JPH0693226B2 - Interrupt reporting device - Google Patents

Description

The present invention relates to an information processing device, and more particularly to an interrupt report side device.

[Prior Art] Conventionally, two systems are known as a system in which an interrupt report side device reports an interrupt to an interrupted report side device. One is a method in which the interrupt report side device sends a code indicating an interrupt factor to the interrupted report side device at the same time as the interrupt generation signal.
The other one is a method in which the interrupt report side device is difficult to read the interrupt factor after receiving the interrupt generation signal from the interrupt report side device.

The latter interrupt reporting method is effective when there are multiple interrupt factors and there is a possibility that interrupt factors may occur at the same time.The interrupt generation signal at this time is simply the logical sum of the interrupt factors. It was a conditional signal or a signal that was differentially associated with it.

[Problems to be solved by the invention]

However, when there are multiple interrupt factors, the above-described conventional interrupt generation signal remains active even if one of the interrupt factors is reset after the interrupt processing is completed. Interrupts are continuously reported regardless of the status of the device. Therefore, when the interrupt report side device is in a state of not accepting this interrupt, there is a drawback that the interrupt pending state must be created by firmware or hardware in the interrupt report side device.

[Means for solving problems]

In the interrupt report side device according to the present invention, two or more interrupt factors may occur at the same time, and in the interrupt report side device that reports an interrupt to the interrupt report side device, the interrupt report side device An interrupt generation means for transmitting an interrupt generation signal, an interrupt generation reset reception means for receiving an interrupt generation reset signal for resetting the interrupt generation signal from the interrupted report side device, and two or more. A plurality of interrupt factor flip-flops capable of holding the interrupt factor, and a plurality of interrupt factor flip-flops to the interrupted report side device in response to an interrupt factor read command from the interrupted report side device. Interrupt factor sending means for sending the interrupt factor held in each of the interrupt factor flip-flops, and an interrupt for receiving an interrupt factor reset signal for resetting the interrupt factor from the interrupt report side device With factor reset acceptance means The interrupt generation means includes one interrupt generation signal control flip-flop, and the interrupt generation signal is controlled by an output of the interrupt generation signal control flip-flop, and the interrupt generation signal control flip-flop is controlled. Is set to the first state by the interrupt generation reset signal, and the second state is set by the interrupt factor reset signal.
Is set to.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of an interface section between an interrupt report side device and an interrupt report side device according to the present invention. An interrupt report side device 1, an interrupt report side device 2, and an interrupt. Signal line 10 for transmitting a generated signal and signal line for transmitting an interrupt generation reset signal
11, a signal line 12 for transmitting an interrupt factor reset signal for resetting an interrupt factor, and a data bus line 23 between the interrupt report side device 1 and the interrupt report side device 2.

The interrupt reporting side device 1 includes a decoder 9 for decoding the value of the signal line 12 and signal lines 17, 1 for transmitting the output of the decoder 9.
8, 19 and 20 and interrupt factor flip-flops 3, 4, 5 which are independently reset by the signal lines 17, 18, 19 and 20
And 6, signal lines 13, 14, 15 and 16 for transmitting these output signals to the data bus line 23, an OR gate 7 having the signal lines 13, 14, 15 and 16 as input signal lines, and a signal line 17,18,19 and
An OR gate 41 having 20 as an input line, a signal line 25 transmitting an output signal of the OR gate 41, an output signal on the signal line 25, and a reset signal on the signal line 11 reset by the interrupt generation reset signal. Flip-flop 40, a signal line 21 for transmitting the output signal of the flip-flop 40, a signal line 22 for transmitting the output of the OR gate 7, a signal line 21 and a signal line 22.
AND gate 8 with signal line 10 as output line and signal line 10 as output line
And the opening / closing of the output is controlled by the signal on the signal line 24 from the decoder 9 and the signal lines 13, 14, 15 and
It consists of a driver 30 that conveys 16 contents.

The combination of the logical sum gate 7, the logical product gate 8, the signal line 10, the flip-flop 40, and the logical sum gate 41 is an interrupt generation means for transmitting an interrupt generation signal to the interrupt reporting device 2. Work as. Further, the signal line 11 functions as an interrupt generation reset reception means for receiving an interrupt generation reset signal for resetting the interrupt generation signal from the interrupt reporting device 2. Multiple interrupt factor flip-flops 3, 4,
5, 6 can hold two or more interrupt factors. The combination of the decoder 9, the signal line 24, the driver 30, and the data bus line 23 responds to an interrupt factor read command (described later) from the interrupt report side device 2 in response to the interrupt report side. Multiple interrupt factor flip-flops 3,
It functions as an interrupt factor sending means for sending the interrupt factors held in 4,5,6. Further, the combination of the signal line 12 and the decoder 9 acts as an interrupt factor reset accepting means for accepting an interrupt factor reset signal for resetting the interrupt factor from the interrupt report side device 2.

The interrupt generation signal is controlled by the output of the interrupt generation signal control flip-flop 40. The interrupt generation signal control flip-flop 40 is set to the first state by the interrupt generation reset signal and set to the second state by the interrupt factor reset signal.

Next, the operation of this embodiment will be described.

Now, consider the case where the interrupt factors are set in the flip-flops 3 and 5 at the same time (however, the interrupt report priority is 3>
5). At that time, the signal lines 13 and 15 become active, and the output of the OR gate 7 becomes a logic high level. Since the flip-flop 40 is set to the logical high level in the initial state, the signals on the signal lines 21 and 22 are both at the logical high level and the output of the AND gate 8 is at the logical high level. The output of the logical high level of the logical product gate 8 is used as an interrupt generation signal via the signal line 10 and the interrupted report side device 2
The occurrence of an interrupt is notified to.

When the interrupt occurrence report is received, the interrupted report side device 2 sends the signal line.
The flip-flop 40 is reset by setting 11 to active (logic high level), and the interrupt generation signal on the signal line 10 is set to logic low level.

At this time, the interrupt report side device 2 can perform another different process while recognizing the interrupt from the interrupt report side device 1.

After that, the interrupt reporting device 2 sends an interrupt factor read command to the signal line 2 to open the driver 30 via the decoder 9 and the signal line 24. as a result,
The values of the flip-flops 3, 4, 5 and 6 are sent out onto the data bus line 23, and the interrupt report side device 2 flips the flip-flop 3
Recognize that there are interrupt factors of 5 and 5. Since the interrupt factor of the flip-flop 3 has a higher priority than the interrupt factor of the flip-flop 5, the interrupt-reported device 2 performs the interrupt process of the interrupt factor of the flip-flop 3. At this time, the cause of interruption by the flip-flop 5 is in a state of being held in the interruption reporting side device 1. Therefore, the interrupt report-side device 2 can perform another process while the interrupt factor of the interrupt report-side device 1 remains.

If an attempt is made to excite an interrupt factor by the flip-flop 5, the decoder 9 and the signal line 20 are sent by sending a command for resetting the flip-flop 3 onto the signal line 12.
The flip-flop 3 is reset through the output of the OR gate 41, and at the same time, the output of the OR gate 41 becomes the logic high level. Therefore, the flip-flop 40 is set to the logic high level, and the signal line 21, the AND gate 8 and the signal line 10 are connected. An interrupt generation signal is sent from the interrupt report side device 1 via the.

Also, if there are multiple interrupt reporting devices, one of them
The two devices are designated as the interrupt report side device 1 ', and the interrupt report side device 1
If an interrupt from the interrupt report side device 1'having a higher priority than the interrupt factor of the flip-flop 5 occurs before the activation of the interrupt factor by the flip-flop 5, the interrupted report side device 2 It is also possible to process the interrupt of the interrupt report side device 1'during that the interrupt factor from the interrupt report side device 1 is not continuously processed.

〔The invention's effect〕

As described above, according to the present invention, one flip-flop that is reset (set) by the interrupt generation reset signal from the interrupt report side device and set (reset) by the interrupt factor reset signal is provided in the interrupt report side device. By having the above, it is possible not only to control the interrupt report of the interrupt report side device having multiple interrupt factors by the interrupted report side device and create an interrupt pending state for each interrupt report side device unit, This has the effect of simplifying the interrupt priority determination process between the interrupt report side devices of other systems in the interrupt report side device and contributing to a reduction in time loss during interrupt priority determination.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of an interface unit between an interrupt report side device and an interrupted report side device according to an embodiment of the present invention. 1 …… Interrupt report side device, 2 …… Interrupt report side device, 3,4,
5,6 …… Interrupt factor flip-flop, 7,41 …… OR gate, 8 …… AND gate, 9 …… Command decoder,
10 …… Interrupt occurrence signal line, 11 …… Interrupt occurrence reset signal line, 12 …… Interrupt factor reset signal line, 13,14,15,16,17,1
8,19,20,21,22,25 …… Signal line, 23 …… Data bus line, 24
...... Driver enable signal line, 30 …… Driver, 40…
... Flip-flop for controlling interrupt generation signal.

Claims (1)

[Claims] 1. An interrupt report side device (1) for reporting an interrupt to an interrupt report side device (2), wherein two or more interrupt factors can occur at the same time. An interrupt generation means (7,8,10,40,41) for transmitting an interrupt generation signal to, and an interrupt generation reset signal for resetting the interrupt generation signal from the interrupt reporting device Interrupt generation reset acceptance means (11), a plurality of interrupt factor flip-flops (3,4,5,6) capable of holding the two or more interrupt factors, and the interrupted report Interrupt factor sending means (9, 24) for sending the interrupt factor held in the plurality of interrupt factor flip-flops to the interrupt report side device in response to an interrupt factor read command from the side device. , 30,23) and an interrupt factor reset signal for resetting the interrupt factor from the device for reporting an interrupt. Interrupt factor reset accepting means (12, 9), the interrupt generating means includes one interrupt generation signal control flip-flop (40), and the interrupt generation signal is generated by the interrupt generation signal. Controlled by the output of the signal control flip-flop, the interrupt generation signal control flip-flop is set to the first state by the interrupt generation reset signal and set to the second state by the interrupt factor reset signal. An interrupt report side device characterized in that