SPI Bus Frame Sequencing for Synchronous Data Integrity
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Solution Overview
Problem
The existing SPI protocol lacks data integrity control and does not enable simultaneous two-way communication, making it unsuitable for applications requiring maximum functional safety in motor vehicle systems, such as mutual verification between computers via a full-duplex synchronous communication.
Innovation Solution
The method involves encapsulating data in frames with a frame identifier and control field, including a checksum, and using a predetermined sequencing for simultaneous frame exchange between master and slave communication modules, with integrity checking steps to detect communication errors and interrupt transmission upon error detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the SPI protocol is used for synchronous data transmission, then transmission speed and simultaneous two-way communication are improved, but data integrity control and error detection are lost
Solution Approach 1:
The data transmission is segmented into structured frames with distinct fields: frame identifier (for error detection and sequencing), data field (for payload), and control field (for additional control information). This segmentation allows simultaneous optimization of transmission efficiency and data integrity verification.
Solution Approach 2:
The receiving module verifies data integrity by checking the frame identifier against expected values and validates the control field content. Error detection feedback mechanisms are implemented to identify transmission errors without requiring retransmission protocols, maintaining high-speed communication while ensuring reliability.
2Reliability
If frame structure with identifiers and control fields is added to SPI protocol, then data integrity and error detection are improved, but communication protocol complexity increases
Solution Approach 1:
The frame structure implements local quality by dedicating specific fields for specific functions: frame identifier for error detection, control field for transmission control, and data field for payload. This localized functional assignment simplifies the verification process at each stage while maintaining overall protocol simplicity.
3Loss of time
If simultaneous two-way communication is implemented, then response time is reduced, but error detection and mutual verification become difficult
Solution Approach 1:
The communication protocol implements periodic action through predetermined sequencing of frame identifier pairs. Each transmission cycle follows a defined sequence where master and slave modules exchange frames with correlated identifiers, enabling mutual verification of synchronous communication while maintaining real-time response capabilities.
Data Source
AI summary
The invention concerns the transmission of synchronous data between a master communication module and a slave communication module via a serial data bus, in particular a SPI bus. According to the invention, the data to be transmitted by each of the two master and slave communication modules are encapsulated in a data field (31) of at least one frame further comprising a frame identifier (30), and two frames are exchanged simultaneously between the two master and slave communication modules according to at least one predefined sequencing corresponding to a unique pairing of the identifiers of the two frames exchanged simultaneously. The integrity of a communication can therefore be controlled by verifying the sequencing of the exchanged frames.