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USB3320 Datasheet(PDF) 56 Page - Microchip Technology |
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USB3320 Datasheet(HTML) 56 Page - Microchip Technology |
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56 / 70 page  USB3320 DS00001792B-page 56 2014-2015 Microchip Technology Inc. 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. 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. |
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