Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI Transceiver
Datasheet
FIELD NAME
BIT
ACCESS
DEFAULT DESCRIPTION
0b Automatically asserted by the USB3320 when the
RidConversionDone
3
rd
(Note 7.4)
Rid Conversion is finished. The conversion will take
282uS. This bit will auto clear when the RidValue is
read from the Rid Conversion Register. Reading the
RidValue from the Carkit Interrupt Status Register will
not clear either RidConversionDone status bit.
Note:
RidConversionDone can also be read from
the Carkit Interrupt Status Register.
RidConversionStart
4
rd/w/s/c
0b
When this bit is asserted either through a register
write or set, the Rid converter will read the value of
the ID resistor. When the conversion is complete this
bit will auto clear.
Reserved
RidIntEn
5
6
rd/w/s/c
rd/w/s/c
0b
0b
This bit must remain at 0.
When enabled an interrupt will be generated on the
alt_int of the RXCMD byte when RidConversionDone
bit is asserted.
Note:
This register bit is or’ed with the RidIntEn bit
of the Carkit Interrupt Status register.
Reserved
7
rd
0b
Read only, 0.
Note 7.4 rd: Read Only with auto clear.
7.1.3.4
USB IO & Power Management
Address = 39-3Bh (read), 39h (write), 3Ah (set), 3Bh (clear)
FIELD NAME
BIT
ACCESS
DEFAULT DESCRIPTION
Reserved
0
1
rd/w/s/c
rd/w/s/c
0b
0b
Read only, 0.
SwapDP/DM
When asserted, the DP and DM pins of the USB
transceiver are swapped. This bit can be used to
prevent crossing the DP/DM traces on the board. In
UART mode, it swaps the routing to the DP and DM
pins. In USB Audio Mode, it does not affect the
SPK_L and SPK_R pins.
UART RegOutput
3:2
rd/w/s/c
01b
Controls the output voltage of the VBAT to VDD33
regulator in UART mode. When the transceiver is
switched from USB mode to UART mode regulator
output will automatically change to the value
specified in this register when TxdEn is asserted.
00: 3.3V
01: 3.0V (default)
10: 2.75V
11: 2.5V
Note:
When in USB Audio Mode the regulator will
remain at 3.3V. When using this register it is
recommended that the Link exit UART
mode by using the RESETB pin.
ChargerPullupEnDP
4
rd/w/s/c
0b
Enables a Pull-up for USB Charger Detection when
set on the DP pin. (The pull-up is automatically
enabled in UART mode)
SMSC USB3320
Revision 1.0 (07-14-09)
DATA7S1HEET
SMSC [ SMSC CORPORATION ]
