Serial Bus Receiver With Dual Thresholds For Conflict Detection
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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 in applications requiring higher bandwidth and error robustness, with CAN FD's maximum data rate being slower compared to Ethernet and its useful data length being insufficient for certain applications.
Innovation Solution
A device and method for a user station in a serial bus system that employs a receiver using multiple reception thresholds to detect transmission conflicts and manage data transfer, allowing for increased data rates and capacities up to 4096 bytes per frame while maintaining error robustness, by adapting thresholds based on communication phases and using a transceiver device to switch between operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If higher clocking is used in the data fields to increase data transfer rate, then the bandwidth is increased, but the error robustness deteriorates
Solution Approach 1:
The system dynamically switches between two communication phases: a first phase with lower bit rate and higher error robustness, and a second phase with higher bit rate and reduced error robustness. This dynamic adaptation allows the system to optimize performance based on current requirements while maintaining reliability through phase transitions.
Solution Approach 2:
The communication process is segmented into distinct phases with different characteristics. The first communication phase uses conventional CAN/CAN FD protocols with lower speed but higher reliability, while the second phase uses higher-speed transmission with adjusted reception thresholds. This segmentation allows each phase to be optimized for its specific function.
2Quantity of substance
If the useful data length is increased beyond 64 bytes in CAN FD, then the data capacity is improved, but the transmission time and error detection complexity increase
Solution Approach 1:
The system uses dynamic phase switching to handle long data transmissions. The first phase transmits the initial portion of data with high reliability, and the second phase continues transmission at higher speed. This allows arbitrarily long data lengths to be transmitted efficiently without being constrained by the 64-byte CAN FD limit.
3Measurement precision
If multiple reception thresholds are used in the second communication phase, then the detection precision of transmission conflicts is improved, but the device complexity increases
Solution Approach 1:
The receiver uses multiple reception thresholds (first reception threshold and second reception threshold) in the second communication phase to detect transmission conflicts with higher precision. The second threshold has a negative voltage value or a voltage value greater than the largest voltage driven by user stations, enabling reliable conflict detection even when both bus states are actively driven.
Data Source
AI summary
A device for a serial bus system. The device includes a receiver for receiving a signal from a bus, in which for a message that is exchanged between user stations of the bus system, the bus states of a signal received from the bus in the first communication phase differ from bus states of the signal received in the second communication phase. The receiver generates a digital signal based on the received signal, and outputs the signal to a communication control device to evaluate the data. The receiver uses a first reception threshold and a second reception threshold in the second communication phase to generate the digital signal. The second reception threshold has a negative voltage value or has a voltage value that is greater than the largest voltage value that is driven by a user station of the bus system for a bus state in the second communication phase.