JPH0359750A - Bus multiplexing circuit - Google Patents

Abstract

PURPOSE:To prevent the generation of bad influence to be exerted upon the other package at the time of connecting/disconnecting one package switching buses without generating instantaneous disconnection after connecting/ disconnecting the package to/from an unused bus. CONSTITUTION:A signal bus is provided with the 1st and 2nd buses 101, 102 which are independent of each other. Each of the packages 4, 5 is provided with two interface means 1, 2 passing a signal transmitted/received to/from the signal bus through a plug-in mounting means and a power supply switch 3 for selecting either one of the power supply terminals of the two interface means 1, 2 and connecting the selected terminal to a power supply bus 103 through the plug-in mounting means. A common bus selecting circuit 6 for connecting either one of the 1st and 2nd signal buses 101, 102 to the power supply bus 103 without generating instantaneous disconnection is also prepared. The selection system of the switch 3 is set up in a system different from a common bus selection circuit selecting system to connect/disconnect the package. Consequently, the supply of an error wave to an unrelational circuit is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] Used in a device configured with a package that can be mounted in plug-in mode. In particular, it relates to bus multiplexing circuits.

[ヰAlready required]

The present invention provides a bus multiplexing circuit having a package that can be inserted or removed by plug-in means, by performing insertion/removal without interruption after insertion/removal of an unused bus. This makes it possible to prevent adverse effects on other packages at the same time.

[Conventional technology]

FIG. 2 shows a configuration in which a device is constructed from packages that can be mounted in plug-in mode, and multiplexing is performed using a common bus between the ink faces of the signal lines between the packages.

[Problem that the invention seeks to solve]

In such a conventional example, there is only one common bus, and when one package is inserted or removed, the common bus is transiently disturbed, so there are drawbacks such as errors occurring in packages that are not related to the insertion or removal. be.

The present invention aims to eliminate such drawbacks and provides a bus multiplexing circuit having means capable of preventing adverse effects caused by transient disturbances during insertion/removal.

[Means for solving problems]

The present invention provides a bus multiplex system comprising a plurality of packages having plug-in attachment means, a signal bus through which signals exchanged with the packages pass, and a power supply bus connected to a power source that supplies power to the packages. In the circuit, the signal bus includes a first signal bus and a second signal bus that are independent of each other, and each of the packages has two interfaces through which signals exchanged with the signal bus pass through the plug-in mounting means. means and a power supply switch for selecting one of the power supply terminals of the two interface means and connecting it to the power supply bus via the plug-in attachment means, the first signal bus or the second signal bus; The present invention is characterized by comprising common bus selection means for connecting one of the two to the signal bus without momentary interruption.

[Effect]

When inserting a package, insert an unused interface buffer IC into an unused bus, supply switching power to this interface buffer IC, and then instantaneously transfer power from the bus in use to the unused bus. Switch all at once.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
The figure shows the block constituent countries showing the configuration of this embodiment.

This embodiment includes a #l package 4 and a #n package 5, each of which has an O-system interface buffer ICI connected to an O-thread signal bus 101 and a 1-system interface buffer ICI connected to a 1-system signal bus 102. Hua IC2
and a power supply selection switch 3 that selects whether to supply power to the 0-system interface buffer ICI or the 1-system interface buffer IC2. Signals are sent onto the common bus via the Nofa IC, and the signals are multiplexed by the common bus selected by the common bus selection circuit 6. That is, this embodiment includes a package 4.5 having a plug-in mounting means, a signal node through which signals exchanged with the package 4.5 are connected, and a power supply that supplies power to the package 4.5. Furthermore, as a feature and means of the present invention, the signal node includes a first signal bus 101 and a second signal node 102 that are independent of each other, and the package 4. 5 each include two interface means 1.2 through which signals exchanged with the signal bus pass through the plug-in mounting means.
and a power supply switch 3 for selecting one of the power supply terminals of the two interface means 1.2 and connecting it to the power supply bus 103 via the plug-in mounting means, and for connecting the first signal bus 101 or the second signal bus 102 to the signal bus without momentary interruption.

Next, the operation of this embodiment will be explained.

When the packages are mounted and in operation, each package's power supply selection switch 3 and common bus selection circuit 6
The same system is selected. When inserting or removing a package, the selection system of the power supply selection switch 3 of the package is set to a system other than the selection system of the common bus selection circuit, and the insertion/removal is performed to prevent malfunctions during insertion/removal.

〔Effect of the invention〕

As described above, the present invention has the effect of preventing errors from spreading to lines unrelated to the package when a package is inserted or removed.

4,

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a block configuration diagram showing the configuration of a conventional example. ■...0 series interface buffer IC, 2...1
System interface buffer ICl3...power supply selection switch, 4...#l package, 5...#n package, 6...common bus selection circuit, 7...interface buffer IC, 101...・0 series signal bus, 10
2...1 system signal bus, 103...Power supply bus, 104
...Signal bus.

Claims (1)

[Claims] 1. A device comprising a plurality of packages each having a plug-in mounting means, a signal bus through which signals exchanged with the packages pass, and a power supply bus connected to a power source that supplies power to the packages. In the bus multiplexing circuit, the signal bus includes a first signal bus and a second signal bus that are independent of each other, and each of the packages receives and transmits signals to and from the signal bus via the plug-in mounting means. and a power supply switch for selecting one of the power supply terminals of the two interface means and connecting it to the power supply bus via the plug-in attachment means, the first signal bus or the second A bus multiplexing circuit comprising common bus selection means for connecting one of the signal buses to the signal bus without momentary interruption.