JPH0535648A - Time division multiplex interruption informing system - Google Patents

Abstract

PURPOSE:To surely perform the interruption information between a central processing unit and plural input output devices. CONSTITUTION:A central processing unit 2 reads and performs an instruction from a main memory 1 to store a processing program. To the central processing unit 2, plural input output devices 3a-3d to operate by the control of the central processing unit 2 are connected. Between the central processing unit 2 and plural input output devices 3a-3d, one interruption informing signal line 5 is connected. The interruption information to occur due to the processing completion report factor or the trouble information factor of the input output devices 3a-3d is performed at the time assigned for respective input output devices 3a-3d and transferred to the interruption informing signal line 5. Thus, even when an input output device 3 is increased, the interruption information can be surely performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division multiple interrupt notifying system for notifying an interrupt from each input / output device to a central processing unit.

[0002]

2. Description of the Related Art A conventional interrupt notification system, as shown in FIG. 3, includes a main storage device 11 for storing a processing program,
Between the central processing unit 12 that reads and executes instructions from the main memory 11, a plurality of input / output devices 13a to 13d that operate under the control of the central processing unit 12, and between the central processing unit 12 and the plurality of input / output devices 13a to 13d. Common data bus 14 for transmitting and receiving data, and interrupt notification lines 15a to 15f from each of the input / output devices 13a to 13d to the central processing unit 12. The central processing unit 12 is provided with a terminal 16 and each of the input / output devices 13a to 13d is provided with a terminal 17a to 17d.

Next, the operation will be described.

In FIG. 4A, the address information 100 is shown in FIG.
Data information 200 is shown in each of (b). The address information 100 has a receiving device number 101 and a transmitting device number 102. The data information 200 is an IS number.

In the first input / output device 13a, the central processing unit 12 is operated via the interrupt signal line 15a when a processing end report factor occurs and via the interrupt signal line 15b when a fault notification factor occurs.
To the central processing unit 12, and the central processing unit 12 performs the interrupt processing.

Similarly, the second input / output device 13b is connected to the nth input / output device 1 through the interrupt signal lines 15c and 15d.
3c sends an interrupt notification to the central processing unit 12 via the interrupt signal lines 15e and 15f.

The mth input / output device 13d sends an interrupt notification to the central processing unit 12 via the common bus 14.
In this case, the address information 100 including the receiving device number 101 and the transmitting device number 102 is transmitted, and the data information 200 is transmitted.
As an interrupt number IS.

[0008]

In the conventional interrupt notification system, since a signal line is connected from each input / output device to the central processing unit to notify an interrupt, the number of input / output devices increases. In addition, there is a drawback that the signal line cannot be connected due to lack of terminals of the central processing unit.

Further, in the case of issuing an interrupt notification via the common bus, there is a problem that the interrupt notification is disabled when the common bus fails.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a time division multiplex interrupt notification system capable of reliably issuing an interrupt notification even if the number of input / output devices increases. .

[0011]

In order to achieve the above object, a time division multiple interrupt notification system of the present invention includes a main storage device for storing a processing program and a central processing unit for reading and executing an instruction from the main storage device. A processing unit, a plurality of input / output units that operate under the control of the central processing unit, and an interrupt notification signal line that connects the central processing unit and the plurality of input / output units; It is characterized in that an interrupt notification generated by a factor or a failure notification factor is given at a time assigned to each input / output device.

Here, the interrupt notification signal line is composed of one line.

In the present invention, since the interrupt notification is time-division multiplexed on one signal line and is sent out, the number of interrupt notification signal lines does not change even if the number of input / output devices increases, and the central processing unit. There is no limit on the number of I / O devices that can be connected due to lack of terminals. Further, in the present invention, since the common bus is used only for data transmission / reception and the interrupt notification line is separately provided, the interrupt notification is not disabled even if the common bus fails.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a time division multiplex interrupt notification system according to the present invention. In FIG. 1, the main storage device 1 stores a processing program. The main storage device 1 is connected to the central processing unit 2. The central processing unit 2 reads and interprets an instruction from the main memory 1 and executes it. To the central processing unit 2, a plurality of input / output devices 3a to 3d which operate under the control of the central processing unit 2 are connected via a common bus 4, and the central processing unit 2 and the plurality of input / output devices 3a to 3d are connected. Send and receive data between Also,
The plurality of input / output devices 3a to 3d are connected to the central processing unit 2 via the interrupt signal line 5, and each of the input / output devices 3a to 3d.
An interrupt notification is sent to the central processing unit 2 from 3d. In addition,
Reference numeral 6 is a terminal of the central processing unit 2, and reference numerals 7a to 7d are terminals of the input / output devices 3a to 3d.

The operation of the embodiment thus constructed will be described.

FIG. 2 is a format showing an interrupt multiple signal transmitted on the interrupt signal line.

When activating the first input / output device 3a, the central processing unit 2 sends an order to the input / output device 3a via the common bus 4. If output device 3a is processed by performing the processing indicated by the order is completed, and sends the interrupt signal line 5 an interrupt signal ISB ₁ at time t ₂ as the end report.

The end report interrupt of the second input / output device 3b sends an interrupt signal ISB ₂ at time t ₄ . Similarly, the completion report interrupt of the n-th I / O device 3d outputs the interrupt signal ISB _n at time t _m .

Here, the fault interrupt signal ISA ₁ when the first input / output device 3a has failed is sent to the interrupt signal line 5 at time t ₁ . An interrupt signal ISA ₂ when the second input / output device 3b has a failure is sent at time t ₃ .

Similarly, the interrupt signal ISA _n when the n-th input / output device 3d fails is sent at the time t _{m -1} .

The central processing unit 2 determines whether or not there is an interrupt transmitted on the interrupt signal line 5 at each time and performs an interrupt process.

As described above, in this embodiment, the interrupt notification is time-division multiplexed on one signal line 5 and is sent out. Therefore, even if the number of input / output devices 3 increases, the interrupt notification signal line The number 5 is invariant and the input / output device 3 due to lack of terminals of the central processing unit 2
There is no limit on the number of connections in. Further, in this embodiment, since the common bus is used only for data transmission / reception and the interrupt notification line is separately provided, the interrupt notification will not be disabled even if the common bus fails.

[0024]

As described above, according to the present invention,
Since the interrupt notification is time-division multiplexed using one signal line and sent out, the number of interrupt notification signal lines does not increase even if the number of input / output devices increases, and the interrupt notification to the central processing unit is reliable. There is an effect that can be.

Further, according to the present invention, since the interrupt notification line is separately provided, there is an effect that the common bus can be used only for data transmission / reception and the interrupt notification can be surely performed even if the common bus has a failure. is there.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a time division multiple interrupt notification system of the present invention.

FIG. 2 is a format showing an interrupt multiple signal for explaining the operation of the embodiment of the present invention.

FIG. 3 is a block diagram showing a conventional interrupt notification system.

FIG. 4 is a signal format used in a conventional interrupt notification system.

[Explanation of symbols]

1 main memory 2 Central processing unit 3 I / O device 4 common buses 5 interrupt signal line

Claims (2)

[Claims] 1. A main storage device for storing a processing program; a central processing unit for reading and executing instructions from the main storage device; a plurality of input / output devices operating under the control of the central processing unit; and the central processing unit. And an interrupt notification signal line connecting between a plurality of I / O devices, and performs an interrupt notification generated by a processing completion report factor or a failure notification factor of the I / O device at a time assigned to each I / O device. A time-division multiple interrupt notification system characterized in that 2. The time division multiplex interrupt notification system according to claim 1, wherein the number of the interrupt notification signal lines is one.