USB3450 datasheet(11/40 Pages) SMSC

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

Datasheet

SMSC USB3450

Revision 0.1 (05-11-05)

DATASHEET

3.2

Pin Definitions

Table 3.1 USB3450 Pin Definitions

NAME

DIRECTION,

TYPE

ACTIVE

LEVEL

DESCRIPTION

XCVRSEL[0]

Input

N/A

Transceiver Select. These signals select between

the FS and HS transceivers:

Transceiver select.

00: HS

01: FS

10: LS

11: LS data, FS rise/fall times

TERMSEL

Input

N/A

Termination Select. This signal selects between the

FS and HS terminations:

0: HS termination enabled

1: FS termination enabled

TXREADY

Output

High

Transmit Data Ready. If TXVALID is asserted, the

Link must always have data available for clocking

into the TX Holding Register on the rising edge of

CLKOUT. TXREADY is an acknowledgement to the

Link that the transceiver has clocked the data from

the bus and is ready for the next transfer on the bus.

If TXVALID is negated, TXREADY can be ignored by

the Link.

SUSPENDN

Input

Low

Suspend. Places the transceiver in a mode that

draws minimal power from supplies. In host mode,

RPU is removed during suspend. In device mode,

RPD is controlled by TERMSEL. In suspend mode

the clocks are off.

0: PHY in suspend mode

1: PHY in normal operation

TXVALID

Input

High

Transmit Valid. Indicates that the DATA bus is valid

for transmit. The assertion of TXVALID initiates the

transmission of SYNC on the USB bus. The

negation of TXVALID initiates EOP on the USB.

Control inputs (OPMODE[1:0],

TERMSEL,XCVERSEL) must not be changed on the

de-assertion or assertion of TXVALID.

RESET

Input

High

Reset. Reset all state machines. After coming out

of reset, must wait 5 rising edges of clock before

asserting TXValid for transmit.

Assertion of Reset: May be asynchronous to

CLKOUT

De-assertion of Reset: Must be synchronous to

CLKOUT

VDD3.3

N/A

3.3V PHY Supply. Provides power for Hi-Speed

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

Regulators.

I/O,

Analog

N/A

D+ pin of the USB cable.

I/O,

Analog

N/A

D- pin of the USB cable.

N/A

No Connect.

VDD3.3

N/A

3.3V PHY Supply.

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