JPH02236758A - Bus protection system - Google Patents

Abstract

PURPOSE:To prevent all the low-order agents from being set at inoperable states due to the defect of one low-order agent by connecting a hardware block to separate each low-order agent from a bus when a bus cutoff signal is set at every low-order agent. CONSTITUTION:The bus protection system is comprised of a high-order agent 1, the low-order agents 2-4, the bus 5, bus cutoff signal lines 6-8, and the hardware blocks 9-11. When a fault occurs in a first low-order agent 2 and malfunction occurs in a signal on the bus 5, the high-order agent 1 sets the bus cutoff signal on the bus cutoff signal line 6, and sets all the first hardware blocks 9 at disabled states, and separates the first low-order agent 2 from the bus 5 completely. Thereby, it is possible to surely separate a faulty low-order agent from the bus and to protect the bus even if the fault occurs in the low-order agent connected to the bus.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of an information processing device, and particularly to a bus maintenance method thereof.

(Prior Art) Conventionally, in this type of information processing device, it is not possible to disconnect each lower-level agent from a higher-level agent in terms of hardware, and a state of disconnection between the upper-level agent and lower-level agents from the bus is created by sending and receiving messages. ● (Problem to be solved by the invention) In the conventional information processing device described above, each lower agent cannot be separated from the upper agent in terms of hardware, so if one of the lower agents breaks down, If this occurs, the disadvantage is that this failed lower agent may have an adverse effect on the bus, causing all lower agents to become inoperable.

An object of the present invention is to provide an information management device configured to connect a higher-level agent and a plurality of lower-level agents by a bus, in which a bus disconnection signal is given from the higher-level agent to each lower-level agent. The above drawback is eliminated by connecting a hardware block to each lower agent to disconnect each lower agent from the bus when the bus is set, so that a failure in one lower agent will render all lower agents inoperable. The purpose is to provide nine bus protection methods that are configured so that they will not be damaged.

(Means for Solving the i! Problem) The bus maintenance system according to the present invention includes a higher-level agent, a plurality of lower-level agents, a bus, and a plurality of hardware blocks.

The upper level agent is one that can send a bus disconnect signal. A bus is used to connect a higher-level agent and multiple lower-level agents. The plurality of hardware blocks are inserted between the bus and the plurality of lower-level agents to disconnect each of the plurality of lower-level agents from the bus when the bus disconnect signal is set.

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

FIG. 1 is a block diagram illustrating one embodiment of a bus protection scheme according to the present invention.

In FIG. 1, 1 is a higher level agent, 2 to 4 are first to third lower level agents, 5 is a bus, and 6 to 8
are the first to third bus disconnection signal lines, respectively, and 9 to 1l are the first to third hardware blocks, respectively. As shown in FIG.
bus disconnection signal line 6, second bus disconnection signal line 7, third bus disconnection signal line 8, first hardware block 9, second hardware block 10, and third hardware block. It consists of a wear block l1. If the first lower agent 2 is malfunctioning and causing the signal on the bus 5 to malfunction, the second lower agent
Also, it may become impossible to access from the third lower agents 3 and 4. In such a case, the upper level agent 1 uses the first bus disconnection signal line 6.
The upper bus disconnection signal is set to completely disable the first hardware block 9 and completely disconnect the first lower agent 2 from the bus 5. As a result, the second and third lower agents 3 and 4 become operational. (Effects of the Invention) As explained above, the present invention enables a bus disconnection signal to be sent from a higher-level agent to a lower-level agent, and disconnects the bus from the lower-level agent. By connecting hardware blocks that can connect to the bus, even if a lower-level agent connected to the bus fails, the higher-level agent can set the corresponding bus disconnection signal, ensuring that the failed lower-level agent is disconnected from the bus. This has the effect of being able to protect the bus by separating it from the bus.

According to the present invention, it is considered that the failure rate of the lower agents/arts becomes much higher than the failure rate of the hardware block for disconnecting the bus from the lower agents.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating one embodiment of a bus protection scheme according to the present invention. 1... Upper agents 2 to 4... Lower agents 5... Buses 6 to 8... Signal lines

Claims (1)

[Claims] a higher-level agent capable of sending a bus disconnect signal; a plurality of lower-level agents; a bus for connecting the upper-level agent and the plurality of lower-level agents; A bus protection system comprising: a plurality of hardware blocks inserted between the bus and the plurality of lower-order agents in order to separate the plurality of lower-order agents from the bus.