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SoCs drive high-end automotive displays

Posted: 03 Oct 2011 ?? ?Print Version ?Bookmark and Share

Keywords:SoC? 3D graphics? automotive display?

Renesas Electronics Corp. has unveiled the SH7769, an SoC for high-end automotive display systems (graphics cluster, multifunction graphics display) that supports advanced human machine interfaces (HMI). According to Renesas, the SoC boosts video input and display output performance and enables high-reliability systems.

The SH7769 implements functions essential for automotive display systems such as 3D graphics meters and central displays that according to Renesas, are markets that are expected to grow rapidly. Due to the recent increase in demand to process enormous volumes of information through in-car network and multimedia systems, car information systems are required to deliver this information to the driver clearly and safely. The SH7769 SoC offers a high-function 3D graphics engine and display units that allow 1600 x 480-pixel HD video decoding. A GUI display can be used to express and deliver a realistic instrument-cluster system and in-vehicle information to the driver. This GUI allows realistic 3D graphics display and improved operability.

Up to three video data streams can be processed simultaneously to provide information from external vehicle cameras, navigation systems and night vision devices. The SH7769 SoC also contributes to the reduction of system costs by integrating an NTSC decoder.

The SoC implements two channels of image compensation. The IMR-LSX is dedicated for camera-image distortion while the IMR-X is dedicated for compensation of a given image. The IMR-LSX channel can flatten the distortion of a fish-eye image. This hardware processing can achieve lower power consumption and higher speed operation compared to that with the same function implemented on the CPU, said the company. The IMR-X channel can transform the image data into a given form and can be used as a head-up display (HUD) image conversion.

The SH7769 SoC is also capable of converting one digital-image input channel and one digital-image output channel for HUD simultaneously. A DDR3-SDRAM interface (16bit dedicated bus at 533MHz) with a capability of 1067 mega words per second (M words/s) is implemented on the SH7769 SoC that achieves maximum transfer rate of 2.13GB/s.

Each device in the R-Car series will be offered with a dedicated power supply IC, the R2A11301, known as a multivoltage regulator. This IC realizes highly accurate output voltage within one percent of voltage variation, with two outputs implemented for the CPU core and for DDR (DDR2/DDR3) as a depressor, Renesas noted. An integrated AVS function enables optimum control of the output voltage to the SoC that saves up to 20 percent (estimating with an AVS [35mV]) of power, added the company. As a finished, tested solution, system designers can reduce the time needed for developing complex, discrete power systems and speed their time to market.

The Physical Address Management (PAM) and Display Compare Unit (DISCOM) are integrated into the SH7769 to detect system malfunctions and to ensure high reliability. PAM limits and monitors accesses from the CPU or GPU to memory or peripherals. In cases where an unexpected access has occurred, the function can invalidate the access and generate an interrupt to the CPU. The DISCOM monitors and compares every frame of data to be output and the actual output data.

The SH7769 device is packaged in a 496-pin BGA (ball-grid array, 21 x 21mm) package with 0.8mm ball pitch. Samples of Renesas' SH7769 SoC are available for $60 per unit. Mass production is scheduled to begin June 2013 and is expected to reach a cumulative 30,000 units per month in June 2014.

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