Serial Bus Subscriber Station Re-Integration for CAN Synchronization
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Solution Overview
Problem
In serial bus systems, subscriber stations can incorrectly remain in a re-integration state due to asynchronous synchronization, leading to communication errors when switching between different communication standards and bit rates, particularly in CAN-based systems like CAN FD and CAN XL.
Innovation Solution
A subscriber station with a communication control device and re-integration module that synchronizes communication phases by checking predetermined re-integration conditions, ensuring correct transition from re-integration to arbitration mode, using bit sequences with varying values to avoid synchronization errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If subscriber stations use different communication standards and bit rates in CAN-based bus systems, then the system can support multiple communication requirements and data volumes, but synchronization errors occur during re-integration leading to communication failures
Solution Approach 1:
The patent applies preliminary action by having subscriber stations check for the presence of a transmitting station before attempting re-integration. This preliminary check prevents premature re-integration attempts that would cause synchronization errors, ensuring that re-integration only occurs when the bus is ready to accept new participants.
Solution Approach 2:
The patent implements feedback mechanisms where subscriber stations continuously monitor the bus state and use this information to determine whether re-integration should be attempted. The feedback from detecting the absence of a transmitting station prevents erroneous re-integration decisions and maintains synchronization accuracy.
2Productivity
If subscriber stations switch between slow arbitration phase and fast data phase bit rates, then high data transmission rates are achieved, but error robustness decreases due to synchronization difficulties
Solution Approach 1:
The patent applies preliminary action by checking for the presence of a transmitting station before initiating re-integration. This ensures that rate switching operations are performed only when appropriate, preventing synchronization errors that would occur if re-integration attempted during unstable transition periods.
Solution Approach 2:
The patent implements self-service by having each subscriber station independently monitor bus conditions and make autonomous decisions about re-integration timing. This self-regulated approach ensures that each station only re-integrates when the bus state indicates safety, maintaining error robustness during rate transitions.
3Loss of time
If subscriber stations attempt re-integration immediately after detecting idle conditions, then quick recovery from error states is achieved, but synchronization errors occur with other stations
Solution Approach 1:
The patent applies preliminary action by adding a check for the presence of a transmitting station before allowing re-integration. This preliminary verification prevents premature re-integration that would cause synchronization errors, while still enabling quick recovery by allowing re-integration as soon as the bus is truly ready.
Solution Approach 2:
The patent uses the detection of transmitting station presence as an intermediary condition between idle condition detection and re-integration execution. This intermediary check acts as a gatekeeper that ensures re-integration only proceeds when the bus state confirms safety, preventing synchronization conflicts.
Data Source
AI summary
A subscriber station for a serial bus system. The subscriber station has a communication control device, and a re-integration module for re-integrating the communication control device into a communication on the bus to temporally synchronize the communication control device to a signal transmitted from the at least one other subscriber station of the bus system, which signal is created based on a frame for communication in the bus system. The re-integration module checks at least one predetermined re-integration condition to decide whether the operating mode of the communication control device is or is not to be switched into an operating mode for transmitting frames to the bus and/or for receiving frames from the bus, and uses in its check at least one predetermined re-integration condition having a sequence of bits in which the value of the last bit differs from that of the preceding bits.