Hi-Speed USB Transceiver with 1.8V ULPI Interface - 26MHz Reference Clock

SMSC USB3311

3

Revision 1.0 (05-08-07)

PRODUCT PREVIEW

General Description

The USB3311 is a highly integrated Hi-Speed USB2.0 Transceiver (PHY) that supports systems

architectures based on a 26MHz reference clock. It is designed to be used in both commercial and

industrial temperature applications.

The USB3311 meets all of the electrical requirements to be used as a Hi-Speed USB Host, Device, or

an On-the-Go (OTG) device. In addition to the supporting USB signaling the USB3311 also provides

USB UART mode and USB Audio mode.

USB3311 uses the industry standard UTMI+ Low Pin Interface (ULPI) to connect the USB PHY to the

Link. The industry standard ULPI interface uses a method of in-band signaling and status byte transfers

between the Link and PHY, to facilitate a USB session. By using in-band signaling and status byte

transfers the ULPI interface requires only 12 pins.

The USB3311 uses SMSC’s “wrapper-less” technology to implement the ULPI interface. This “wrapper-

less” technology allows the PHY to achieve a low latency transmit and receive time. SMSC’s low

latency transceiver allows an existing UTMI Link to be reused by adding a UTMI to ULPI bridge. By

adding a bridge to the ASIC the existing and proven UTMI Link IP can be reused.

The USB3311 is designed to run with a 26MHz reference clock. By using a reference clock from the

Link the USB3311 is able to remove the cost of a crystal reference from the design.

Figure 1 USB3311 Block Diagram

OTG

Carkit

Hi-Speed

USB

Transceiver

ULPI

Interface

ULPI

Registers

and State

Machine

BIAS

Low Jitter

Integrated

PLL

Integrated

Power

Management

VBUS

ID

DP

DM

RBIAS

REFCLK

DATA[7:0]

RESETB

VDD18

VDD33

VBAT

DIR

NXT

STP

CLKOUT