USB3450 datasheet(12/40 Pages) SMSC

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

Datasheet

Revision 0.1 (05-11-05)

SMSC USB3450

DATASHEET

XCVRSEL[1]

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

RXACTIVE

Output

High

Receive Active. Indicates that the receive state

machine has detected Start of Packet and is active.

OPMODE[1]

Input

N/A

Operational Mode. These signals select between

the various operational modes:

[1]

[0]

Description

0: Normal Operation

1: Non-driving (all terminations removed)

2: Disable bit stuffing and NRZI encoding

3: Reserved

OPMODE[0]

Input

N/A

CLKOUT

Output,

CMOS

N/A

60MHz reference clock output. All UTMI+ signals are

driven synchronous to this clock.

LINESTATE[1]

Output

N/A

Line State. These signals reflect the current state of

the USB data bus in FS mode. Bit [0] reflects the

state of DP and bit [1] reflects the state of DM. When

the device is suspended or resuming from a

suspended state, the signals are combinatorial.

Otherwise, the signals are synchronized to CLKOUT.

[1]

[0]

Description

0: SEO

1: J State

2: K State

3: SE1

LINESTATE[0]

Output

N/A

VDD1.8

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 19

to pin 34.

VDD3.3

N/A

3.3V PHY Supply. Provides power for Hi-Speed

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

Regulators.

HOSTDISC

Output

High

Host Disconnect. Indicates that a downstream

device has been disconnected from this host PHY

when operating in HS host mode. Automatically

reset to 0b when Low Power Mode is entered.

Table 3.1 USB3450 Pin Definitions (continued)

NAME

DIRECTION,

TYPE

ACTIVE

LEVEL

DESCRIPTION

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