Receiver Architecture for FlexRay Signal Interpretation
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Solution Overview
Problem
Current receivers in automotive communication networks, such as those using the FlexRay protocol, face challenges in accurately interpreting bus signals due to noise and transient states, which can lead to errors and reduced reliability.
Innovation Solution
A receiver architecture that employs state machines to differentiate between bus states based on predetermined time periods, converting analog differential signals to digital signals and using clock generation units to sample signals, thereby reducing noise and improving signal interpretation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional receivers interpret bus signals without time-based state differentiation, then the device complexity is low, but measurement precision and reliability deteriorate due to noise and transient states
Solution Approach 1:
The receiver performs preliminary actions by measuring the duration of bus state transitions before making interpretation decisions. The state machine monitors how long a bus state persists (e.g., dominant state duration) and uses this time information to distinguish valid signal transitions from noise-induced transient states, thereby improving measurement precision before final signal interpretation occurs
Solution Approach 2:
A state machine is introduced as an intermediary component between the physical bus signal and the final digital interpretation. This state machine acts as a mediator that processes raw bus states through time-based logic, filtering out transient noise states and producing cleaned state sequences that improve overall signal interpretation accuracy without requiring complex filtering circuits
2Reliability
If state machines with predetermined time periods are used to differentiate bus states, then reliability improves by reducing noise interference, but device complexity increases
Solution Approach 1:
The invention changes the parameter of state duration from an unmonitored physical quantity to a measured and evaluated parameter. By introducing predetermined time periods as reference thresholds and measuring actual bus state durations against these thresholds, the system transforms raw signal states into reliability-filtered interpretations, distinguishing noise from valid signals through parameter comparison
Solution Approach 2:
The state machine performs self-service by autonomously monitoring its own state transitions and making decisions based on internal time period comparisons. The receiver uses its own operational states and internal timing mechanisms to filter noise and validate signals, eliminating the need for external validation circuits or additional complexity in the overall receiver architecture
Data Source
AI summary
In accordance with an embodiment, a receiver includes a receiving unit configured to receive a first received bus signal and a second received bus signal based on a bus input signal. The receiver also includes a first state machine configured to determine that a first output signal is a first symbol in response to the first received bus signal transitioning from a first bus state to a second bus state and staying in the second bus state for less than a first predetermined period of time, and a second symbol in response to the first received bus signal transitioning from the first bus state to the second bus state and staying in the second bus state for at least the first predetermined period of time. Additionally, the receiver includes a second state machine.