TUSB8042AI datasheet(29/64 Pages) TI2

29 / 64 page

Table 8-7. Bit Descriptions – Device Configuration Register (continued)

Bit

Field

Type

Description

u1u2TimerOvr

U1 U2 Timer Override. When this field is set, the TUSB8042A

overrides the downstream ports U1/U2 timeout values set by USB 3.2

Host software. If software sets value in the range of 1h - FFh, the

TUSB8042A uses the value of FFh. If software sets value to 0, then

TUSB8042A uses value of 0. REG_09h [6] must be set to enable this

feature.

RSVD

Reserved. This field is reserved and returns 0 when read.

8.8 Battery Charging Support Register

Figure 8-7. Register Offset 6h

Bit No.

Reset State

Table 8-8. Bit Descriptions – Battery Charging Support Register

Bit

Field

Type

Description

7:4

RSVD

Reserved. Read only, returns 0 when read.

3:0

batEn[3:0]

Battery Charger Support. The bits in this field indicate whether the

downstream port implements the charging port features.

0 = The port is not enabled for battery charging support features

1 = The port is enabled for battery charging support features

Each bit corresponds directly to a downstream port, that is batEn0

corresponds to downstream port 1 and batEN1 corresponds to

downstream port 2.

The default value for these bits are loaded at the deassertion of reset

with the value of PWRCTL/BATEN[3:0].

When in I2C/SMBus mode the bits in this field can be overwritten by

EEPROM contents or by an SMBus host.

8.9 Device Removable Configuration Register

Figure 8-8. Register Offset 7h

Bit No.

Reset State

Table 8-9. Bit Descriptions – Device Removable Configuration Register

Bit

Field

Type

Description

customRmbl

Custom Removable. This bit controls selection of port removable bits,

port used bits, and USB2_ONLY bits.

0 = rmbl[3:0], used[3:0], and USB2_ONLY[3:0] are read only and the

values are loaded from the OTP ROM

1 = rmbl[3:0], used[3:0], and USB2_ONLY[3:0] are read/write and can

be loaded by EEPROM or written by SMBus

This bit can be written simultaneously with rmbl[3:0].

6:4

RSVD

Reserved. Read only, returns 0 when read.

3:0

rmbl[3:0]

RO/RW

Removable. The bits in this field indicate whether a device attached to

downstream ports 4 through 1 are removable or permanently attached.

0 = The device attached to the port is not removable

1 = The device attached to the port is removable

Each bit corresponds directly to a downstream port n + 1, that is rmbl0

corresponds to downstream port 1, rmbl1 corresponds to downstream

port 2, and so forth.

This field is read only unless the customRmbl bit is set to 1. Otherwise

the value of this filed reflects the inverted values of the OTP ROM

non_rmb[3:0] field.

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TUSB8042A

SLLSF93A – JUNE 2019 – REVISED JANUARY 2025

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