At one point, the auto industry continued to add more and more sensors and electronic control units to vehicles. All of these sensors and actuators connected via CAN and LIN buses. However, since the introduction of the In-Vehicle Network (IVN), the industry has started to replace these buses with automotive Ethernet. According to NXP, “Ethernet enables broadband connectivity with the latency and predictability needed for advanced control functions and motion video. At the same time, it reduces vehicle weight, saves energy, increases efficiency and enables flexible software upgrades and hardware modularity. This makes autonomous driving more affordable.
The IEEE standards organization has added time-sensitive networking (TSN) capabilities to existing Ethernet to meet the time-sensitive, critical and deterministic latency requirements of the automotive industry. Let’s take a look at those TSN features that made the adoption of TSN Ethernet so fast.
Pre-emption: The preemption and spacing functions allow critical data to interrupt the transfer of non-critical data in progress. After the critical frame data transfer is complete, the non-critical data transfer resumes and ends.
Time Conscious Shaper: Predictable and deterministic latency for critical data remains unlocked.
Accurate time protocol: The Precision Time Protocol is a protocol used to synchronize the clocks on a network.
Cyclic queue and transfer: This algorithm provides a deterministic delay whatever the topology of the network.
Filtering and flux polishing: This feature detects and eliminates troublesome transfers and provides a secure and robust network.
Replication and elimination of frames: This feature provides data redundancy and frame replication whenever the same frame is transferred to multiple paths on a network.
Audio-video transport protocol: This protocol provides non-critical audio / video data transfer for information entertainment.
With the availability of rate verification IP for 100 / 1000baseT and TSN, users can start working with these specifications immediately, ensuring compliance with the standard and realizing the fastest path to IP verification closing and SoC. The 100 / 1000GBaseT and TSN provide a complete solution including support for PHY, MAC and TSN layers with full coverage model and protocol verifiers. Ethernet TSN VIP covers all TSN functionality required for full coverage verification shutdown. More details are available in Ethernet Verification IP Wallet.
Krunal Patel is Chief Product Engineer at Cadence.