參數(shù)資料
型號(hào)： USB3450-FZG
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 微控制器/微處理器
英文描述： HI-SPEED USB HOST OR DEVICE PHY WITH UTMI+INTERFACE
中文描述： SERIAL COMM CONTROLLER, QCC40
封裝： 6 X 6 MM, 0.90 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, MO-220, QFN-40
文件頁(yè)數(shù)： 27/40頁(yè)
文件大?。?/td> 1086K
代理商： USB3450-FZG
Hi-Speed USB Host or Device PHY With UTMI+ Interface
Datasheet
Chapter 7 Application Notes
SMSC USB3450
27
Revision 0.1 (05-11-05)
DATASHEET
The following sections consist of select functional explanations to aid in implementing the USB3450
into a system. For complete description and specifications consult the
Hi-Speed Transceiver Macrocell
Interface Specification
and
Universal Serial Bus Specification Revision 2.0.
7.1
Linestate
The voltage thresholds that the LINESTATE[1:0] signals use to reflect the state of DP and DM depend
on the state of XCVRSELECT. LINESTATE[1:0] uses HS thresholds when the HS transceiver is
enabled (XCVRSELECT = 0) and FS thresholds when the FS transceiver is enabled (XCVRSELECT
= 1). There is not a concept of variable single-ended thresholds in the Hi-Speed specification for HS
mode.
The HS receiver is used to detect Chirp J or K, where the output of the HS receiver is always qualified
with the Squelch signal. If squelched, the output of the HS receiver is ignored. In the USB3450, as an
alternative to using variable thresholds for the single-ended receivers, the following approach is used.
In HS mode, 3ms of no USB activity (IDLE state) signals a reset. The Link monitors LINESTATE[1:0]
for the IDLE state. To minimize transitions on LINESTATE[1:0] while in HS mode, the presence of
Squelch
is used to force LINESTATE[1:0] to a J state.
7.2
OPMODES
The OPMODE[1:0] pins allow control of the operating modes.
Table 7.1 Linestate States
STATE OF DP/DM LINES
LINESTATE[1:0]
FULL SPEED
XCVRSELECT =1
TERMSELECT=1
HIGH SPEED
XCVRSELECT =0
TERMSELECT=0
CHIRP MODE
XCVRSELECT =0
TERMSELECT=1
LS[1]
LS[0]
0
0
SE0
Squelch
Squelch
0
1
J
Squelch
Squelch
&
HS Diff. Receiver Output
1
0
K
Invalid
Squelch
&
HS Diff. Receiver Output
1
1
SE1
Invalid
Invalid
Table 7.2 Operational Modes
MODE[1:0]
STATE#
STATE NAME
DESCRIPTION
00
0
Normal Operation
Transceiver operates with normal USB data encoding and
decoding
01
1
Non-Driving
Allows the transceiver logic to support a soft disconnect feature
which tri-states both the HS and FS transmitters, and removes
any termination from the USB making it appear to an upstream
port that the device has been disconnected from the bus
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