JPS63128835A - Internal bus connection system - Google Patents

Abstract

PURPOSE:To maintain the signal transmission/reception among all equipments even if a defect takes place on the way of bus path by the connection using desired (N-1)-line of buses in the bus connection of ring form via N-set of buses in N-set of equipments. CONSTITUTION:If a defect takes place on the way of transmission path of a bus Ba, a master equipment 4 sends a signal to both buses Ba and Bc. The signal sent from the equipment 4 is sent consecutively by the bus Ba in an adaptor 5 before a faulty part, and a signal sent from the equipment 4 passes through a bus Bc and is sent consecutively through the bus Ba in an adaptor before the defective part and the transmission direction of each gate 6 is set so as to be sent consecutively to the bus Ba. In the setting when a defect takes place in both the transmission paths of the buses Ba and Bb, the bus Bc or Bd is used in place of the defective bus Ba and Bb. Thus, if a defect takes place, the signal transmission/reception among the entire equipments is maintained without awaiting the repair.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an internal bus connection system, particularly an internal bus connection system for exchanging digital signals between devices within a station, such as a digital communication system or a digital processing system. .

[Conventional technology]

Conventionally, this type of internal bus connection method has been used to connect one main device and each additional device to avoid concentrating the bus connections with the main device when adding additional devices to expand the functions of the main device. An internal bus connection method is used in which the two are connected in cascade via a bus.

FIG. 4 is a block diagram showing a conventional internal bus connection system. The main device 1 and the additional device 2 have buses Ba and Bb.
The main device IT is connected in cascade as one end.

A gate 3 for impedance matching is connected to each additional device 2 at each connection point with the buses Ba and Bb.

Each gate 3 performs signal transmission in only one direction, transmitting the transmission digital signal of the main device 1 to each additional device 2 via bus Ba, and transmitting the transmission digital signal of each additional device 2 to the main device via bus Bb-. 1 for cascade transmission.

[Problem that the invention seeks to solve]

In the conventional internal bus connection method described above, the main device I is disposed at one end and the additional devices 2 are connected in cascade.
When a problem such as a disconnection, a short circuit between lines, or a failure of the gate 3 occurs in the transmission path of Bb and Bb, the additional device 2 located ahead of the problem location will
This has the problem that it becomes impossible to exchange signals with the main device l.

SUMMARY OF THE INVENTION An object of the present invention is to provide an internal bus connection system that solves the above-mentioned problems and allows signal transmission and reception between all devices to be resumed without waiting for the repair of a problem in the bus transmission path.

[Means for solving problems]

The system of the present invention provides at least one set of bus connections connected in a ring shape through t-N buses of devices (N is a preset natural number), and each set of bus connections. The N devices are connected in cascade by selectively using desired (N-1) buses among them.

〔Example〕

Next, one embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The main device 4 and each additional device 5 are connected in cascade via buses Ba and Bb, and the main device 4 and each additional device 5 at both ends are further connected via buses Bc and Bd to form two sets of loops. The bus transmission route is configured. The main device 4 can select to send a signal to one or both of the buses Ba and Bc, and can also send a signal to one of the buses Bb and Bd or receive both signals. Tube selection available. The additional device 5 is connected to a gate 61 that can switch the transmission direction at each connection point with the buses Ba to Bd.

FIG. 2 is a block diagram showing an example of the configuration of the gate 6 in this embodiment. The gate 61 is a one-way transmission gate, such as a three-state gate array, whose signal transmission can be turned on and off by a control signal. Gate 6 has two gates 61
There is also a configuration r in which the buses are connected in parallel with each other in opposite directions, and connected in the middle of the bus.

FIGS. 3A to 3C are block diagrams showing examples of setting transmission paths in this embodiment. FIG. 5A shows an example of a setting in a normal state where there is no problem in the transmission paths of buses Ba and Bb. The main device 4 sends signals only to the bus Ba and receives signals only from the bus Bb. Each additional device 5
Then, the output signal of the main device 4 is transmitted in series on the bus Ba,
Furthermore, the transmission direction of each gate 6 is set so that the signals sent to the main device 4 are transmitted in series on the bus Bb. Same figure (b)
shows an example of settings when a problem occurs in the middle of the transmission path of bus Ba. The main device 4 has buses Ba and Bc.
sends a signal to both. In the additional device 5, which is located closer to the defective location, the output signal from the main device 4 is transmitted in cascade over the bus Ba, and in the additional device 5, which is further ahead than the defective location, the output signal from the main device 4 is transmitted via the bus Hc. The transmission direction of each gate 6 is set so that after passing through the bus Ba, the signals are transmitted in cascade on the bus Ba. FIG. 2C shows an example of settings when a problem occurs in the image transmission paths of buses Ba and Bb, respectively. In this case as well, by using the buses Bc and ad as substitutes for the buses Ba and Bb at the defective location, it is possible to maintain signal exchange between all the devices.

In this way, in this embodiment, when a problem occurs in the middle of the bus route, signal exchange between all devices can be resumed and maintained even after the problem is repaired. Although this embodiment shows the case where the transmission direction of each bus route is unidirectional, even in the case of a bus route for bidirectional transmission, the same effect as in this embodiment can be obtained by configuring a loop-shaped bus route. The result is clear.

〔Effect of the invention〕

As described above, the present invention has the effect of realizing an internal bus connection system that can restart signal exchange between all devices even if a problem occurs in the middle of the bus transmission path, waiting for the problem to be repaired.

[Brief explanation of the drawing]

MS1 to FIGS. 3(a) to 3(C) are block diagrams showing embodiments of the present invention, and FIG. 4 is a block diagram showing a conventional internal bus connection system. 1.4...Main device, 2,5...Additional device, 3゜6.61...Gate, Ba, Bb
, Bc, Bcl・”...Fig. 1 Fig. 2 (a) (b) Fig. 3

Claims (1)

[Claims] At least one set of bus connections is provided in which N devices (N is a preset natural number) are connected in a ring shape via N buses, and a desired (N-1 ) An internal bus connection method in which the N devices are connected in cascade by selectively using one of the buses.