USB3280 SMSC Corporation, USB3280 Datasheet - Page 9

• Manufacturer Part Number: USB3280
• Description: Hi-Speed USB Device PHY
• Manufacturer: SMSC Corporation

Hi-Speed USB Device PHY with UTMI Interface
Datasheet
Chapter 4 Interface Signal Definition
SMSC USB3280
LINESTATE[1:0]
TERMSELECT
XCVRSELECT
OPMODE[1:0]
SUSPENDN
CLKOUT
(SPDN)
RESET
(XSEL)
(TSEL)
NAME
(OM1)
(OM0)
(RST)
(CLK)
(LS1)
(LS0)
DIRECTION
Output
Output
Input
Input
Input
Input
Input
Table 4.1 System Interface Signals
Rising Edge
ACTIVE
LEVEL
High
Low
N/A
N/A
N/A
N/A
DATASHEET
9
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
Transceiver Select. This signal selects between the FS
and HS transceivers:
0: HS transceiver enabled
1: FS transceiver enabled.
Termination Select. This signal selects between the FS
and HS terminations:
0: HS termination enabled
1: FS termination enabled
Suspend. Places the transceiver in a mode that draws
minimal power from supplies. Shuts down all blocks not
necessary for Suspend/Resume operation. While
suspended, TERMSELECT must always be in FS mode
to ensure that the 1.5kΩ pull-up on DP remains powered.
0: Transceiver circuitry drawing suspend current
1: Transceiver circuitry drawing normal current
System Clock. This output is used for clocking receive
and transmit parallel data at 60MHz.
Operational Mode. These signals select between the
various operational modes:
[1]
0
0
1
1
Line State. These signals reflect the current state of the
USB data bus in FS mode, with [0] reflecting the state of
DP and [1] reflecting 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
[0]
[0]
0
1
0
1
0
1
0
1
Description
Description
0: Normal Operation
1: Non-driving (all terminations removed)
2: Disable bit stuffing and NRZI encoding
3: Reserved
0: SE0
1: J State
2: K State
3: SE1
DESCRIPTION
Revision 1.2 (10-27-06)