COMMUNICATION APPARATUS

• US 20100306422A1
• Filed: 05/25/2010
• Published: 12/02/2010
• Est. Priority Date: 05/26/2009
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: KISHIGAMI, Tomohisa, KODAMA, Tomoko
• Application Number:
  US12/787,010
• Publication Number:
  US 20100306422A1
• Time in Patent Office: Days
• US Class Current: 710/30
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]

Abstract

The present invention provides, as one aspect, a communication apparatus which is connected with a communication bus and performs communication using Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA). The apparatus includes an edge detection section which detects an edge of data on the communication bus, and a data obtaining section which obtains data from the communication bus to determine a collision of data on the communication bus after a predetermined delay time period has passed from the time at which the edge detection section detects the edge.

Claims

1. A communication apparatus which is connected with a communication bus and performs communication using Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), comprising:

an edge detection section which detects an edge of data on the communication bus; and

a data obtaining section which obtains data from the communication bus to determine a collision of data on the communication bus after a predetermined delay time period has passed from the time at which the edge detection section detects the edge.

2. The apparatus according to claim 1, further comprising a clock circuit which produces a clock signal, wherein

the data obtaining section obtains data from the communication bus when the number of detected edges of the clock signal becomes equal to or more than a predetermined value.

3. The apparatus according to claim 1, wherein the apparatus is incorporated into a vehicle.

4. The apparatus according to claim 1, wherein a frame format of a communication protocol employed in the apparatus is a frame format of a Controller Area Network (CAN) protocol.