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USB3300-EZK

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

SMSC -> Microchip 

6.1.1

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

Datasheet

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.

Data[7:0]

DIR

NXT

Tx Data

ULPI Protocol

Block

STP

Rx Data

High Speed TX

Full Speed TX

Low Speed TX

HS Tx Data

FS/LS Tx Data

High Speed Data

Recovery

Full / Low Speed

Data Recovery

HS RX Data

FS/LS Data

RXD CMD

InterruptStatus[4:0]

InterruptLatch[4:0]

InterruptEnable Rise[4:0]

InterruptEnableFall[4:0]

Interrupt

Control

XcvrSelect[1:0]

TermSelect

OpMode[1:0]

Reset

To USB

Transceiver

VbusValid

SessionValid

SessionEnd

IdGnd

Linestates[1:0]

HostDisconnect

From OTG

Module

From USB

Transceiver

ULPI Register

Array

SuspendM

6pinSerial Mode

3pinSerial Mode

ClockSuspendM

AutoResume

Transceiver

Control

Module

To USB

Transceiver

Interface Protect Disable

Indicator Complement

Indicator Pass Thru

IdPullUp

DpPulldown

DmPulldown

To OTG

DischrgVbus

Module

POR

ChrgVbus

NOTE:

DrvVbus

The USB3300 uses

DrvVbusExternal

UseExternal Vbus Indicator

a wrapperless ULPI

interface.

Revision 1.08 (11-07-07)

Figure 6.2 ULPI Digital Block Diagram

20

DATASHEET

SMSC USB3300

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