Sensor Interface Circuit Timeout Error Handling
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Solution Overview
Problem
Sensor interface circuits face challenges in detecting and managing timeout errors due to delayed arrival of pixel data from image sensors, which can bottleneck subsequent processing stages.
Innovation Solution
A sensor interface circuit is designed with queues, an error detection circuit, and an unpacking circuit that generates a timeout signal when valid pixel data is not received within a defined time limit, allowing the generation of a dummy frame to prevent bottlenecks in processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor interface circuit waits for valid pixel data from image sensors, then data processing accuracy is improved, but processing delay increases when data arrives late
Solution Approach 1:
The circuit performs preliminary error detection by monitoring for the presence of valid pixel data within an expected time window. When timeout error is detected (no valid data received), the circuit proactively generates a dummy frame in advance, preventing subsequent processing stages from waiting indefinitely and reducing overall processing delay while maintaining data integrity through error flags.
2Productivity
If the sensor interface circuit detects timeout errors and generates dummy frames, then continuous processing is improved, but circuit complexity increases
Solution Approach 1:
The circuit introduces an intermediary error detection and timeout monitoring mechanism between the pixel data reception and processing stages. This intermediary component detects timeout errors and generates dummy frames with error flags, allowing subsequent processing stages to continue operation without interruption while being aware of the data quality issue, thus maintaining productivity without excessive complexity increase.
3Reliability
If subsequent circuits wait for valid pixel data, then data integrity is improved, but processing throughput decreases
Solution Approach 1:
The circuit segments the pixel data stream into valid data frames and timeout error cases, handling each differently. For timeout errors, dummy frames are generated with error flags to maintain data stream continuity and throughput, while valid data frames are processed normally with full integrity checks. This segmentation allows subsequent circuits to process both types without interruption, maintaining throughput while preserving integrity for valid data.
Data Source
AI summary
Embodiments relate to detecting a timeout error on receipt of valid pixel data from an image sensor by a sensor interface circuit. When the valid pixel data is not timely received at the sensor interface circuit, a timeout error signal is generated by the sensor interface circuit. A time limit for determining the timeout error signal may be defined by a global clock that provides a clock signal to the sensor interface circuit and other circuits. As a result, the sensor interface circuit generates a dummy frame and sends out the dummy frame to subsequent circuits so that the timeout error does not bottleneck subsequent processing stages. In contrast, if the valid pixel data is timely received, sensor data received from the image sensor is unpacked into a frame of pixels.