Serial Bus User Station Dual Phase Communication
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Solution Overview
Problem
Current serial bus systems, such as CAN and CAN FD, face limitations in data transfer rate and useful data capacity, particularly when compared to faster protocols like 100Base-T1 Ethernet, and struggle to maintain high error robustness while increasing data traffic.
Innovation Solution
A user station for a serial bus system that employs two communication phases with different bit rates, where the second phase has a higher bit rate for data transfer, allowing for a significant increase in data transfer speed and capacity up to 4096 bytes per frame while maintaining high error robustness, using a receiver and evaluation device to identify and switch between phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If higher clocking is used in the data fields to increase data transfer rate beyond 1 Mbit/s, then the bit rate increases, but the error robustness deteriorates
Solution Approach 1:
The message transmission is divided into two distinct communication phases: a first communication phase with lower bit rate for arbitration and control, and a second communication phase with higher bit rate for data transfer. This segmentation allows the system to maintain error robustness during arbitration while achieving high-speed data transfer during the data phase, resolving the contradiction between speed and reliability.
2Quantity of substance
If CAN FD message format is used to increase useful data length up to 64 bytes, then the data capacity increases, but the transfer speed remains slower compared to 100Base-T1 Ethernet
Solution Approach 1:
The system dynamically switches between two communication phases with different bit rates. The first phase operates at a lower bit rate for arbitration and control functions, while the second phase dynamically switches to a higher bit rate for bulk data transfer. This dynamic adaptation allows the system to achieve both high data capacity (up to 4096 bytes per frame) and high transfer speed (at least 10 Mbps), overcoming the limitations of static CAN FD implementations.
3Speed
If two communication phases with different bit rates are used to increase transfer rate, then the data transfer speed increases, but the device complexity increases
Solution Approach 1:
The evaluation device preliminarily analyzes the reception signal to identify the current communication phase before data transfer begins. By detecting phase transition indicators in advance, the system prepares for the bit rate switch, allowing the transceiver device to reliably transition from the first communication phase to the second communication phase without complex real-time decision-making, thus managing device complexity while achieving high transfer rates.
Data Source
AI summary
A user station for a serial bus system. The user station includes a receiver for receiving a signal from a bus of the bus system, and a device for evaluating the reception signal that is output by the receiver. The receiver generates a digital reception signal from the signal received from the bus and to output the signal to the device at a terminal. The device evaluates the digital reception signal with regard to a predetermined communication protocol that establishes when a predetermined communication phase, which indicates a subsequent transfer of useful data in a message, begins and ends. The device reverses the data flow of the digital reception signal to the receiver at the terminal for a time period of at least one bit if the evaluation of the device shows that data at that time are being received from the bus in the predetermined communication phase.