JPH036626A - Input/output controller - Google Patents

Abstract

PURPOSE:To attain an effective reinterruption processing in accordance with the state of a CPU by instructing a waiting time via the CPU when a reinterruption is carried out. CONSTITUTION:An interruption answer discriminating circuit 113 discriminates whether an interruption is accepted or not. If not, the circuit 113 discriminates whether a reinterruption is requested or not. If so, the circuit 113 starts a reinterruption processing to a control circuit 115. Thus the circuit 115 issues an instruction to an interruption control circuit 111 to start the transfer of the interruption after a time designated by a parameter and based on the contents of an answer parameter receiving circuit 114. Then the circuit 111 carries out an interruption to a CPU via a common bus control circuit 110. Thus it is possible to attain a highly efficient reinterruption process in accordance with the state of the CPU.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an input/output control device for a data processing device, and more particularly to interrupt control of the input/output control device.

2. Description of the Related Art Conventionally, this type of input/output control device performs the re-interruption after a preset certain period of time when re-interrupting when the central processing unit rejects the interrupt.

Problems to be Solved by the Invention In the conventional input/output control device described above, the re-interrupt wait time is fixed to a preset value, so the re-interrupt is executed regardless of the state of the central processing unit. , the interrupt efficiency was poor.

The present invention has been made in view of the above-mentioned conventional situation,
Therefore, an object of the present invention is to provide a novel input/output control device that solves the above-mentioned problems inherent in the conventional technology and makes it possible to realize highly efficient re-interrupt processing.

Means for Solving the Problems In order to achieve the above object, an input/output control device according to the present invention includes an interrupt control circuit that initiates an interrupt to a central processing unit, and an interrupt control circuit that initiates an interrupt to a central processing unit, and a central processing unit that initiates an interrupt via a common bus. A common bus control circuit that controls bus transfer for transmission to devices, an interrupt response determination circuit that determines whether the central processing unit has accepted or rejected an interrupt, and a response parameter receiver that receives re-interrupt parameters when an interrupt is rejected. and a re-interrupt control circuit for re-interrupting according to specified parameters.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an input/output control device according to the present invention.

Referring to FIG. 1, an input/output control device 10 according to the present invention
0 is connected to a central processing unit (not shown) via a common bus 101.

The main control circuit 112 is a central control circuit that controls each part of the input/output control device 100, and the operation of the input/output control device 100 is controlled by the main control circuit 112.

When the input/output control device 100 generates an interrupt to the central processing unit, the main control circuit 112 first instructs the interrupt control circuit 111 to start the interrupt. The interrupt control circuit 111 that received the instruction executes the common bus control circuit 110.
and executes an interrupt to the central processing unit via the common bus 101. When the interrupt is not accepted, the central processing unit notifies the input/output control device 100 of a response requesting a re-interrupt and a parameter instructing the wait time for the re-interrupt.

The input/output control device 100 transmits the response and parameters to the common bus control circuit 110 and transmits them to the interrupt response determination circuit 11.
3 and response parameter receiving circuit 114, the interrupt response determination circuit 1.13 determines whether the interrupt has been accepted or rejected, and if rejected, whether it is requesting another interrupt. determine whether

If the response is a request for a re-interrupt, the interrupt response determination circuit 113 instructs the re-interrupt control circuit 115 to start a re-interrupt process.

The re-interrupt control circuit 115 is the response parameter receiving circuit 1
14, the interrupt control circuit 111 instructs the interrupt control circuit 111 to start interrupt transfer after waiting the time specified by the parameter.0 The interrupt control circuit 111 sends an interrupt to the central processing unit via the common bus control circuit 110 Execute.

As described in detail, according to the present invention, the waiting time when the input/output control unit performs a re-interrupt is instructed by the central processing unit, so that the waiting time is adjusted according to the state of the central processing unit. Effective re-interrupt processing can be performed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an input/output control device according to the present invention. 100... Input/output control device, 101... Common bus,
110... Common bus control circuit, 111... Interrupt control circuit, 112... Main control circuit, 113... Interrupt response determination circuit, 114... Response parameter receiving circuit,
115... Re-interrupt control circuit

Claims (1)

[Claims] In an input/output control device that is connected to a central processing unit via a common input/output bus and starts processing operations by interrupting the central processing unit, the input/output control device includes an interrupt control circuit that starts an interrupt for the central processing unit, and a common bus. a common bus control circuit that controls bus transfer so as to transmit the interrupt to the central processing unit via the central processing unit; and an interrupt response determination circuit that determines whether the central processing unit has accepted or rejected the interrupt;
It has a response parameter receiving circuit that receives a re-interrupt parameter when an interrupt is rejected, and a re-interrupt control circuit that performs a re-interrupt according to the specified parameters, and the input/output control device executes the command for the central processing unit. 1. An input/output control device that generates a re-interruption in accordance with a re-interruption parameter notified from the central processing unit along with a rejection response when the interrupt is rejected.