JPS63118850A - Method for recording message history - Google Patents

Abstract

PURPOSE:To record also an invalid message by transmitting the messages containing the same contents to a recording unit every time one of remaining units transmits a message and recording these messages of the same contents via the recording unit. CONSTITUTION:A unit 2 transmits a message 10 to a unit 4 and then sends a message 11 containing the same contents as the message 10 to a recording unit 5 regardless of a positive or negative answer. The unit 5 applies a control system where the negative answers are avoided as much as possible. While the unit 2 must transmit messages continuously until a positive answer is received when a negative answer is received. Then the unit 5 records the message 11 received normally. In such a way, the same operation is repeated every time the units 2-4 transmits messages.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a message history recording method for a message transmission bus used in a microprocessor system of about 32 bits. In particular, the present invention relates to a message history recording method for recording message transmission and reception between units.

〔overview〕

The present invention provides a message history recording method for a bus for message transmission, in which one or a small number of units out of a plurality of units connected to this bus are set as recording units, and messages are exchanged between units other than this recording unit. Each time the remaining unit sends a message, it sends a message containing the same content to the recording unit, and the recording unit records the message containing the same content, thereby transmitting the message. It is possible to record the transmission and reception of messages between units on the bus, including invalid messages that were not picked up.

[Conventional technology]

A plurality of units connected to a bus for message transmission, each having its own microprocessor, together form a single device.

Conventionally, in the message history recording method of these devices, one microprocessor sequentially records messages sent by itself and messages received by itself in its own memory.

[Literature]

Multipath bus architecture published by Intel Corporation -1-
Handbook 146077-B (MULTIBLISI
I BusARCIIITECTtlRE 5PECI
FICATION HANDBOOK 146077-
8).

[Problem that the invention seeks to solve]

However, this traditional message history recording method
Although it is possible to record messages that one microprocessor can Fi+ by itself, there is a drawback that messages that cannot be recognized by the microprocessor, that is, invalid messages as shown below, cannot be recorded.

The message transmission confirmation method on the message transmission bus is such that after the sending side sends a message, the receiving side hardware returns a response to the message. These responses include normal responses indicating that the message has been accepted, and negative responses indicating that the message cannot be accepted due to some reason, such as a busy reception buffer. Here, a message that ends with a negative response is called an invalid message.

Therefore, the conventional message history recording method has the disadvantage that it is not possible to measure the frequency of occurrence of invalid messages in a certain unit, that is, the degree of message contention.

The present invention solves the above-mentioned drawbacks and aims to provide a message history recording method capable of recording message transmission and reception between units on a bus for message transmission, including invalid messages that are not picked up.

[Means for solving problems]

The present invention provides a message history recording method for recording, for each unit, mutual message transmission and reception by a plurality of units connected to one message transmission bus.
One or a small number of the above units are set as recording units, messages are sent and received between the remaining units excluding this recording unit, and each time one of the remaining units sends a message, The present invention is characterized in that a message containing the same content as the message to be transmitted is sent to the recording unit, and the recording unit records the message containing the same content.

[Effect]

One or a small number of units among the plurality of units are set as recording units. Messages are sent and received between the remaining units excluding this recording unit, and each time the remaining one sends a message, it sends a message containing the same content to the recording unit. The recording unit records messages containing this same content. Through the above operations, it is possible to record message transmission and reception between units on the message transmission bus, including invalid messages that were not picked up.

〔Example〕

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

The figure is a block diagram of a message history recording device according to an embodiment of the present invention. In the figure, the message history recording device includes a bus 1 for message transmission (with a message delivery function), units 2 to 4 that mutually send and receive messages via bus 1, and units 2 to 4 that transmit messages. and a recording unit 5 for receiving and recording messages containing the same content transmitted each time.

The operation of the message history recording device having such a configuration will be explained. In the figure, a procedure in which unit 2 transmits message 10 to unit 4 will be explained.

First, unit 2 sends message 10 to unit 4. Regardless of whether the response is a normal response or a negative response, the unit 2 also transmits a message 11 containing the same content as the message 10 to the recording unit 5°.

Messages that contain the same content mean that messages cannot be sent as exactly the same message because the message contains the address of the recipient. Also, it would be more useful if the message sent to unit 5 included the format of the response transferred by unit 2 from unit 4.

The unit 5 operates using a control method that does not return negative responses as much as possible. Further, as part of the operation of the unit 2, when a negative response is received, it is necessary to retransmit until a normal response is received.

Unit 5 receives normally received message 1 containing the same content.
Record 1. As described above, units 2 to 4 repeat the same operation every time they send a message.

〔Effect of the invention〕

As described above, the present invention has the excellent effect of being able to record message communications between units on a message transmission bus, including invalid messages.

Furthermore, by analyzing the records, there is an advantage that the degree of message contention occurring in one unit can be measured.

[Brief explanation of the drawing]

The figure is a block diagram of a message history recording device according to an embodiment of the present invention. l... Bus for message transmission, 2.3.4... Unit, 5... Recording unit, 10... Message, 11... Message containing the same content as message 10.

Claims (1)

[Claims] (1) In a message history recording method in which mutual message transmission and reception performed by multiple units connected to one message transmission bus is recorded for each unit, one or a small number of the above-mentioned multiple units are recorded. Messages are sent and received between the remaining units except this recording unit, and each time one of the remaining units sends a message, the message to be sent is sent to the recording unit. A message history recording method characterized in that: a message containing the same content is transmitted, and the recording unit records the message containing the same content.