STULPI01ATBR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STULPI01ATBR

High speed USB On-The-Go ULPI transceiver

STMicroelectronics 

ULPI registers

STULPI01A - STULPI01B

Table 19.

OTG control register

0Ah-0Ch(Read), 0Ah(Write), 0Bh(Set), 0Ch(Clear)

(Controls UTMI + OTG functions of the PHY)

Field name

Bits Access Reset

Description

IdPullup

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

0

rd/wr/s/c

0b

signal level.

0b: Disables sampling of ID line.

1b: Enables sampling of ID line.

DpPulldown

Enables the 15kOhm pull-down resistor on DP.

1 rd/wr/s/c 1b 0b: Pull-down resistor not connected to DP.

1b: Pull-down resistor connected to DP.

DmPulldown

Enables the 15kOhm pull-down resistor on DM.

2 rd/wr/s/c 1b 0b: Pull-down resistor not connected to DM.

1b: Pull-down resistor connected to DM.

DischrgVbus

ChrgVbus

DrvVbus

DrvVbus External

UseExternal

VbusIndicator

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

3 rd/wr/s/c 0b to 1, and then resets this bit to 0 to stop the discharge.

0b: Do not discharge VBUS

1b: Discharge VBUS

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

4 rd/wr/s/c 0b 0b: Do not charge VBUS

1b: Charge VBUS

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

5

rd/wr/s/c

0b

on VBUS.

0b: Do not drive VBUS (default)

1b: Drive 5V on VBUS

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

6 rd/wr/s/c 0b 0b: Drive VBUS using the internal charge pump (default).

1b: Drive VBUS using external supply.

Tells STULPI01 to use an external VBUS over-current indicator.

7

rd/wr/s/c

0b

0b: Use the internal OTG comparator or internal

VBUS valid indicator (default)

1b: Use external VBUS valid indicator signal

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