality of peripheral devices via the instruction signal transmission path 110
03.

The plurality of peripheral devices 104 are provided between the peripheral device control unit 106 for controlling data input / output, and between the control device control unit 102 and the peripheral device control unit 106 for data input / output control. In response to the check instruction from the port unit 105 and the peripheral device check instruction unit 103, the relay opening / closing unit 107 issues an instruction to disconnect the data transmission path 111.
To the port unit 105 and a test data transmitting unit 109 for transmitting test data for an operation test to the port unit 105, and a relay opening / closing for disconnecting the connection with the data transmission line 111 by a disconnection instruction transmitted by the test data transmitting unit 109. Part 107,
The test result data output from the port unit 105 and the test data sent by the test data sending unit 109 are compared, and a data comparison unit 108 that sends a reconnection instruction to the relay opening / closing unit 107 when they match each other is further provided. An external storage device, for example, a magnetic disk device (not shown) is connected to each peripheral device control unit 106. And
The plurality of peripheral devices 104 are daisy-chained to the peripheral control device 101 by an instruction signal transmission line 110 and a data transmission line 111, respectively.

Next, the operation of the present embodiment configured as described above will be described.

As in the case of the conventional example, the peripheral control device 101 controls a plurality of peripheral devices 104 by the data transmission path 111 connected in a daisy chain under the control of a host device (not shown). Port section 1 of peripheral device 104
05 and the peripheral device control unit 106 to execute data input / output processing with the external storage device.

Here, the peripheral device 104 in operation of the system
If a failure occurs in any one of the peripheral devices 104, a high-level output remains being sent to the data transmission path 111, and a failure that disturbs the interface occurs, the control device control unit 102 causes the peripheral device 104 to operate. It is detected that a failure has occurred in the crab, and a detection signal to that effect is output to the peripheral device check instruction unit 103. Peripheral device check instruction unit 103
When receiving the detection signal from the control device control unit 102, the daisy-chain connected instruction signal transmission line 110
A check instruction is issued to the test data transmission unit 109 of each peripheral device 104 via.

Upon receiving the check instruction from the peripheral device check instruction unit 103, the test data transmission unit 109 issues a route disconnection instruction to the relay opening / closing unit 107, and the relay opening / closing unit 107 causes the data transmission line 111 and the port unit 105. Disconnect from. When the data transmission path 111 and the port section 105 are disconnected, the test data sending section 109 sends the test data to the port section 105 and the data comparing section 108. Then, the port unit 105 executes the test based on the sent test data, and outputs the result as test result data.

On the other hand, the data comparison unit 108 compares the data transmitted by the test data transmission unit 109 with the test result data output from the port unit 105, and determines whether or not they match.

Here, when the both data match, the data comparing section 108 outputs a reconnection signal to the relay opening / closing section 107. Then, when the relay opening / closing unit 107 receives this reconnection signal, the relay opening / closing unit 107 reconnects the data transmission path 111 and the port unit 105. As a result, all the normal peripheral devices 104 are connected to the peripheral control device 101 via the data transmission path 111, and only the failed peripheral device 104 is disconnected from the peripheral control device 101.

[0016]

As described above, according to the present invention, in a peripheral device in operation, when a failure such as a high level output always occurs on the data transmission line, all peripheral devices to which the peripheral control device is connected are connected. Since the device is instructed to test the port part and the peripheral device itself tests the port part, and the daisy chain connection of the peripheral device itself that detected the failure is disconnected, other normal peripheral devices can be used. Therefore, there is an effect that the reliability of the system is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a configuration of a conventional peripheral device system.

[Explanation of symbols]

 101, 201 Peripheral control device 102, 106 Control device control unit 103 Peripheral device check instruction unit 104, 204 Peripheral device 105 Port unit 106 Peripheral device control unit 107 Relay opening / closing unit 108 Data comparison unit 109 Test data transmission unit 110 Instruction signal transmission path 111 data transmission path

Claims (1)

[Claims] 1. A peripheral device system comprising a peripheral control device and a plurality of peripheral devices controlled by the peripheral control device, wherein the peripheral control device and the plurality of peripheral devices are connected in a daisy chain by a data transmission line and an instruction signal transmission line. The peripheral control device transmits and receives data to and from a host device and detects a fault in the peripheral device by detecting an abnormality on the data transmission path, and outputs a detection signal to the control device control unit, and the detection unit. A peripheral device check instruction unit that receives a signal and sends a check instruction to the plurality of peripheral devices via the instruction signal transmission path, and each of the plurality of peripheral devices inputs data to an external storage device. A peripheral device control unit that performs output control, and a port that is provided between the control device control unit and the peripheral device control unit and that controls input / output of data. Unit and the peripheral device check instruction unit, receiving the check instruction from the peripheral device check instruction unit, transmitting a disconnection instruction of the data transmission path to the relay opening / closing unit and transmitting test data for an operation test to the port unit. Section, a relay opening / closing section that disconnects the connection to the data transmission line by a disconnection instruction sent by the test data sending section, test result data output from the port section, and the test sent by the test data sending section. A peripheral device system, comprising: a data comparison unit that compares the data and sends a reconnection instruction to the relay opening / closing unit when they match.