Datasheet

Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI Transceiver

Datasheet

SMSC USB3320 71 Revision 1.0 (07-14-09)

DATASHEET

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)

RidConversionDone 3rd

(Note 7.4)

0b Automatically asserted by the USB3320 when the

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 5 rd/w/s/c 0b This bit must remain at 0.

RidIntEn 6 rd/w/s/c 0b 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.

FIELD NAME BIT ACCESS DEFAULT DESCRIPTION

Reserved 0 rd/w/s/c 0b Read only, 0.

SwapDP/DM 1 rd/w/s/c 0b 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