JP3268347B2 - Bus connection control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus connection control system and, more particularly, to a bus connection control system for controlling a bus connection between these units in an information processing apparatus or the like composed of a plurality of units each having a common bus system. It is about.

[0002]

2. Description of the Related Art In a data processing apparatus, a configuration is adopted in which an input / output card having various functions is sequentially connected to a common bus for function expansion.

For example, as shown in FIG. 4, three common buses 1 to 3 are provided. In addition to the input / output cards 5 to 7, the common buses further include input / output cards 8 to 13. When a system is constructed by additionally connecting a plurality of cards, the input / output cards 8 to 13 to be added are connected to a common bus via the bus expansion modules 20, 21 and the like.

The card shown in FIG. 4 is a switch card (SW card), and has a function of switching and connecting three common buses 1 to 3 to an internal system bus (not shown).

[0005]

In such a conventional common bus system, when the number of cards using the same common bus increases and the number of cards is large, the bus capacity may be insufficient due to insufficient transmission capacity of the common bus. become.

FIG. 4 shows an extreme case in which all of the input / output cards 5 to 13 use only one common bus 3, and in such a case, the common bus 3 Is closed. That is, although the transmission capacity of the common bus in the entire system is present (common buses 1 and 2), if the transmission capacity of the common bus 3 is exceeded, the system cannot extend the common bus 3 anymore.

An example of such a prior art is disclosed in
See, for example, JP-A-2-137654.

Accordingly, the present invention has been made to solve such a problem of the prior art, and an object of the present invention is to provide a bus connection control system capable of efficiently using the transmission capacity of a common bus. To provide.

[0009]

According to the present invention, each of the first and second units includes a plurality of common buses, a plurality of common buses connected to the common buses, and a plurality of common buses connected to the common buses. A plurality of input / output cards, and a bus connection control system for controlling connection of each of the common buses of the second unit to each of the common buses of the first unit . Connect the unit 2 with a connection cable
The second unit is connected to the common bus of the own unit.
Forward each of the plurality of common buses of the first unit.
Each of the plurality of common buses of the first unit overlap each other.
Bus switching means that can be switched and connected without switching
Between the bus switching means and the connection cable
Demultiplexing means for performing bus demultiplexing control
The first unit has its own common bus and the pair wire cable.
Demultiplexing hands that are provided between the
A bus connection control system characterized by having stages
Can be

Further, according to the present invention, the first to n-th (n is 3)
Each of which has a plurality of common buses and a plurality of input / output cards connected to these common buses,
Connecting each of the n-th common buses to each of the common buses of the (n-1) th unit, and connecting each of the common buses of the (n-1) th unit to each of the common buses of the (n-2) th unit And a bus connection control system for sequentially controlling the connection of each of the common buses of the second unit to each of the common buses of the first unit by sequentially performing the connection. Each of the second to n-th units includes a bus switching means capable of switching and connecting each of the common buses of the own unit to each of the common buses of the first to (n-1) -th units without overlapping each other. A bus connection control system characterized by having a bus connection control system.

[0011]

A common bus is managed in each of the expansion units having an input / output card. A bus expansion module for switching and controlling the connection state of the common bus is provided in the expansion unit. In this case, the transfer data of each input / output card is efficiently switched and transferred.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system block diagram of an embodiment of the present invention. 1, the same parts as those in FIG. 4 are denoted by the same reference numerals. In this example, the first to third units a to a each having a plurality of input / output cards and three common buses
3c shows a system which is connected to each other to extend the function.

The first unit a includes common buses 1a, 2a,
A switch card (SW card) 4 connected to 3a;
It has input / output cards 5 and 6 connected to the common bus 3a, and a bus expansion module master card 14 having an interface function between the common buses 1a to 3a and the inter-unit connection cable 100.

The second unit b includes common buses 1b, 2b,
3b and input / output cards 8, 9 connected to the common bus 3b
And the common buses 1b to 3b and the unit connection cable 10
0, and a bus expansion module master card 16 having an interface function between the common buses 1b to 3b and the inter-unit connection cable 101.

The third unit is common 1c, 2c, 3c
And the input / output cards 11 to 13 connected to the common bus 3c
And common buses 1c to 3c and inter-unit connection cable 10
1 and a bus expansion module slave card 17 having an interface function with the bus extension module 1.

The bus expansion module master card 14,
Reference numeral 16 mainly has an output control to the common bus of the host unit and a main signal relay function. Also, the slave cards 15, 17
Has a function of controlling the output of the unit in which it is mounted to the common bus, a function of switching the common bus within the unit, and a function of relaying the main signal.

FIG. 2 is a block diagram showing a specific example of the master card and the slave card. In FIG. 2, a cable 100 connecting between the unit a (upper unit) and the unit b (lower unit) shown in FIG. An example of the master card 14 and the slave card 15 which constitute an interface with respect to the master card 16 and the slave card 17 is shown.
Needless to say, the same configuration is used.

Referring to FIG. 2, the bus expansion module master card 14 has a host unit a on which the bus expansion module master card 14 is mounted.
Data bus interface 141 for interfacing downlink data from the three common data buses 1a to 3a
And a data bus interface 142 for interfacing upstream data to the common data buses 1a to 3a.
A bus multiplexing / demultiplexing control unit 143 for multiplexing / demultiplexing each of the three data with respect to the data bus interfaces 141 and 142;
0, and controls the data bus interface 142 according to a control signal from the system so as to eliminate the overlap of the upstream data to the common buses 1a to 3a on the time slot. And a bus control unit 145.

The bus expansion module slave card 15 has a data bus interface 151 for interfacing downlink data to the three common data buses 1b to 3b of the unit b in which it is mounted, and a common bus 1b to 3b.
A data bus interface 152 for interfacing upstream data from 3b, a bus switching control unit 153 for switching and controlling which of the data buses 1b to 3b is to supply and connect three upstream data and three downstream data,
A bus multiplexing / demultiplexing unit 1 for multiplexing / demultiplexing each of the three data with respect to the data bus interfaces 151 and 152
And an interface 155 between packages (units) connected to the pair cable 100 for connection between units.
According to a control signal from the system,
A bus control unit 156 that controls the data bus interface 151 and controls switching of the bus switching control unit 153 so as to eliminate the overlap of the downlink data of 3c on the time slot.

FIG. 3 is an equivalent system connection diagram when the expansion units in the embodiment of the present invention shown in FIGS. 1 and 2 are connected by a bus expansion module master card and a slave card, respectively. As can be seen from comparison with the conventional example of FIG. 4, in the conventional example of FIG.
3, the common buses 1 to 3 are simply in an extended form, and the transmission capacity of each of the common buses 1 to 3 does not change at all, and the input / output card is connected beyond the transmission capacity of each common bus. I can't. However, as shown in FIG. 3, according to the present invention, when the bus 1a is frequently used, switching to the buses 2a and 3a is performed by performing bus switching of the bus switching control unit in the slave cards 15 and 17 of the bus expansion module. And input / output to / from the common bus in the basic unit (top-level unit) a
It can be other than a.

By doing so, the blockage of the common bus is eliminated up to the basic unit a, and the entire transmission capacity of the common bus of the system can be effectively used.

In the above embodiment, the extension units lower than the basic unit a are shown as two units b and c. However, it is apparent that the present invention can be generally applied to two or more units.

[0024]

As described above, according to the present invention, the bus switching function is provided in the bus expansion module in each unit, so that the bus blockage can be suppressed and the transmission capacity of the common bus of the entire system can be effectively utilized. This has the effect.

[Brief description of the drawings]

FIG. 1 is a system block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific example of a master card and a slave card of the bus extension module of FIG. 1;

FIG. 3 is an equivalent system connection diagram of the embodiment of the present invention.

FIG. 4 is an equivalent system connection diagram of a conventional example.

[Explanation of symbols]

a to c units 1 to 3 common bus 4 switching card 5 to 13 input / output card 14, 16 bus expansion module master card 15, 17 bus expansion module slave card 100, 101 pair cable 141, 142, 151, 152 for connection between units Data bus interface 143,154 Bus demultiplexer 144,155 Interface between packages 145,156 Bus controller 153 Bus switching controller

Claims (3)

(57) [Claims] 1. Each of the first and second units has a plurality of common buses and a plurality of input / output cards connected to the common buses, and each of the first and second units has a common bus of the second unit. A bus connection control system for controlling connection of each of the common buses of the first unit, wherein the first and second units are connected by a connection cable.
And the second unit connects each of the common buses of its own unit.
Each of the plurality of common buses of the first unit is connected to the first
Each unit's multiple common buses
Bus switching means that can be switched
Provided between the bus switching means and the connection cable.
Demultiplexing means for performing bus demultiplexing control, wherein the first unit has its own common bus and the paired cable.
Demultiplexing means for performing bus demultiplexing provided between
A bus connection control system, comprising: 2. The first to n-th (n is an integer of 3 or more) units.
Each of the ports is connected to a plurality of common buses and these common buses.
A plurality of input / output cards, and the n-th common bus
Are connected to each of the common buses of the n-1 units.
And each of the common buses of the (n-1) th unit is
connected to each of the common buses of the n-2 units.
Connection and finally the common bus of the second unit
Controlling connection to each of the common buses of the first unit
A bus connection control system, wherein each of the second to n-th units has a common unit.
Each of the second to n-th units is connected to its own
Each of the knitted common buses is connected to the first to (n-1) th units.
Each of the common buses of the first to (n-1) th units.
Switch to each of the common buses without overlapping each other
Characterized by having connectable bus switching means
Bus connection control system. 3. A connection cable between the first and second units.
Cables, and each of the units is connected to the connection cable.
Bus that provides an interface between the cable and the common bus
4. The method according to claim 3, further comprising demultiplexing means.
Bus connection control system.