USB3300 datasheet(19/55 Pages) SMSC

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Hi-Speed USB Host, Device or OTG PHY with ULPI Low Pin Interface

Datasheet

SMSC USB3300

Revision 1.08 (11-07-07)

DATASHEET

Chapter 6 Architecture Overview

The USB3300 architecture can be broken down into the following blocks shown in Figure 6.1,

"Simplified USB3300 Architecture" below.

6.1

ULPI Digital

The USB3300 uses the industry standard ULPI digital interface to facilitate communication between

the PHY and Link (device controller). The ULPI interface is designed to reduce the number of pins

required to connect a discrete USB PHY to an ASIC or digital controller. For example, a full UTMI+

Level 3 OTG interface requires 54 signals while a ULPI interface requires only 12 signals.

The ULPI interface is documented completely in the “UTMI+ Low Pin Interface (ULPI)

Specification” document (www.ulpi.org).

The following sections highlight the key operating modes

of the USB3300 digital interface.

Figure 6.1 Simplified USB3300 Architecture

ULPI Digital

OTG

Module

DATA[7:0]

Internal

Regulator &

POR

Bias

Gen.

CLKOUT

NXT

DIR

STP

VDD3.3

XTAL &

PLL

VBUS

VDD3.3

USB3300

RBIAS

HS XCVR

FS/LS

XCVR

Resistors

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