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Microprocessors integrate Ethernet controller, USB connectivity

Posted: 27 Mar 2007 ?? ?Print Version ?Bookmark and Share

Keywords:microprocessor? Ethernet? USB 2.0? Renesas? SuperH?

SH7670 microprocessors from Renesas

Renesas Technology Corp. has released the SH7670 group of 32bit RISC SuperH microprocessors. Each of the eight devices in this line incorporates an Ethernet controller and USB 2.0 host on a single chip, said to be the first to offer such feature. The SH7670 product line was designed to meet the growing demand for products capable of sharing content through both Ethernet and USB, particularly in a home network.

480MIPS at 200MHz
The SH2A-FPU 32bit CPU core used in the SH7670 achieves a processing performance of 480MIPS when running at the maximum operating frequency of 200MHz. The on-chip Ethernet controller implements an IEEE802.3-compliant MAC layer. As the SH7670 devices incorporate Ethernet controller and USB 2.0 host and function module capabilities on a single chip, there is no need for a dedicated external LAN controller and USB 2.0 LSIs.

Furthermore, a host interface function is included that allows easy connection to a main microprocessor for system control. This function comprises a 16bit bus and two SRAM banks, each with 2Kbytes linear address space (4Kbytes total), providing for direct reading and writing from the main microprocessor by access to this SRAM via the 16bit bus. This assures high-speed transfer to the main processor of data downloaded via an Ethernet or USB connection.

The host interface function enables customers to shorten system development time because the product's main functions and its network connection functions can be developed in parallel. In addition, the SH7670 group makes it relatively easy to add Ethernet connectivity and advanced functionality to an existing system.

The host interface also includes an HIF boot mode. This makes it possible to download software from flash memory connected to the main MCU to SDRAM connected to the SH7670 via the host interface. The SH7670 can thus be used for software storage, eliminating the need for external flash memory and reducing the overall number of devices.

Higher network throughput
The SH7670 also includes a general-purpose DMA controller, enabling high-speed data transfers between separate banks of external memory. This contributes to higher overall network data throughput.

In addition to the above, audio (voice) codec middleware enables decoding of audio data in formats such as AAC that has been downloaded from a home network server or USB memory. This way, processing usually performed by a dedicated LSI such as a DSP can be accomplished using a software.

An on-chip debugging function is included that enables real-time debugging at the maximum operating frequency. A compact PC card size emulator, the E10A-USB, is available.

The package is a compact 256-pin BGA (17-by-17mm) that helps minimize product size. Sample shipments will begin April 2007 in Japan. Sample pricing ranges from $18.22 to $19.92 each.




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