JPH1069439A - Interface signal operating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interface signal operating device which can test a function that detects a failure asynchronous with the transfer of data performed via an interface. SOLUTION: When a switch 4-1 is set at a position (1), the power definition signal 7 sent from a data transmission part 1 of a channel device is separated and the potential of the signal 7 received at a data reception part 3 is set at a high level. When the switch 4-1 is set at a position (2), the signal 7 is transmitted between both parts 1 and 3. When the switch 4-1 is set at a position (3), the signal 7 sent from the part 1 is separated and the potential of the signal 7 received at the part 3 is set at a low level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an interface signal operating device, and more particularly to an interface signal operating device of a data communication device.

[0002]

2. Description of the Related Art Under control of software, a channel device of a general-purpose computer mainly includes an operation procedure according to an input / output device to be processed, a transfer data amount, an address of a data area of a main storage device, and the like. Data transfer is performed between the input / output device and the main storage device according to the description of the channel program stored in the storage device.

Conventionally, as shown in FIG. 2, a data transmission unit 1 of a channel device and a data reception unit 3 of the channel device are connected by a data transfer cable 2.

[0004] Next, according to a test program, the data transmission unit 1 of the channel device to the data reception unit 3 of the channel device.
Then, a data loop-back transfer is started, and various data transfer is performed between the channel devices, thereby performing a function test of the channel device.

Conventionally, a data transfer test of a channel device is performed by
A data transmission side and a reception side of the channel device are connected by a loopback data transfer cable, and various tests such as a data transfer test and a false failure test of the channel device are performed by a test program.

[0006]

A failure that occurs in synchronization with data transfer such as a parity error has a built-in mechanism for intentionally embedding invalid data and creating a parity error state. A program can evaluate such a failure detection function.

However, as in the case of a power supply determination signal (a signal output during a period from when power is supplied to a channel device to when an unstable state of a logic circuit or the like in the channel device is eliminated), a signal of a partner device is output. In order to test a signal that is not synchronized with data transfer whose signal state does not change unless the state of the power supply changes, it is necessary to provide hardware for changing the state of the signal on the signal path.

For this reason, there is no method for evaluating a function of detecting a failure that is not directly caused by an action incorporated in the channel device and that is not synchronized with data transfer on the interface.

An object of the present invention is to provide an interface signal operation device capable of testing a function of detecting a failure not synchronized with data transfer on an interface.

[0010]

According to the present invention, there is provided an interface signal operating device inserted into a signal line connecting a data transmitting unit and a data receiving unit, wherein the signal line from the data transmitting unit is disconnected. The present invention provides an interface signal operating device including a potential applying unit for forcibly applying a predetermined level of potential to the data receiving unit.

The potential applying means has a switch element which can be switched from a state in which a signal line from the data receiving section is connected to the data transmitting section to a state in which the signal line is connected to the predetermined level of potential. I do.

Further, the signal line is a power supply determination signal line indicating that the power supply state of the data transmission section has been determined, and the potential of the predetermined level is a potential indicating the indefiniteness of the power supply state. I do.

The operation of the present invention is as follows. The state of the control signal is intentionally changed to logic “1” or logic “0” in the path of the loopback data transfer cable used conventionally.
In this state, an interface signal operation device that can be operated is provided so that the logic state of the control signal in the loopback data transfer cable can be arbitrarily operated, thereby enabling asynchronous operation (data transfer) during data transfer of the channel device. Pseudo-failure that does not synchronize with an event) An event is intentionally generated and an asynchronous event test is performed.

[0014]

Embodiments of 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 an interface signal operating device according to the present invention, and the same parts as those in FIG. 2 are denoted by the same reference numerals. In addition, overlapping description is omitted.

In FIG. 1, a data transmission unit 1 of the channel device and a data reception unit 3 of the channel device are composed of a data transfer cable 2-1, a connector 5, an interface signal operation device 4, a connector 6, and a data transfer cable 2-2. Connected through.

In the interface signal operation device 4,
Of the signal lines of the data transfer cables 2-1 and 2-2, only the power supply determination signal 7 is connected via the switch 4-1.

When the switch 4-1 is set to the position, the power supply determination signal 7 from the data transmission unit 1 of the channel device is cut off, and the potential of the power supply determination signal 7 received by the data reception unit 3 is adjusted by the pull-up resistor R1. high level)
Becomes

When the switch 4-1 is set to the position, the power supply determination signal 7 is transmitted to the data transmitting section 1 and the data receiving section 3.
Connected between When the switch 4-1 is set to the position, the power determination signal 7 from the data transmission unit 1 of the channel device is disconnected, and the potential of the power determination signal 7 received by the data reception unit 3 is low (level) by the pull-down resistor R2. Becomes

If the signal 7 is valid (power-confirmed state) when the power-confirmation signal 7 becomes high level, the switch 4-1 in the interface signal operating device 4 is set to a predetermined position and the switch is turned on (connected). State). next,
According to the test program, the data transmission unit 1 of the channel device,
A data loopback test between the data receiving units 3 is started. During the data transfer, the switch 4-1 in the interface signal operation device 4 is moved to the position of, and the power determination signal 7 is changed from the valid (high) state to invalid (high). (Low: power supply indeterminate state).

As a result, the data receiving unit 3 of the channel device detects a change in the state of the power determination signal 7 and notifies the firmware of the change. The firmware reports the change to the OS, the OS performs a fault process, and performs an asynchronous event test. finish.

If the signal 7 is valid when the power supply determination signal 7 becomes low level, the switch 4-1 in the interface signal operation device 4 is set to a predetermined position and is in a conductive state (connected state). Next, a data return test between the data transmission unit 1 and the data reception unit 3 of the channel device is started by the test program, and the switch 4-1 in the interface signal operation device 4 is moved to the position during data transfer. The power determination signal 7 is shifted from a valid (low) state to an invalid (high: power non-determination state) state.

As a result, the data receiving unit 3 of the channel device detects a change in the state of the power supply determination signal 7, notifies the firmware, reports the firmware to the OS, the OS performs a fault process, and performs an asynchronous event test. finish.

[0024]

As described above, according to the present invention, an asynchronous event test can be performed by inserting a switch into a connection (data transfer cable) system between a data transmission unit and a data reception unit of a channel device. There is.

[Brief description of the drawings]

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

FIG. 2 is a connection block diagram of a conventional channel device.

[Explanation of symbols]

 Reference Signs List 1 Data transmission unit of channel device 2-1 Cable for data transfer 3 Data reception unit of channel device 4 Interface signal operation device 4-1 Switch 5, 6 Connector 7 Power supply determination signal R1 Pull-up resistor R2 Pull-down resistor

Claims (3)

[Claims] 1. An interface signal operation device inserted into a signal line connecting a data transmission unit and a data reception unit of a channel device, wherein the signal line from the data transmission unit is disconnected and a predetermined signal is transmitted to the data reception unit. An interface signal operating device comprising a potential applying means for forcibly applying a level potential. 2. The device according to claim 1, wherein said potential applying means has a switch element which can be switched from a state in which a signal line from said data receiving section is connected to said data transmitting section to a state in which said signal line is connected to said predetermined level of potential. The interface signal operating device according to claim 1, wherein 3. The power supply determining signal line indicating that the power supply state of the data transmission unit has been determined, and the predetermined-level potential is a potential indicating that the power supply state is not determined. The interface signal operation device according to claim 1, wherein