USB3300_06 datasheet(11/49 Pages) SMSC

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

Datasheet

SMSC USB3300

Revision 1.06 (07-19-06)

DATASHEET

VBUS

I/O,

Analog

N/A

VBUS pin of the USB cable. The USB3300 uses this

pin for the Vbus comparator inputs and for Vbus

pulsing during session request protocol.

Input,

Analog

N/A

ID pin of the USB cable. For non-OTG applications

this pin can be floated. For an A-Device ID = 0. For

a B-Device ID = 1.

VDD3.3

Power

N/A

3.3V Supply. A 0.1uF bypass capacitor should be

connected between this pin and the ground plane on

the PCB.

I/O,

Analog

N/A

D+ pin of the USB cable.

I/O,

Analog

N/A

D- pin of the USB cable.

RESET

Input, CMOS

High

Optional active high transceiver reset. This is the

same as a write to the ULPI Reset, address 04h, bit

5. This does not reset the ULPI register set. This

signal must be de-asserted synchronous to

CLKOUT. This pin includes an integrated pull-down

resistor to ground. If not used this pin can be floated

or connected to ground (recommended).

EXTVBUS

Input, CMOS

High

External Vbus Detect. Connect to fault output of an

external USB power switch or an external Vbus Valid

comparator. See Section 6.5.4, "External Vbus

Indicator," on page 44 for details. This pin has a pull

down resistor to prevent it from floating when the

ULPI bit UseExternalVbusIndicator is set to 0.

NXT

Output,

CMOS

High

The PHY asserts NXT to throttle the data. When the

Link is sending data to the PHY, NXT indicates when

the current byte has been accepted by the PHY. The

Link places the next byte on the data bus in the

following clock cycle.

DIR

Output,

CMOS

N/A

Controls the direction of the data bus. When the

PHY has data to transfer to the Link, it drives DIR

high to take ownership of the bus. When the PHY

has no data to transfer it drives DIR low and

monitors the bus for commands from the Link. The

PHY will pull DIR high whenever the interface cannot

accept data from the Link, such as during PLL start-

up.

STP

Input,

CMOS

High

The Link asserts STP for one clock cycle to stop the

data stream currently on the bus. If the Link is

sending data to the PHY, STP indicates the last byte

of data was on the bus in the previous cycle. The

STP pin also includes the interface protection

detailed in Section 6.1.9.3, "Interface Protection," on

page 36.

CLKOUT

Output,

CMOS

N/A

60MHz reference clock output. All ULPI signals are

driven synchronous to the rising edge of this clock.

VDD1.8

Power

N/A

1.8V regulator output for digital circuitry on chip.

Place a 0.1uF capacitor near this pin and connect

the capacitor from this pin to ground. Connect pin 15

to pin 26.

VDD3.3

Power

N/A

A 0.1uF bypass capacitor should be connected

between this pin and the ground plane on the PCB.

Table 3.1 USB3300 Pin Definitions 32-Pin QFN Package (continued)

NAME

DIRECTION,

TYPE

ACTIVE

LEVEL

DESCRIPTION

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