Datasheet

Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI Transceiver
Datasheet
Revision 1.0 (07-14-09) 70 SMSC USB3320
DATASHEET
7.1.3 Vendor Register Access
The vendor specific registers include the range from 30h to 3Fh. These can be accessed by the ULPI
immediate register read / write.
7.1.3.1 HS TX Boost
Address = 31h (read / write)
7.1.3.2 Headset Audio Mode
Address = 33h (read / write)
7.1.3.3 Vendor Rid Conversion
Address = 36-38h (read), 36h (write), 37h (set), 38h (clear)
FIELD NAME BIT ACCESS DEFAULT DESCRIPTION
Reserved 4:0 rd 00000b Read only, 0.
Boost 6:5 rd/w 00b Sets the HS transmitter amplitude as described in
Section 5.2.1.
00b: Nominal
01b: Enables 11.1% increased drive strength
10b: Enables 7.4% increased drive strength
11b: Enables 3.7% increased drive strength
Reserved 7 rd 0b Read only, 0.
FIELD NAME BIT ACCESS DEFAULT DESCRIPTION
HeadsetAudioEn 3:0 rd/w 0000b When this field is set to a value of 1010, the Headset
Audio Mode is enabled as described in Section 6.7.
Reserved 7:4 rd 0h Read only, 0.
FIELD NAME BIT ACCESS DEFAULT DESCRIPTION
RidValue 2:0 rd/w 000b Conversion value of Rid resistor
000: 0 ohms
001: 75 ohms
010: 100K ohms
011: 200K ohms
100: 440K ohms
101: ID floating
111: Error
Note: RidValue can also be read from the Carkit
Interrupt Status Register.