JPS60181956A - Interface controlling system - Google Patents

Abstract

PURPOSE:To process preferentially an interruption from a lower rank device by reporting a busy status to a start signal sent from other high rank device until a response is received from a high rank device designated by the interruption concerned. CONSTITUTION:When interrupting information is outputted to a higher rank device 11 from a lower rank device 31, a reception obstructing state is formed against a start signal from other higher rank devices 12, 13 than the higher rank devices concerned. At the same time, an interrupting signal is outputted to the higher rank device 11 concerned for a prescribed time, and in case when a response signal is not received within the prescribed time concerned, said obstructing state is released. Thereafter, a busy status is reported to the optional higher rank device 12 or 13 which has outputted the start signal, and on the other hand, the interruption signal is outputted again for a prescribed time to the higher rank device concerned 11. Accordingly, the interruption from the lower rank device can be executed preferentially against the start from the higher rank device.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is provided between a plurality of higher-level devices and lower-level devices, and is capable of controlling activation from the higher-level device to the lower-level device and control of interrupts from the lower-level device to the higher-level device. This invention relates to an interface control method in a control device that performs.

[Technical Background] For example, as shown in FIG.
2.13, a higher-level group @31.32.33 that receives services from these higher-level devices, and a control unit 20 (control device) that provides an interface between these higher-level devices and lower-level devices. In a system where the upper group [, 11 (or 12.13)
(or 32.33) and lower-level device 31 (or 32.33) to -E device 11 (or 12.13)
Regarding the interface of the control unit 20 regarding interrupts, various requirements are made for each system.

"Prior Art and Problems" Conventionally, in this type of interface control system, for example, when the lower-level device 31 outputs interrupt information specifying the higher-level device 11, the control unit 20
outputs an interrupt signal to the host device 11 and receives a response from the host device 11. When there is a response from the higher-level device 11, the knee unit 2() maintains the connection state between the higher-level device 11 and the lower-level device 31, and connects the lower-level device 11 and the lower-level device 31.゛The job is executed.

Here, if there is no response from the lower device 11 and a start signal is output specifying the lower device 32 from another upper (r/shield), for example, the upper device 12, the control unit 20 will: After dropping the interrupt signal to the higher-level device 11 and instructing the lower-level device 31 to engrave and hold the interrupt information (interrupting the interrupt from the lower-level device 31), a start signal is output to the new lower-level device 32. , the connection state between the higher-level device 12 and the lower-level device 32 is maintained.

That is, the =1 control unit 20 performs an interface process 121t that gives priority to the above-mentioned activation regarding the activation from the higher-level device to the lower-level device and the interrupt from the lower-level device to the higher-level device.

By the way, when a first higher-level device controls a lower-level device, such as a magnetic disk device, there is a desire to continuously execute various processes such as read and write operations from startup of the magnetic disk device. However, when installing a magnetic disk, it takes time for the head to move to a specified position (seek operation), so generally a seek command is issued from the host device to the magnetic disk device, and after that, the host device and the magnetic disk device When the connection state between the magnetic disk drive and the host device is released and the seek operation is completed, the magnetic disk device issues an interrupt to the host device. As a result, if the conventional interface control method is applied to a system that includes such a magnetic disk device, it is possible for another higher-level device to start up a lower-level device while the magnetic disk device is outputting interrupt information. When you are
Priority was given to the processing for the start-up, and the above-mentioned expectations regarding the processing operation of the magnetic disk drive could not be satisfied.

[Objective of the Invention] The present invention has been made in view of the above, and is provided between a plurality of higher-level devices and lower-level devices, and is capable of starting up from a higher-level device to a lower-level device and from a higher-level device to a higher-level device. In a control unit that controls interrupts, provide an interface control method that prioritizes interrupt processing from lower-level devices to higher-level devices.
The purpose is to

Structure of the Invention] In order to achieve the above object, the present invention 1! An IJ is provided between a plurality of higher-level devices that output a startup signal to a lower-level device at an arbitrary timing, and controls the startup from the higher-level device and interrupts from the lower-level device to the higher-level device. This is an interface control method for a control device that performs (Any higher-level device that outputs an interrupt signal for a certain period of time, releases the above-mentioned blocking state if there is no response signal within the certain period of time, and then outputs a start signal. While reporting the busy status to the device, it also issues an interrupt signal for a fixed period of time to the host device.

[Embodiments of the invention] Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a block diagram of an example of a system to which the interface control method according to the present invention is applied. In the figure, 11.12.13 is a higher-level device, 31.32.33 is a lower-level device that receives services from each higher-level device 11.12.13, and 20 is a device connected between the higher-level device and the lower layer. , a roll unit (control device) that provides an interface between these higher-level devices and lower-level devices.

Here, control unit 1-2 (+ is microb L
It has a control unit 21 that performs 1-gram control, and this control unit 21 outputs interrupt information from lower-level devices 31, 32, and 33, and simultaneously outputs interrupt information from lower-level devices 31, 32, and 33 to upper-level bags [α When a block signal is output to the host device, an interrupt signal is also output to the designated host device. A block signal (2) is assigned to the host device 13, and a block (2) is assigned to the host device 13, respectively. And each block signal ■,■
, ■ (inverted signal) are Antogame-1-G4, respectively.
G5 and G6, and each host device 11.
The activation signal (selection signal) from 12.13 is further input to the control section 21 via the OR gate G7. In addition, the control unit 21 is configured to output a busy signal (Control LJnit Busy) if the activation signal is not input within a certain period of time after outputting the interrupt signal. It is designed to be input to each busy report circuit 22a, 22b, 22c in parallel via ANDG1 to G1 (32, G3) controlled by a start signal from the host device 11.12.13.Furthermore, Each busy report circuit 22
a 122b and 22c report the busy status to each host device 11, 12, 13 based on the busy signal from the control unit 21, and output a busy status report completion signal, and this report completion signal is sent to the OR gate. Since the signal is input to the control unit 21 via G8, the control unit 21 can recognize the completion of the busy status.

Next, the operation will be explained according to the 7-day test shown in FIG.

For example, when the lower-level device 31 specifies the higher-level device 11 and outputs interrupt information, the control section 21 outputs the block signals ``■'' and ``■'', and the anime games I-G5 and G6 become inhibited. That is, in this state, the activation signals from the host devices 12 and 13 are accepted (blocked). Then, the internal counter of the control unit 21 is reset to '0'' and the host device 11 An interrupt signal is output to the timer, and the timer sequentially increments from 1 while checking the activation signal (selection signal).

At this time, when the selection signal is input to the control unit 21, the AND GO 1-G5 and G6 are disabled by the block signals The L-level device 11 and the lower-level device 31 are connected, and the second-level device 11 performs interrupt processing.

On the other hand, when the timer exceeds the predetermined value 1, the control
1ill 21 resets the interrupt signal to the host device 11, and then outputs the block signals (1) and (2). At this time, if selection No. 11 is input to the control unit 21, the previous operation will be repeated, and if, for example, such an activation signal is issued to the lower device 12, this activation signal will be applied to the AND gate G5 and A game-[・Input to the control unit 21 via G7, and the control unit 21 recognizing this activation signal
A busy signal is output from Then, this busy signal is inputted to the C busy reporting circuit 22I) via the AND gate G2, which enters the allowable state in response to the above-mentioned fIJ signal, and the busy reporting circuit 22b issues a "C busy status report" to the host device 12. At the same time, a report completion signal of the busy status is output, and this report completion signal is input to the τ system 011 section 21 via the OR gate G8.

Further, the series of operations as described above continues until there is a response (output of a 3! selection signal) from the host device 11 designated as an interrupt.

As described above, according to this embodiment, when there is an interrupt from a lower-level device, the busy status is maintained in response to activation signals from other higher-level devices until a response is received from the device specified by the interrupt. Soothing as reported;
In this case, the interrupt will be processed with priority, and other higher-level devices will be able to recognize the busy status and efficiently execute other jobs.

[Effects of the Invention] As explained above, according to the present invention, when there is a source of interrupt information for a certain upper-level device t-7, the upper-level device other than the above-mentioned upper-level device In response to a start signal from a lower-level device, the receiver 1 () enters the blocking state and outputs an interrupt signal to the lower-level device for a certain period of time, and if there is no response signal within the specified period of time, the above Busy write is reported to any higher-level device that released the blocking state and then outputted the activation signal, and at the same time outputs the interrupt signal q for a certain period of time again to the higher-level device, so multiple Interrupts from lower-level devices can be prioritized between higher-level devices and lower-level devices that are serviced by these higher-level devices based on activation from the higher-level device.

[Brief explanation of the drawing]

Figure 1 shows the upper level device and the lower level! FIG. 2 is a block diagram showing an example of a system to which the interface control method according to the present invention is applied, and FIG. 11.12.13...Host device 20...' control unit]-21...Control unit 22a, 221 ), 22c...Hygie report circuit 31.32.33...Lower device patent applicant Fujitsu Limited

Claims (1)

[Claims] The device is installed between a plurality of higher-level devices and the lower-level device to output a startup signal to the lower-level device at an arbitrary timing, and is capable of receiving startup from the higher-level device and a higher-level S! from the lower-level device. This is an interface control method that is connected to a control device that controls interrupts for a certain device, and when a lower device outputs interrupt information to a higher device, an In response to the activation signal
state and outputs an interrupt signal to the host device for a certain period of time, and if there is no response signal within the certain period of time, cancels the blocking state and then outputs a start signal to the arbitrary host device. 1. An interface control method characterized in that, while reporting a busy status, an interrupt signal is outputted again for a certain period of time to the host device.