USB3300 datasheet(20/55 Pages) SMSC

20 / 55 page

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

Datasheet

Revision 1.08 (11-07-07)

SMSC USB3300

DATASHEET

6.1.1

Overview

Figure 6.2 illustrates the block diagram of the ULPI digital functions. It should be noted that this PHY

does not use a “ULPI wrapper” around a UTMI+ PHY core as the ULPI specification implies.

The advantage of a “wrapper less” architecture is that the PHY has a lower USB latency than a design

which must first register signals into the PHY’s wrapper before the transfer to the PHY core. A low

latency PHY allows a Link to use a wrapper around a UTMI Link and still make the required USB turn-

around timing given in the USB 2.0 specification.

RxEndDelay maximum allowed by the UTMI+/ULPI for 8-bit data is 63 high speed clocks. USB3300

uses a low latency high speed receiver path to lower the RxEndDelay to 43 high speed clocks. This

low latency design gives the Link more cycles to make decisions and reduces the Link complexity. This

is the result of the “wrapper less” architecture of the USB3300. This low RxEndDelay should allow

legacy UTMI Links to use a “wrapper” to convert the UTMI+ interface to a ULPI interface.

Figure 6.2 ULPI Digital Block Diagram

Data[7:0]

Interrupt

Control

High Speed TX

Full Speed TX

Low Speed TX

High Speed Data

Recovery

Full / Low Speed

Data Recovery

ULPI Protocol

Block

6pinSerial Mode

XcvrSelect[1:0]

TermSelect

OpMode[1:0]

Reset

SuspendM

3pinSerial Mode

ClockSuspendM

AutoResume

Indicator Complement

Indicator Pass Thru

Interface Protect Disable

IdPullUp

DpPulldown

DmPulldown

DischrgVbus

ChrgVbus

DrvVbus

DrvVbusExternal

UseExternal Vbus Indicator

InterruptEnable Rise[4:0]

InterruptEnableFall[4:0]

InterruptStatus[4:0]

InterruptLatch[4:0]

Linestates[1:0]

VbusValid

SessionValid

SessionEnd

HS Tx Data

FS/LS Tx Data

HS RX Data

FS/LS Data

NOTE:

The USB3300 uses

a wrapperless ULPI

interface.

DIR

NXT

STP

Tx Data

Rx Data

POR

ULPI Register

Array

HostDisconnect

IdGnd

To OTG

Module

Transceiver

Control

Module

To USB

Transceiver

From OTG

Module

To USB

Transceiver

RXD CMD

From USB

Transceiver

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