JPH02287663A - Bus control system - Google Patents

Abstract

PURPOSE:To execute the construction of a more flexible computer system by connecting simultaneously plural boards for peripheral equipment interface having the same arbitration level to the computer so that they can be controlled. CONSTITUTION:At the time of a bus use processing, an arbitration level management table 1b is retrieved by using an informed arbitration level as a key, and whether its arbitration level is being used at present or not is checked. In the case the informed arbitration level is unused, information is updated so that the informed arbitration level is being used, to the arbitration level management table 1b. Subsequently, a local bus arbiter function control mechanism le is controlled, an instruction is outputted to a local bus arbiter function control mechanism managing means 1f so that a function of a local bus arbiter 1d of a target board for peripheral equipment interface becomes effective. In the end, a bus use permission notice is outputted to a program 1a.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention makes it possible to connect peripheral device interface boards having the same arbitration level to a computer main body in a computer system that determines the right to use a bus based on the arbitration level. This relates to a bus control method for

[Conventional technology]

In a computer system where the right to use the bus is determined by the arbitration level of the peripheral device interface board, a certain peripheral device interface board has a different arbitration level from other peripheral device interface boards, and the right to use the bus is determined in the arbitration phase. The peripheral interface board with the higher arbitration level wins the bus and uses the computer's bus.

[Problem to be solved by the invention]

With the above-described conventional bus control method using arbitration levels, no problem occurs when peripheral device interface boards with different arbitration levels are connected to a computer. However, since the arbitration level determines the right to use the bus for peripheral device interface boards, if multiple peripheral device interface boards with the same arbitration level are connected, arbitration level conflict will occur and normal operation will not be achieved. There is a problem.

[Means to solve the problem]

The configuration of the bus control method of the present invention is such that, in a computer system that has an arbitration bus and a local bus arbiter and controls the bus, the local bus arbiter function control controls activation and deactivation of the bus arbiter on a peripheral device interface board. The present invention is characterized in that it includes a mechanism, and arbitration management means that manages the used/unused state of each arbitration level and avoids arbitration level conflicts.

〔Example〕

Next, the present invention will be explained.

FIG. 1 is a block diagram showing the flow of operation of an embodiment of the present invention, in which 1a is a program that uses a computer bus;
1b is an arbitration level management table, IC is an arbitration level management means, 1d is a local bus arbiter for a peripheral device interface board, 1e
1f is a local bus arbiter function control mechanism that enables or disables the function of the local bus arbiter, and 1f is a local bus arbiter function control mechanism management means. 2 to 4 are execution flowcharts of each process in FIG. 1.

Next, looking at FIG. 2, in step 2a, program la (hereinafter referred to as program 1a) that uses the computer bus notifies the arbitration level management means IC of information regarding the arbitration level used by program 1a. . Depending on whether the notification is a bus usage notification or a bus release notification, the process branches into a bus usage process (step 2b) and a bus release process (step 2b).

Next, looking at Figure 3, in the bus usage process step 3a
Then, the arbitration level management table 1b is searched using the notified arbitration level as a key, and it is determined whether the arbitration level is currently being used. Depending on whether the notified arbitration level is unused, the process branches to step 3b. If the notified arbitration level is unused, arbitration level management table 1 is
b, update the information so that the notified arbitration level is in use.Step 3C), Step 3
In step d, the local bus arbiter function control mechanism is controlled and an instruction is issued to the local bus arbiter function control mechanism management means so that the local bus arbiter function of the target peripheral device interface board is enabled. ! ! After L, in step 3e, a bus use permission notification is issued to the program 1a.

On the other hand, if the arbitration level notified by program 1a is currently in use, a bus use prohibition notification is issued to program 1a (step 3).
f).

This process prevents malfunctions in the bus arbitration phase due to competition between the currently used arbitration level and another peripheral device interface board having the same arbitration level.

Next, looking at FIG. 4, when a bus release request is made by program 1a, in the bus release process step 4a
In step 4b, update the information in the arbitration level management table so that the arbitration level notified to the program 1a is unused; in step 4b, control the local bus arbiter function control mechanism;
An instruction is issued to the local bus arbiter function control mechanism management means to disable the local bus arbiter function of the target peripheral device interface board. This processing allows other peripheral device interface boards having the same arbitration level to use the computer bus.

〔Effect of the invention〕

As explained above, the present invention improves the arbitration level for peripheral device expandability of a computer system by making it possible to simultaneously connect and control a plurality of peripheral device interface boards having the same arbitration level to a computer. The effect of this is that it is possible to avoid certain limitations and build a more flexible computer system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the flow of operation of an embodiment of the present invention, and FIGS. 2 to 4 are flow charts showing an overview of each process in FIG. 1. 1a...Program that uses the computer bus, 1b.
...Arbitration level management table, 1c...
- Arbitration level management means, 1d...Local bus arbiter of the peripheral device interface board, 1e...Local bus arbiter function control mechanism for enabling or disabling the function of the local bus arbiter of the peripheral device interface board, 1f. . . . Local bus arbiter function control mechanism management means, 2a . . . Processing means for determining whether the notification of the program 1a is a bus use notification or a bus release notification, 2b . . . Bus usage processing means, 2c . . .
Bus release processing means, 3a... Arbitration level management table updating means, 3b... Local bus arbiter function control mechanism management means, 3e... Bus use permission notification means, 3f... Bus use prohibition notification means, 4a ...
Arbitration level management table updating means, 4b
...Local bus arbiter function control mechanism management means.

Claims (1)

[Claims] In a computer system that has an arbitration bus and a local bus arbiter and controls the bus, there is a local bus arbiter function control mechanism that controls the operation and stop of the bus arbiter on the peripheral device interface board, and a local bus arbiter function control mechanism that controls the use and non-use of each arbitration level. 1. A bus control method comprising: arbitration management means for managing usage states and avoiding conflicts in arbitration levels.