USB3320 datasheet(56/70 Pages) MICROCHIP

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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

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

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

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-

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

rd/w/s/c

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

rd/w/s/c

This bit must remain at 0.

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