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Transceiver supports newly released ULPI specification

Posted: 18 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:snsc? utmi+ low-pin interface? ulpi? usb3300? transceiver?

SMSC has announced its support of the newly released UTMI+ low-pin interface (ULPI) industry specification through its USB3300 ULPI standalone peripheral, embedded host or On-the-Go (OTG) transceiver.

The USB3300 is claimed to be the industry's first ULPI physical layer transceiver (PHY) to achieve Hi-Speed certification from the USB implementer's forum (USB-IF). It also passed the USB-IF's Hi-Speed OTG protocol (OPT) test with multiple controller IP cores, according to the company.

The ULPI specification reduces the pin count necessary to incorporate Hi-Speed USB in consumer electronics products. Compared with the legacy UTMI+ controller/PHY interface in Hi-Speed OTG applications, ULPI reduces the interface pin count from 32 to 12. As a result, designers can more easily combine standalone PHYs with ASICs, SoCs and FPGAs.

"As a promoter and one of the founding members of the ULPI Working Group, we are delivering breakthrough products for ASIC, SoC and FPGA designers considering the benefits of a standalone Hi-Speed USB PHY. As designs migrate towards the 90-nm technology node and beyond, we are seeing a dramatic shift towards utilizing a stand-alone PHY due to complex issues that exist when integrating a transceiver at these densities," said Steve Nelson, SMCS' VP of Marketing, Connectivity Solutions, in a statement. "These designers are now fully empowered to add Hi-Speed USB connectivity to their products while avoiding the risk and cost of trying to integrate 5-volt tolerant analog PHY circuitry."

The USB3300 features a ULPI-optimized design, which compresses the UTMI+ interfaces from 54 pins to 12 pins using a method of in-band signaling and status byte transfers between the Link and PHY. The USB3300 is designed with a ULPI interface, not with a UTMI-to-ULPI wrapper, providing a seamless ULPI to Link interface.

It also features internal 1.8V regulators, which allow operation from a single 3.3V supply; an integrated 24MHz crystal oscillator, which supports either crystal operation or 24MHz external clock input; and internal PLL for 480MHz Hi-Speed USB operation.

The USB3300 is available in a 5-by-5-by-0.9mm 32-pin QFN package. Qualification samples and production quantities of the SMSC USB3300 are available today. Pricing is $2 in 10,000-unit quantities.

- Ismini Scouras


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