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IP Review - CAN XL Bus Controller
ISO26262 soft IP SEooC and ASIL-B ready design
The CAN ALL IP Core stands as a comprehensive solution, covering the spectrum of automotive communication protocols, from established standards like CAN 2.0 to advanced protocols such as CAN FD, CAN FD Full, and the cutting-edge CAN XL technology.
The CAN FD serves as a bridge to APB, AHB, and AXI buses, operating as a standalone controller for the Controller Area Network (CAN) in automotive and industrial applications. Designed in strict accordance with ISO 11898-1:2015, it seamlessly aligns with:
- Bosch CAN 2.0B specification (2.0B Active)
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CAN FD (flexible data-rate)
- The latest CAN XL technology
This sophisticated controller features advanced error detection functions, enhancing communication reliability, and unique fault confinement mechanisms that ensure network-wide data consistency. Recognizing the crucial role of CAN in security and safety.
Breaking free from conventional CAN limits, the enhanced protocol enables data transmission speeds surpassing 1 Mbit/s, with a payload (data field) extending up to an impressive 64 bytes. During single-node transmission, the bit rate can be increased without the need for node synchronization. The core boasts a straightforward CPU interface (configurable data width of 8/16/32 bits) with a small or big-endian addressing scheme. Hardware message filtering (32 filters) and a 128-byte receive FIFO ensure efficient back-to-back message reception, minimizing CPU load. The IP Core is provided as HDL source code, making it adaptable for use in FPGA and ASIC technologies.
The IP core, available in two versions – Basic and Safety-Enhanced, incorporates robust support for CAN XL. The Safety-Enhanced variant, developed as an ISO26262-10 Safety Element out of Context, can be enhanced with necessary safety mechanisms. It includes comprehensive safety documentation, meeting ISO26262 soft IP SEooC required work products. This documentation encompasses a detailed Failure Modes Effects and Detection Analysis (FMEDA) with step-by-step instructions, facilitating integration into the customer’s system and system-level safety analysis. Rigorous third-party audits validate all safety-related work products.
Highlighting impressive performance metrics, the CAN XL technology not only facilitates data transmission speeds beyond 1 Mbit/s but also supports payloads of up to 64 bytes. This ensures a significant leap in communication efficiency, making it an ideal choice for advanced automotive applications.
The safety analysis reaffirms the fulfillment of safety metrics, with both IPs achieving the Automotive Safety Integrity Level ASIL-B (Single Point Fault Metric SPFM > 90%, Latent Fault Metric LFM > 60%). DCD-SEMI delivers a complete FMEDA analysis with instructions, ensuring a seamless integration process and robust system-level safety analysis.
This ASIL-B ready design effortlessly integrates into Automotive Safety Systems at the ASIL-B level, showcasing compatibility with the latest CAN XL technology.