Apparatus and method for transmitting data between two bus systems

• US 20020161960A1
• Filed: 04/22/2002
• Published: 10/31/2002
• Est. Priority Date: 04/20/2001
• Status: Active Grant

• Current Assignee: Harman Becker Automotive Systems GmbH (Samsung Electronics Co. Ltd.)
• Original Assignee: Harman Becker Automotive Systems GmbH (Samsung Electronics Co. Ltd.)
• Inventors: Bahren, Frank
• Granted Patent: US 7,089,343 B2
• Time in Patent Office: Days
• US Class Current: 710/305
• CPC Class Codes: G06F 13/4027 using bus bridges G06F13/4022 takes precedence

Abstract

An interface for transmitting messages between two bus systems including a receiver device for receiving a message from the first bus system, a classification device for classifying the message received from the first receiver device according to one of several predetermined classes, a translation device for translating the message based on a predetermined rule for each class into a message for transmission on the second bus system, and a transmitter device for transmitting the translated message on the second bus system.

Claims

1. An interface for transmission of messages between two bus systems, comprising:

a first receiver device for receiving a message from the first bus system;

a first classification device for classifying the message received from the first receiver device according to one of multiple predetermined classes;

a first translation device for translating the message into a message for transmission on the second bus system based on a rule specified for each class, and

a first transmitter device for transmitting the translated message on the second bus system.

2. The interface of claim 1, comprising:

a second receiver device for receiving a message from the second bus system;

a second classification device for classifying the message received from the second receiver device according to one of several predetermined classes,

a second translation device for translating the message into a message for transmission on the first bus system based on a rule specified for each class; and

a second transmitter device for transmitting the translated message on the first bus system.

3. The interface of claim 2, wherein said first and second classification devices defines the class of a received message based on a classification datum contained in the message.

4. The interface of claim 3, comprising a timer which, upon receiving a message from one of the bus systems, controls a cyclic transmission of the translated message on the other bus system.

5. The interface of claim 3, comprising a repetition-rate-adjustment device to control the transmission of the messages obtained by translation of messages transmitted on one of the bus systems at a first repetition rate, at a second repetition rate on the other bus system.

6. The interface of claim 5, characterized by a counter for counting the messages of a certain class arriving on one of the bus systems and for triggering transmission of the translated message on the other bus system when the count of the counter exceeds a limit.

7. The interface of claim 6, characterized in that, when the count of the counter exceeds a limit, it is reloaded with a predetermined value.

8. The interface of claim 7, characterized by a comparator for comparing a message of a given class received by one of the bus systems with a message of the same class previously received by the one bus system and for outputting the received message if its content differs from that of the previously received message of the same class.

9. The interface of claim 7, characterized in that the translation device includes a permutation unit for permuting elements of the received message.

10. The interface of claim 7, characterized in that the translation device includes an arithmetic unit for applying a mathematical computational rule to an element of the message.

11. The interface of claim 7, characterized in that the translation device is program-controlled and is connected to a memory for storing the rules for translation in program form.

12. The interface of claim 1, characterized in that the bus systems are a CAN bus system and a MOST bus system.

14. The method of claim 13, characterized in that said step of classifying includes identification of a classification datum in the message.

15. The method of claim 14, characterized in that, for at least one class of messages, said step of outputting is cyclically repeated.

16. The method of claim 15, characterized in that, for at least one class of messages, a received message is compared with a previously received message of the same class, and step of outputting is performed only if the content of the received message differs from that of the previously received message.

17. The method of claim 16, characterized in that the translation includes a permutation of the elements of the message.

18. The method claim 17, characterized in that the translation includes the application of a mathematical computational rule to an element of the message.

13. A method for transmitting a message from a first bus system to a second, comprising:

a) classifying the message received by the first bus system according to one of several predetermined classes;

b) selecting a translation rule based on the classification;

c) translating the message based on the translation rule; and

d) outputting the translated message on the second bus system.