Serial Bus Interface Module Bit Time Configuration
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Solution Overview
Problem
Existing serial bus systems, such as CAN FD, face challenges in achieving high data rates with high error robustness while maintaining signal quality and reducing complexity and costs.
Innovation Solution
An interface module for a communication control device in a serial bus system that configures bit times for different communication phases, uses a modulator for pulse-width modulation, and ensures reliable switching of the operating mode of the transmitting/receiving device, allowing for independent configuration of bit times and maintaining signal symmetry without complex line coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the data transmission rate is increased beyond CAN FD capabilities, then the productivity is improved, but the reliability deteriorates due to higher transmission errors from incorrect switching of operating modes
Solution Approach 1:
The communication protocol is segmented into distinct phases: a first communication phase for arbitration at a lower bit rate and a second communication phase for data transmission at a higher bit rate. This segmentation allows the system to achieve high productivity during data transmission while maintaining reliability during arbitration, resolving the contradiction between speed and error robustness.
Solution Approach 2:
The system dynamically switches between different operating modes of the transmitting/receiving device corresponding to the different communication phases. The interface module controls the switching to match the bit rate changes, enabling the system to adapt its performance characteristics to the current communication needs and resolve the contradiction between high speed and high reliability.
2Measurement precision
If the edge steepness of received signal bits is increased to improve decoding precision, then the measurement precision is improved, but the object-generated harmful factors worsen due to increased radiation
Solution Approach 1:
The system changes the parameter of bit time duration between the two communication phases. By using longer bit times in the first phase and shorter bit times in the second phase, the system achieves sufficient edge steepness for reliable decoding without excessively increasing radiation, thus resolving the contradiction between measurement precision and harmful emissions.
3Productivity
If the payload length is extended to increase data throughput, then the productivity is improved, but the device complexity increases due to more complex line coding requirements
Solution Approach 1:
The communication is segmented into two phases with different bit rates. The first phase handles arbitration with simpler requirements, while the second phase handles high-speed data transmission. This segmentation allows extended payload lengths to be transmitted efficiently without requiring complex line coding throughout the entire communication process, thus improving productivity while controlling device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables significant increases in bit rate and transmission speed while ensuring high error robustness, achieving a net data rate of at least 10 Mbps and supporting payload sizes up to 4096 bytes per frame.
Implementation Method 1
a modulator for modulating a transmission signal into a modulated transmission signal having the bit time of the second communication phase configured in the at least one configuration register
Data Source
Figure 1~2
Figure 3
Figure 4~7
AI summary
The invention relates to an interface module (15; 150) for a communication control device (11; 110), a transmitting/receiving device (12; 32; 120) for a subscriber station (10; 30) of a serial bus system (1), and a method for communication in a serial bus system (1). The interface module (15; 150) has: - at least one configuration register (151 to 154) for configuring the bit time (T_B1) of a first communication phase (451, 452, 454, 455) of a frame (450) and/or the bit time (T_B2) of a second communication phase (453) of the frame (450), by means of which frame messages (45; 46) are exchanged between subscriber stations (10, 20, 30) of the bus system (1); and - a modulator (156) for modulating a transmission signal (TxD_PRT) to form a modulated transmission signal (TxD_PWM), which has the bit time (T_B2) of the second communication phase (453), which bit time is configured in the at least one configuration register (151 to 154) and differs from the bit time (T_B1) of the first communication phase (451, 452, 454, 455). The interface module (15; 150) is designed to output the transmission signal (TxD_PRT) input into the modulator (156) to a transmitting/receiving device (12; 120) of the subscriber station (10) in the first communication phase (451, 452, 454, 455) in order to transmit the transmission signal (TxD_PRT) onto a bus (40) of the bus system (1). The interface module (15; 150) is also designed to output the modulated transmission signal (TxD_PWM) produced by the modulator (156) to the transmitting/receiving device (12; 120) of the subscriber station (10) in the second communication phase (453) in order to transmit the modulated transmission signal (TxD_PWM) onto a bus (40) of the bus system (1).