USB3500 datasheet(13/46 Pages) SMSC

13 / 46 page

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

Datasheet

SMSC USB3500

Revision 1.0 (04-04-05)

DATASHEET

VDD3.3

N/A

3.3V PHY Supply. Provides power for USB2.0

Transceiver, UTMI+ Digital, Digital I/O, and

Regulators.

HOSTDISC

Output

High

Host Disconnect. In HS Host mode this indicates to

that a downstream device has been disconnected.

Automatically reset to 0b when Low Power Mode is

entered.

DISCHRGVBUS

Input

High

Discharge VBUS through a resistor to ground.

0: do not discharge VBUS

1: discharge VBUS

SESSEND

Output

High

Session End. Indicates that the voltage on Vbus is

below its B-Device Session End threshold.

0: VBUS > VSessEnd

1: VBUS < VSessEnd

DATA[7]

I/O,

CMOS,

Pull-low

N/A

8-bit bi-directional data bus. Data[7] is the MSB and

Data[0] is the LSB.

DATA[6]

I/O,

CMOS,

Pull-low

N/A

DATA[5]

I/O,

CMOS,

Pull-low

N/A

DATA[4]

I/O,

CMOS,

Pull-low

N/A

DATA[3]

I/O,

CMOS,

Pull-low

N/A

DATA[2]

I/O,

CMOS,

Pull-low

N/A

DATA[1]

I/O,

CMOS,

Pull-low

N/A

DATA[0]

I/O,

CMOS,

Pull-low

N/A

VSS

Ground

N/A

PHY ground.

RXVALID

Output

High

Receive Data Valid. Indicates that the DATA bus has

received valid data. The Receive Data Holding

is expected to register the DATA bus on the next

rising edge of CLKOUT.

SESSVLD

Output

High

Session Valid. Indicates that the voltage on Vbus is

above the indicated threshold.

0: VBUS < VSessVld

1: VBUS > VSessVld

Table 3.1 USB3500 Pin Definitions (continued)

NAME

DIRECTION,

TYPE

ACTIVE

LEVEL

DESCRIPTION

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