STULPI01A_12 datasheet(34/44 Pages) STMICROELECTRONICS

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ULPI registers

STULPI01A, STULPI01B

34/44

Doc ID 14817 Rev 4

Note:

0Ah-0Ch(Read), 0Ah(Write), 0Bh(Set), 0Ch(Clear). These addresses control UTMI + OTG

functions of the PHY.

Table 19.

OTG control register

Field name

Bits

Access

Reset

Description

IdPullup

0rd/wr/s/c

Connects a pull-up to the ID line and enables sampling of the

signal level.

0b: disables sampling of ID line.

1b: enables sampling of ID line.

DpPulldown

1rd/wr/s/c

Enables the 15 k

Ω pull-down resistor on DP.

0b: pull-down resistor not connected to DP.

1b: pull-down resistor connected to DP.

DmPulldown

2rd/wr/s/c

Enables the 15 k

Ω pull-down resistor on DM.

0b: pull-down resistor not connected to DM.

1b: pull-down resistor connected to DM.

DischrgVbus

3rd/wr/s/c

Discharges VBUS through a resistor. If the link sets this bit to 1,

it waits for an RX CMD indicating SessEnd has transition from 0

to 1, and then resets this bit to 0 to stop the discharge.

0b: does not discharge VBUS

1b: discharges VBUS

ChrgVbus

4rd/wr/s/c

Charges VBUS through a resistor. Used for VBUS pulsing SRP.

0b: does not charge VBUS

1b: charges VBUS

DrvVbus

5rd/wr/s/c

Signals the internal charge pump or external supply to drive 5 V

on VBUS.

0b: does not drive VBUS (default)

1b: drives 5 V on VBUS

DrvVbus External

6rd/wr/s/c

Selects between the internal and the external 5 V VBUS supply.

0b: drives VBUS using the internal charge pump (default).

1b: drives VBUS using external supply.

UseExternal

VbusIndicator

7rd/wr/s/c

Tells STULPI01 to use an external VBUS overcurrent indicator.

0b: uses the internal OTG comparator or internal

VBUS valid indicator (default)

1b: uses external VBUS valid indicator signal

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