JPH0276052A - Bus extending device - Google Patents

Abstract

PURPOSE:To reduce the number of interruption request signal lines to connect a bus extending device and a processor main body by sending a time slot signal from an subsidiary control circuit, which is mounted to the processor main body, to the bus extending device and summurizing plural interruption requesting signals, which are generated in the internal part of this bus extending device, one signal synchronously with the time slot signal by a control circuit in the bus extending device side. CONSTITUTION:A bus extending device 21 is provided to extend the bus of the processor main body. Namely, when the interruption requesting signals being outputted from input and output controllers 2 and 3, which are mounted to a bus extending device 21, are received by a bus 4 of the bus extending device 21, a multiplexing control circuit 22 summurizes the signals to one interruption requesting signal synchronously with the time slot signal and an interruption requesting signal driver circuit 23 outputs the requesting signal to a signal cable 24 as the multiplexed interruption requesting signal. Thus, the number of the interruption requesting signal lines to connect the bus extending device 21 and a processor main body 8 can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a path extension device connected to a processing device main body such as a personal computer and a terminal device.

[Prior Art] FIG. 3 is a diagram showing the connection relationship between a conventional path extension device and a processing device main body. In the figure, l is the path extension device, and 2 is the human output control device (IOC-1) installed in the path extension device 1.
, 3 is the n-th human output control device (IOC-n) mounted on the path extension device 1, 4 is the path of the path extension device 1, 5 is the interrupt request signal driver circuit, and 6 is the path control other than the interrupt request signal. A signal generation circuit, 7 a signal cable, 8 a data processing device main body, 9 an interrupt request signal receiver circuit,
10 is a path control signal generation circuit other than interrupt request signals;
1 is the path of the processing device main body 8, ]2 is the interrupt control circuit (I
T), 13 is a central processing unit (C) that controls the entire system.
PU).

FIG. 4 is a diagram showing the timing of generation of an interrupt request signal according to a conventional example.

Next, the operation of the conventional path extension device and the main body of the processing device will be explained. The interrupt request signal output from the input/output control units 2 and 3 mounted in the path extension device 1 is sent to the path 42 interrupt request signal driver circuit 5 of the path extension device 1.
．． The interrupt request signal reaches the processing device main body 8 via the signal cable 7, is buffered by the interrupt request signal receiver circuit 9, and then is transmitted to the path 11 of the processing device main body 8. An interrupt control circuit 12 that receives an interrupt request signal is connected to the path 11 of the processing device main body 8.
It detects a level change from OW to High, bends the first to nth interrupt request signals of the human output control devices 2 and 3, and issues an interrupt request to the central processing unit 13.

In FIG. 4, an interrupt request signal generated from the human output control device (IOC-1) 2 and <0C-n) 3 is directly passed through the path 11 of the processing device main body 8 to the central processing unit (
The concept of the timing of reaching the CPU 13 is shown.

[Problems to be Solved by the Invention] Since the conventional path extension device described above is configured as described above, in order to accommodate a human output control device that uses a large number of interrupt request levels, a large number of extensions are required. It is necessary to have hardware that corresponds one-to-one to the interrupt request levels that have been received, and it is necessary to limit the number of interrupt request levels used by the path expansion device, and it is also necessary to make it possible to use a large number of interrupt request levels. However, there were problems such as an increase in the manufacturing cost of the device.

This invention was made to solve the above-mentioned problems, and it provides a path expansion device that can reduce the number of signal lines without reducing the number of interrupt request levels that can be used in the main body of the processing device. The purpose is to obtain.

[Means for Solving the Problems] A path extension device according to the present invention sends a time slot signal to the path extension device from an auxiliary control circuit mounted on a processing device main body, and transmits a time slot signal to the path extension device by transmitting a time slot signal to the path extension device. The interrupt request signal is synchronized with the time slot signal by the control circuit on the path extension device side and aggregated into a single signal, thereby reducing the number of interrupt request signal lines connecting the path extension device and the processing device main body. It is something that

[Function] In the path extension device of the present invention, an interrupt request signal generated inside the path extension device is transmitted through a signal cable by an attached control circuit mounted on the processing device main body side and a control circuit mounted on the path extension device side. The signal is then converted into a time-division signal and propagated between the path extension device and the processing device main body.

[Embodiment] FIG. 1 is a diagram showing the connection relationship between a path extension device and a processing device main body according to an embodiment of the present invention, and the same reference numerals as in FIG. 3 indicate the same or corresponding parts. In the figure, 21 is a path extension device equipped with a function according to the present invention, 22 is a multiplexing control circuit that aggregates a plurality of interrupt request signals generated inside the path extension device 21 into one signal line, and 23 is an interrupt request signal line. Signal driver circuit, 24 indicates processing device main body 8 and path expansion device 2
1, 25 is an interrupt request receiving circuit consisting of a receiver circuit that receives multiplexed interrupt request signals and a time slot signal generation circuit, and 26 is a signal cable that connects multiplexed interrupt request signals to the original interrupt request signal. This is a restoration circuit that restores

FIG. 2 is a diagram showing the timing of generation of an interrupt request signal according to an embodiment of the present invention.

Next, the operation of the path extension device and the processing device main body according to the embodiment of the present invention will be explained. Path extension device 21
When the path 4 of the path extension device 21 receives the interrupt request signals output from the human output control devices 2 and 3 mounted in The interrupt request signal driver circuit 23 outputs the signal to the signal cable 24 as a multiplexed interrupt request signal.

The multiplexed interrupt request signal is received by the interrupt request receiving circuit 25, and the restoring circuit 26 converts the interrupt request signal generated inside the path extension device 21 by the time slot signal to the inside of the processing device main body 8. It is transmitted to the interrupt control circuit 12 as if it were a generated interrupt request signal, and the interrupt control circuit 12 outputs the IR as shown in FIG.
It is recognized as an interrupt request signal from QI to IRQn, and as a result, the interrupt request is transmitted to the central processing unit 13.

Figure 2 shows the human output control device (IOC-1) 2 and (IOC-1)
This shows a state in which the interrupt request signal generated from OC-n) 3 is multiplexed on the signal cable 24 in synchronization with the time slot signal.

If we consider an example in which 16 types of interrupt request signals are combined into one multiplexed interrupt request signal, four control signals will be added as time slot signals, but the 16 interrupt request signal lines will simply be Can be consolidated into one book.

Incidentally, in the above embodiment, an example was explained in which the interrupt request signal is multiplexed, but DMA (d i rect
A request signal (memory access (direct memory access)) or other status signal may be used, and the same effect as in the above embodiment can be achieved.

[Effects of the Invention] As described above, according to the path extension device of the present invention, a time slot signal is sent to the path extension device from the attached control circuit mounted on the processing device main body, and time slot signals generated inside the path extension device are transmitted to the path extension device. A control circuit on the path extension device side synchronizes multiple interrupt request signals with the above time slot signal and aggregates them into a single signal, thereby reducing the number of interrupt request signal lines connecting the path extension device and the processing device main body. Since the configuration has been designed to reduce the number of
This has excellent effects in that the device can be constructed at low cost and a path extension device with high expandability can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the connection relationship between a path extension device and a processing device main body according to an embodiment of the present invention, FIG. 2 is a diagram showing the generation timing of an interrupt request signal according to an embodiment of the present invention, and FIG. 3 is a diagram showing a conventional FIG. 4 is a diagram showing the connection relationship between the path extension device and the processing device main body, and is a diagram showing the timing of generation of an interrupt request signal according to a conventional example. In the figure, 1, 21... path extension device, 2, 3...
・Human output control device (IOC-1), (IO(,-n
), 4... Path of path extension device 1, 5... Interrupt request signal driver circuit, 6... Path control signal generation circuit,
7゜24...Signal cable, 8...Processing device main body,
9... Interrupt request signal receiver circuit, 10... Path control signal generation circuit, 11... Path of processing device main body 8,
12... Interrupt control circuit (IT), 13... Central processing unit (CPU), 22... Multiplexing control circuit, 23.
. . . interrupt request signal driver circuit, 25 . . . interrupt request receiving circuit, 26 . . . restoring circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] a path extension device for extending a path of a processing device main body; a control circuit for combining a plurality of interrupt request signals generated by a control device mounted inside the path extension device into one signal;
A path expansion device comprising: an auxiliary control circuit mounted on the processing device main body for restoring a plurality of interrupt request signals from transmitted signals.