JPH02219160A - Bus controller - Google Patents

Abstract

PURPOSE:To contrive the improvement of generality of an extended bus by executing an input and an output of information by an interface on the extended bus conforming to an interface of a signal terminal of an extended board mounted to an extended slot. CONSTITUTION:An interface detecting device 12 sends an interface detecting signal to an extended bus 8, detects a kind of a board mounted to an extended slot 9 by receiving and interpreting an interface signal returned from an extended board 10 and determines an interface on the extended bus 8 so as to coincide with an interface of a signal terminal of the board. Bus transfer devices 11A, 11B execute an input and an output of the information between a system bus 7 and the extended bus 8 in accordance with the determined interface. In such a way, the improvement of generality of the extended bus is contrived.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a bus control device that transfers information between a system bus and an expansion bus, and in particular, a bus control device that transfers information between a system bus and an expansion bus, and in particular, a bus control device that transfers information between a system bus and an expansion bus, and in particular, a bus control device that transfers information between a system bus and an expansion bus. The present invention relates to a bus control device that changes the speed of the bus.

[Conventional technology]

A conventional bus control device controls the bus according to a predetermined signal processing procedure between an expansion bus and a system bus that have predetermined interface signals.

(Problem to be Solved by the Invention) In the conventional bus control device described above, since the interface on the expansion bus is fixed, an expansion board having signal terminals of another interface cannot be mounted in the expansion slot. First, it has the disadvantage of reducing the versatility of the expansion bus.

[Means to solve the problem]

The bus control device of the present invention includes a system bus connected to a microprocessor, an expansion bus connected to an expansion slot in which an expansion board is mounted, and a bus for transferring information between the system bus and the expansion bus. In a system that has a transfer device, it sends an interface detection signal to the expansion bus, receives and interprets the interface signal returned from the expansion board, detects the type of board installed in the expansion slot, and detects the interface of the signal terminal of the board. The present invention is characterized by comprising an interface detection device that determines an interface on the expansion bus to match the interface, and a bus transfer device that inputs and outputs information between the system bus and the expansion bus in accordance with the determined interface.

〔Example〕

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

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

The bus control device 1 has an interface detection device 12.

It consists of bus transfer devices 11A and IIB that generate two different interface signals. An interface detection signal is sent from the interface detection device@12 to the expansion board 10 through the interface detection bus 2. When the expansion board 10 receives an interface detection signal from the interface detection device 12, it outputs an interface notification signal to one predetermined signal line of the signal line group of the expansion bus 8. Interface detection device 1
2, if the interface notification signal has a logical value of 0, it is interpreted that the interface of the expansion bus 8 and the interface of the bus transfer circuit of the bus transfer device 11A match, and conversely, if the interface detection signal has a logical value of 1, bus transfer is performed. It is interpreted that the interface of the bus transfer circuit of the device 11B matches the interface of the expansion bus 8.

When the interface detection device 12 completes the interpretation of the interface notification signal, it notifies the microprocessor 6 by means of the bus transfer authorization signal 3 that information can be transferred onto the system bus 7. Using control signals 4 and 5, one of the bus transfer devices 11A and IIB that has a bus transfer circuit that matches the interface on the expansion bus 8 is exclusively selected, and an operation command is output to that bus transfer device 11A or IIB. .

The selected bus transfer device [11A or 11B continues to operate until a new command is received from the interface detection device 12, and inputs information between the system bus 7 and the expansion bus 8 according to a fixed interface. Perform output.

〔Effect of the invention〕

As explained above, the present invention has the effect of increasing the versatility of the expansion bus by inputting and outputting information through the interface on the expansion bus in accordance with the interface of the signal terminal of the expansion board mounted in the expansion slot. play.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Bus control device, 2... Interface detection bus, 3... Bus transfer authorization signal, 4... Control signal, 5
...Control signal, 6...Microprocessor, 7...
- System bus, 8... Expansion bus, 9... Expansion slot, 10... Expansion board, IIA, IIB... Bus transfer device, 12... Interface detection device.

Claims (1)

[Claims] In a system that has a system bus connected to a microprocessor, an expansion bus connected to an expansion slot in which an expansion board is installed, and a bus transfer device for transferring information between the system bus and the expansion bus, It sends an interface detection signal to the bus, receives and interprets the interface signal returned from the expansion board, detects the type of board installed in the expansion slot, and detects the type of board installed on the expansion bus to match the interface of the signal terminal of the board. A bus control device comprising: an interface detection device that determines an interface; and a bus transfer device that inputs and outputs information between a system bus and an expansion bus according to the determined interface.