USB3370 datasheet(58/75 Pages) MICROCHIP

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USB3370

DS00001915B-page 58

 2012 - 2015 Microchip Technology Inc.

7.1.2.4

Carkit Interrupt Latch

Address = 21h (read only with auto-clear)

Note 7-3

rd: Read Only with auto clear

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 Compensation Register

Address = 31h (read / write)

The USB3370 is designed to meet the USB specifications and requirements when the DP and DM signals are properly

designed on the PCB. The DP and DM trace impedance should be 45ohm single ended and 90ohm differential. In cases

where the DP and DM traces are not able to meet these requirements the HS Compensation register can be used to

compensate for the losses in signal amplitude.

Field Name

Bit

Access

Default

Description

IdFloat Latch

0rd (Note 7-

Asserted if the state of the ID pin changes from non-

floating to floating while the IdFloatRise bit is enabled

or if the state of the ID pin changes from floating to

non-floating while the IdFloatFall bit is enabled.

VdatDet Latch

1rd

If VdatDetIntEn is set and the VdatDet bit changes

state, this bit will be asserted.

CarDp Latch

Not Implemented. Reads as 0b.

RidConversionLatch

3rd

(Note 7-3)

If RidIntEn is set and the state of the

RidConversionDone

bit changes from a 0 to 1 this bit

will be asserted.

Reserved

7:4

0000b

Read only, 0.

Field Name

Bit

Access

Default

Description

VariSense

1:0

rd/w

00b

Used to lower the threshold of the squelch detector.

00: 100% (default)

01: 83%

10: 66.7%

11: 50%

Reserved

Read only, 0.

Reserved

Read only, 0.

PHYBoost

6:4

rd/w

000b

Used to change the output voltage of the Hi-Speed

transmitter

000: Nominal

001: +3.7%

010: +7.4%

011: +11.0%

100: +14.7%

101: +18.3%

110: +22.0%

111: +25.7%

Reserved

Read only, 0.

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