Datasheet

Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI Transceiver
Datasheet
Revision 1.0 (07-14-09) 60 SMSC USB3320
DATASHEET
The ULPI interface is redefined as shown in Table 6.10 when Headset Audio Mode is entered.
Exiting Headset Audio Mode is the same as exiting Low Power Mode as described in Section 6.3.2.
The Link must assert STP to signal the PHY to exit. When the PHY can accept a command, DIR is
de-asserted and the PHY will wait until the Link de-asserts STP to resume synchronous ULPI
operation. The RESETB pin can also be pulsed low to reset the USB3320 and return it to Synchronous
Mode.
Table 6.10 Pin Definitions in Headset Audio Mode
SIGNAL
CONNECTED
TO DIRECTION DESCRIPTION
SessVld DATA[0] OUT Output of SessVld comparator
VbusVld DATA[1] OUT Output of VbusVld Comparator (interrupt must be enabled)
IdGndDrv DATA[2] IN Drives ID pin to ground when asserted
0b: Not connected
1b: Connects ID to ground.
DATA[3] OUT Driven low
IdGround DATA[4] OUT Asserted when the ID pin is grounded.
0b: ID pin is grounded
1b: ID pin is floating
IdFloat DATA[5] OUT Asserted when the ID pin is floating. IdPullup or
d_pullup330 must be enabled as shown below.
IdPullup330 DATA[6] IN When enabled a 330kΩpullup is applied to the ID pin. This
bit will also change the trip point of the IdGnd comparator
to the value shown in Ta b le 4 . 7.
0b: Disables the pull-up resistor
1b: Enables the pull-up resistor
IdPullup DATA[7] IN Connects the 100kΩ pull-up resistor from the ID pin to
VDD3.3
0b: Disables the pull-up resistor
1b: Enables the pull-up resistor