DATA TRANSMISSION APPARATUS, COMMUNICATION CONTROL METHOD, AND COMMUNICATION CONTROL PROGRAM

• US 20150212958A1
• Filed: 10/19/2012
• Published: 07/30/2015
• Est. Priority Date: 08/03/2012
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Hara, Koutarou
• Granted Patent: US 9,703,736 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 13/362 with centralised access control
• CPC Class Codes: G06F 13/4221 being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus
• CPC Class Codes: H04L 12/40006 Architecture of a communication node current supply arrangements H04L12/10; intermediate storage or scheduling H04L49/90
• CPC Class Codes: H04L 12/40032 Details regarding a bus interface enhancer
• CPC Class Codes: H04L 12/4015 by scheduling the transmission of messages at the communication node
• CPC Class Codes: H04L 12/40163 by assigning priority to messages according to a message field
• CPC Class Codes: H04L 12/4135 using bit-wise arbitration
• CPC Class Codes: H04L 12/4625 Single bridge functionality, e.g. connection of two networks over a single bridge
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 47/6215 Individual queue per QOS, rate or priority

Abstract

A data transmission apparatus includes an output unit, when outputting data on a bus, to determine whether to output the data on the bus based on a result of a communication arbitration performed with competing data to be output on the bus, using priority information attached to the data; a storage unit to have areas set, the areas having respective priorities set for the communication arbitration, and to store a group of data having the consecutive priority information attached, in the respective areas; and a distribution unit to write the data having a transmission request received, in one of the areas in the storage unit, based on the priority information attached to the data. The output unit prioritizes outputting the data on the bus, the data being stored in the one of the areas having a higher priority, among the data stored in the areas.

Claims

1-6. -6. (canceled)

7. A data transmission apparatus, comprising:

an output unit configured, when outputting data on a bus, to determine whether to output the data on the bus based on a result of a communication arbitration performed with competing data to be output on the bus, using priority information attached to the data to be output on the bus by the data transmission apparatus itself;

a storage unit configured to have a plurality of areas set, the areas having respective priorities set for the communication arbitration, and to store a group of data having the consecutive priority information attached, in the respective areas; and

a distribution unit configured to write the data having a transmission request received, in one of the areas in the storage unit, based on the priority information attached to the data,

wherein the output unit prioritizes outputting the data on the bus, the data being stored in the one of the areas having a higher priority, among the data stored in the plurality of areas.

8. The data transmission apparatus, as claimed in claim 7, further comprising:

a plurality of flag storage units configured to be provided corresponding to the plurality of areas set in the storage unit, respectively,

wherein the distribution unit sets a flag in one of the flag storage units corresponding to one of the areas when data having the transmission request received is written in the one of the areas in the storage unit,

wherein the output unit prioritizes outputting the data stored in the one of the areas having the higher priority, among the areas in the storage unit corresponding to the flag storage unit having the flag set.

9. The data transmission apparatus, as claimed in claim 7, wherein the output unit outputs, with a highest priority, data not having been output on the bus for a certain period of time, among the data stored in any one of the plurality of areas, regardless of the priority of the area storing the data.

10. The data transmission apparatus, as claimed in claim 9, wherein the plurality of areas in the storage unit includes an exceptional area dedicated for storing data not having been output on the bus for the certain period of time,

wherein the distribution unit determines the data not having been output on the bus, and moves the determined data to the exceptional area from a corresponding one of the other areas,

wherein the output unit outputs the data stored in the exceptional area with the highest priority on the bus.

11. A data transmission method, executed by a data transmission apparatus configured, when outputting data on a bus, to determine whether to output the data on the bus based on a result of a communication arbitration performed with competing data to be output on the bus, using priority information attached to the data to be output on the bus by the data transmission apparatus itself, the method comprising:

writing the data having a transmission request received, in a storage unit, based on the priority information attached to the data, the storage unit being configured to have a plurality of areas set, the areas having respective priorities set for the communication arbitration, and to store a group of data having the consecutive priority information attached, in the respective areas; and

prioritizing outputting the data on the bus, the data being stored in the one of the areas having a higher priority, among the data stored in the plurality of areas.

12. A non-transitory computer-readable recording medium having a program stored therein for causing a data transmission apparatus to execute a process, when outputting data on a bus, to determine whether to output the data on the bus based on a result of a communication arbitration performed with competing data to be output on the bus, using priority information attached to the data to be output on the bus by the data transmission apparatus itself, the process comprising:

writing the data having a transmission request received, in a storage unit, based on the priority information attached to the data, the storage unit being configured to have a plurality of areas set, the areas having respective priorities set for the communication arbitration, and to store a group of data having the consecutive priority information attached, in the respective areas; and

prioritizing outputting the data on the bus, the data being stored in the one of the areas having a higher priority, among the data stored in the plurality of areas.