USB3450 Standard Microsystems Corporation, USB3450 Datasheet - Page 12

• Manufacturer Part Number: USB3450
• Description: Hi-speed USB HOST OR Device PHY WITH Utmi+interface
• Manufacturer: Standard Microsystems Corporation

Revision 0.1 (05-11-05)
PIN
12
13
14
15
16
17
18
19
20
21
LINESTATE[1]
LINESTATE[0]
XCVRSEL[1]
OPMODE[1]
OPMODE[0]
HOSTDISC
RXACTIVE
CLKOUT
VDD1.8
VDD3.3
NAME
Table 3.1 USB3450 Pin Definitions (continued)
DIRECTION,
Output,
Output
CMOS
Output
Output
Output
TYPE
Input
Input
Input
N/A
N/A
DATASHEET
ACTIVE
LEVEL
High
High
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
12
DESCRIPTION
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
Receive Active. Indicates that the receive state
machine has detected Start of Packet and is active.
Operational Mode. These signals select between
the various operational modes:
[1]
0
0
1
1
60MHz reference clock output. All UTMI+ signals are
driven synchronous to this clock.
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
0
1
1
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.
3.3V PHY Supply. Provides power for Hi-Speed
Transceiver, UTMI+ Digital, Digital I/O, and
Regulators.
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.
Hi-Speed USB Host or Device PHY With UTMI+ Interface
[0]
0
[0]
1
0
1
0
1
0
1
2: Disable bit stuffing and NRZI encoding
Description
Description
1: Non-driving (all terminations removed)
0: Normal Operation
3: Reserved
0: SEO
1: J State
2: K State
3: SE1
SMSC USB3450
Datasheet