Processing horsepower for the convergence of data streams: Page 6 of 6

July 03, 2014 // By Christoph Hammerschmidt
Processing horsepower for the convergence of data streams
Renesas Electronics’ second-generation R-Car range is the company’s response to the growing demand for automotive-enabled system-on-chip (SoC) processors for driver infotainment and assistance systems. With more than 25,000 Dhrystone MIPS CPU power and a 3D performance of 260 million triangles, the 8-core R-Car H2 is the flagship of this family based on the latest 28nm silicon process. This article presents the R-Car family’s scalability in a range of automotive applications and highlights the integrated hardware accelerators that enable developers to achieve compelling performance for their applications while keeping power consumption low.

an integrated, scalable cache solution. Each CPU has the usual combination of data and command caches, and the A15 and A7 cores each have their own L2 cache. This means that most data and command access can be kept out of the external memory. Without this type of caching, the eight cores would generate 60GB/s memory transfers, while with it this value can be reduced to a much more reasonable 3GB/s. The R-Car H2 uses an additional system cache that is available to all hardware accelerators, including the image recognition processor and the audio DSPs. The 3D graphics accelerator uses tile-based rendering, which uses on-chip memory to render graphics and minimises access to external memory. The external DDR3 SDRAM memory interfaces can be scaled from 16-bit to 64-bit providing memory bandwidth between 2.7 GB/s and 12.8 GB/s, depending on the performance required and the available power dissipation budget (See Fig. 3).

Fig 3: Cache architecture

With all these measures, Renesas has succeeded in developing a scalable application processor family (see Fig. 4) that enables customers to benefit from the performance of the fastest mobile processors available – devices designed to mitigate the challenges in the automotive field. It is now possible to achieve power consumption of under 5W for typical navigation applications. With the integration of image recognition processors and several video interfaces, the R-Car is well equipped for the upcoming driver assistance systems. The R-Car compatible product range allows developers to choose the appropriate product for their application and simply upgrade if the application requires it.

Fig. 4 R-Car generation 2 - A scalable family

About the author:

Peter Fiedler is Manager for Automotive Information Systems in the MCU Marketing & Engineering division of the Automotive Business Group, Renesas Electronics Europe.

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