Initially used for rear-view functionality and parking assistance applications, the use of vehicle cameras has since expanded to support 360-degree “surround view” functionality that expands what is seen by the system to every direction around the vehicle, helping to improve driver safety. To further optimize safety, vehicle camera video is also now being used in driver assist systems for braking, steering and providing obstacle detection warnings, for instance when changing lanes.

These sophisticated systems demand substantially higher processing performance in order to handle the expanded range of image recognition targets and increased processing load imposed by multiple cameras with higher pixel counts. Ethernet AVB offers features such as guaranteed bandwidth and synchronization of multiple cameras simultaneously, and a system involving additional cameras that can be flexibly upgraded. Moving forward, Ethernet AVB is expected to become the mainstream technology for automotive high-speed networking.

The R-Car T2 supports multiple standards (Note 1), including IEEE 802.1AS, IEEE802.1Qav, IEEE802.1Qat, and IEEE1722 standards. The R-Car T2 SoC features a built-in H.264 encoder developed exclusively by Renesas to provide low-latency compression while maintaining real-time high-quality HD video (1,280 × 960) transfer. Video can be compressed with extremely low latency of less than 1 msec (one-thousandth of a second) and delivered to multiple systems through the networks to vehicle systems. The high quality and real-time transfer create a high level of safety, making it possible to rapidly share camera footage with the advanced driver assist systems.

Previously, with the popularity of Ethernet as an easy-to-use network standard that allows video to be transferred to multiple systems, video compression was necessary as the maximum bandwidth supported by UTP cable (Note 2) is 100 Mbps, and latency was an issue in applications such as driver safety assist systems. Now Renesas has succeeded in reducing the latency time to less than 1 msec, which is equivalent to a movement distance of 2.8 cm when driving at 100 km/h.

This enables nearly real-time data transfer, allowing use in driver safety assist systems and making it possible to switch from the current LVDS system to Ethernet. In addition, convenient network support makes it possible to connect multi-display functionality and the building of advanced vehicle information systems that provide superior safety and comfort.

Features:

－ Compliant with four Ethernet AVB standards for enabling vehicle camera video sharing among multiple displays

－ Low-latency transfer of high-quality HD video that contributes to increasing the value of the car by video recognition

－ Ultra-low power consumption and small-size form factor for more power-efficient and compact camera modules