Hi-Speed USB Host or Device PHY With UTMI+ Interface

Datasheet

SMSC USB3450

7

Revision 0.1 (05-11-05)

DATASHEET

Chapter 1 General Description

The USB3450 is a stand-alone Hi-Speed USB Physical Layer Transceiver (PHY). The USB3450 uses

a UTMI+ interface to connect to an SOC or ASIC or FPGA. SMSC’s advanced proprietary technology

minimizes power dissipation, resulting in maximum battery life for portable applications. The USB3450

is a flexible solution for adding USB to new designs without integrating the analog PHY block.

The USB3450 provides a fully compliant Hi-Speed interface, and supports Hi-Speed (HS), Full-Speed

(FS), and Low-Speed (LS) USB. The USB3450 supports all levels of the UTMI+ specification as shown

in Figure 1.2.

Figure 1.1 Basic UTMI+ USB Device Block Diagram

Figure 1.2 UTMI+ Level 3 Support

SOC/FPGA/ASIC

Including Device Controller

USB3450

Hi-

Speed

Analog

USB

Connector

(Standard

or Mini)

DM

V

BUS

DP

ID

Hi-Speed

USB App.

UTMI+

Interface

UTMI+

Digital

Logic

UTMI+

Link

UTMI+ Level 0

Hi-Speed Peripherals Only

USB3450

USB3500

UTMI+ Level 3

Hi-Speed Peripheral, host controllers, On-

the-Go devices

(HS, FS, LS, preamble packet)

UTMI+ Level 2

Hi-Speed Peripheral, host controllers, On-

the-Go devices

(HS, FS, and LS but no preamble packet)

UTMI+ Level 1

Hi-Speed Peripheral, host controllers,

and On-the-Go devices

(HS and FS Only)

USB3280

USB3250