JPS63220344A - Data processor - Google Patents

Abstract

PURPOSE:To suppress the drop of the efficiency or performance of a CPU and I/O control devices by allowing a state monitoring device to monitor the I/O control devices through a signal line different from a common bus. CONSTITUTION:The state monitoring device 14 periodically monitors the state data for all the I/O control devices 121-123 connected to the common bus 10 through the signal line 14 and stores read state data in a storage circuit 132. In case of confirming a part or all of the I/O control devices 121-123 connected to the common bus 10, the device 13 is commanded by an I/O instruction to extract the state data stored in the storage device 132 by a bus response circuit 133 and sent to the CPU 11 through the common bus 10. Thereby, a part or all the states of the I/O control devices 121-123 connected to the common bus 10 can be confirmed only by sending an instruction only to the device 13.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a data processing device, and more particularly to an improvement in a state monitoring method for an input/output control device.

(Prior Art) Conventionally, in data processing devices, in order to monitor the status of an input/output control device, a central processing unit or a status monitoring device issues input/output commands via a common bus, and Checked the status of all input/output control devices.

(Problems to be Solved by the Invention) The conventional data processing device described above issues the same number of input/output commands as the number of input/output control devices connected to the common bus, which reduces the efficiency of the central processing unit. If an I/O command is issued to the I/O processor for status monitoring while the I/O controller is performing I/O processing, the I/O controller currently Since the input/output processing in progress must be temporarily interrupted or put on hold in order to respond to the input/output command, there is a drawback that the input/output processing capacity is reduced.

An object of the present invention is to eliminate the above drawbacks by monitoring the status of the input/output control device with a status monitoring device from a signal line separate from the common bus, and to prevent the input/output processing ability from decreasing. An object of the present invention is to provide a data processing device.

(Means for Solving the Problems) A data processing device according to the present invention includes a central processing unit, at least one input/output control device, and a status monitoring device for monitoring the status of the input/output control device. and are connected to each other by a common bus.

In the above, the input/output control device maintains its own status and can notify the status to the status monitoring device via a signal line separate from the common bus according to instructions from the status monitoring device. It is.

On the other hand, the status monitoring device reads the status of the input/output control device via the signal line, stores the read status data, and monitors some or all of the input/output control device according to instructions from the central processing unit. It is used to notify the central processing unit of status data.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a data processing apparatus according to the present invention. In FIG. 1, 10 is a common bus, 11 is a central processing unit, 13 is a status monitoring device, 121-
123 are input/output control devices, respectively.

The data processing device according to the present invention includes a central processing unit 11, a plurality of input/output control devices 121 to 123, and a status monitoring device 13 for monitoring the status of the plurality of input/output control devices 121 to 123. Processing device 11, multiple input/output control devices 121 to 123, and status monitoring device 13
They are connected by a common bus 10 forming a data transmission path. Meanwhile, multiple input/output control bags! 121-1
A signal line 14 is provided for transmitting the status of 23 to the condition monitoring device 13.

FIG. 2 is a block diagram showing an embodiment of the condition monitoring device 13 shown in FIG. In FIG. 2, 131 is a status receiving circuit, 132 is a storage circuit, and 133 is a bus response circuit.

The status monitoring device 13 is connected to a signal line 14 and includes a status receiving circuit 1 for receiving status data of the input/output control device 12.
31 and a storage circuit 132 for storing state data, which are connected to the common bus 10 and store the state data stored in the storage circuit 132 in accordance with instructions from the central processing unit 11. #11, and a bus response circuit 133 for notification.

The status monitoring device 13 connects to the common bus 10 via a signal line 14.
All input/output control devices 121 to 12 connected to
The state data of No. 3 is periodically monitored and the read state data is stored in the storage circuit 132. When checking the status of some or all of the input/output control devices 121 to 123 connected to the common bus 10 using the central processing unit 11,
The input/output command instructs the status monitoring device 13 to do the above, and the status data stored in the storage circuit 132 is taken out by the bus response circuit 133 and sent to the central processing unit 11 via the common bus 10.

Therefore, when the central processing unit 11 checks the status of the input/output control devices 121 to 123 connected to the common bus 10, it must issue an input/output command to each input/output control device 121 to 123. No condition monitoring device 13
The status of some or all of the input/output control devices 121 to 123 connected to the common bus 10 can be confirmed by simply sending an instruction to the common bus 10.

(Effects of the Invention) As explained above, the present invention improves the efficiency of the central processing unit and the input/output processing unit by monitoring the status of the input/output control unit with a status monitoring device from a signal line separate from the common bus. This has the effect of suppressing deterioration in performance.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a data processing apparatus according to the present invention. FIG. 2 is a block diagram showing an embodiment of the condition monitoring device shown in FIG. 1. 10... Common bus 11... Central processing units 121-123... Input/output control device 13... Status monitoring device 131... Status receiving circuit 132... Memory circuit 133... Bus response circuit 14...Signal line patent applicant: NEC Corporation representative, patent attorney Hisashi Inoro Figure 1 Figure 2

Claims (1)

[Claims] A data processing device configured by comprising a central processing unit, at least one input/output control device, and a status monitoring device for monitoring the status of the input/output control device, and interconnected by a common bus. The input/output control device maintains its own state and notifies the state monitoring device of the state via a signal line different from the common bus according to instructions from the state monitoring device. The state monitoring device reads the state of the input/output control device via the signal line and stores the read state data, and
A data processing device characterized in that the data processing device is for notifying the central processing unit of state data of part or all of the input/output control device in accordance with the instruction from the central processing unit.