San Jose, Calif. Renesas Technology has launched a 600 MHz version of its SH7785 Superscalar 32-bit Microprocessor for automotive
infotainment systems and other high-performance multimedia systems that process 2D and 3D graphics. This is said to be the fastest device among all Renesas MPUs.
Embedded into the device is the high-end SH-4A superscalar CPU core with a floating-point processing unit (FPU) that achieves 4.2 GFLOPS performance for speeding up the generation of 3D graphics. The core’s 4-way set associative type cache memory includes the separate 32KBytes for instructions and another 32KBytes for data.
The on-chip multifunction display unit controls multiple overlapping display screens. Integrated into the SH7785 as an LCD panel controller, It can produce a superimposed display of up to three SVGA resolution (800 x 600 pixel) screens, or four WVGA resolution (800 x 480 pixel) screens, or six 480 x 234 pixel screens. It allows up to about 260,000 display colors for highly expressive image and video displays. The display unit also offers other advanced control capabilities, such as transparency processing and overwriting of text information during streaming video playback.
Because multimedia systems with fast, high-quality displays typically use external memory for a display data buffer, the SH7785 has a 300MHz, 32-bit dedicated bus. That bus can connect to high-speed DDR2-SDRAM (Double Data Rate 2 Synchronous DRAM), providing a maximum
data transfer rate of 2.4 Gigabytes/second.
Besides the LCD panel controller, a variety of other peripheral functions are integrated into the SH7785 to simplify and reduce the cost of embedded multimedia systems. There is a hardware data translation accelerator for moving-image playback provides high-speed execution of motion compensation, color data format conversion, and more. Used in combination with the display unit, it enables moving-image playback and display to be performed by the SH7785 alone.
A PCI bus controller enables easy, flexible system expansions that use existing inexpensive external PC peripherals. It also enables the implementation of sophisticated display functions via an external connection to a high-performance PCI-complaint device with 3D display functions.
Other on-chip peripherals include a direct memory access controller, interrupt controller, watchdog timer, various serial interfaces, and an interface for connection to an audio codec IC.
For more details of the processor, see block diagram below.
According to Renesas, the SH7785 offers 50 percent more speed and enhanced functions compared with the 400 MHz SH7780 that’s now in production. The higher levels of performance and functionality of the SH7785 are necessary to handle the rapidly increasing sophistication and expanding features of the latest multimedia systems. For example, some new car navigation systems show an annotated 3D picture of what the driver can see through the windshield. It’s based on the vehicle's location, speed and direction of motion.
The MPU has an on-chip debugging function that lets engineers perform real-time debugging at up to the device's 600MHz maximum operating frequency. An E10A-USB on-chip debugging emulator is available as a development environment and a full suite of software tools is offered. For the future, there will be an E200F full-spec emulator with enhanced debugging functions. It will be compatible with the SSTL18 trace interface comprising the new AUD high-speed trace system.
The 19 mm x 19 mm, 436-pin BGA package of the SH7785 microprocessor is about 20 percent smaller than the current SH7780 package, aiding the creation of compact embedded systems. An
environment-friendly lead-free version of the BGA package is also available. The SH7785 (R8A77850ANBG) will be available in May at $60.74.
Renesas Technology , (408) 382-7407