TUSB1044AI datasheet(42/66 Pages) TI1

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Table 8-8. DisplayPort_1 Register Field Descriptions

Bit

Field

Type

Reset

Description

RESERVED

Reserved

6-5

SET_POWER_STATE

This field represents the snooped value of the AUX write to

DPCD address 0x00600. When AUX_SNOOP_DISABLE = 0b, the

enable/disable of DP lanes based on the snooped value. When

AUX_SNOOP_DISABLE = 1b, then DP lane enable/disable are

determined by state of DPx_DISABLE registers, where x = 0, 1, 2, or

3. This field is reset to 0h by hardware when CTLSEL1 changes from

a 1b to a 0b.

4-0

LANE_COUNT_SET

This field represents the snooped value of AUX write to DPCD

address 0x00101 register. When AUX_SNOOP_DISABLE = 0b, DP

lanes enabled specified by the snoop value. Unused DP lanes are

disabled to save power. When AUX_SNOOP_DISABLE = 1b, then

DP lanes enable/disable are determined by DPx_DISABLE registers,

where x = 0, 1, 2, or 3. This field is reset to 0h by hardware when

CTLSEL1 changes from a 1b to a 0b.

8.1.7 DisplayPort_2 Register (Offset = 13h) [Reset = 00h]

DisplayPort_2 is shown in Table 8-9.

Return to the Summary Table.

Table 8-9. DisplayPort_2 Register Field Descriptions

Bit

Field

Type

Reset

Description

AUX_SNOOP_DISABLE

R/W

Controls whether the DP lanes are enabled based on AUX snooped

value or registers.

0h = AUX snoop enabled.

1h = AUX snoop disabled. DP lanes are controlled by registers.

RESERVED

Reserved

5-4

AUX_SBU_OVR

R/W

This field overrides the AUXP/N to SBU1/2 connect and disconnect

based on CTL1 and FLIP. Change this field to 1b to allow traffic to

pass through AUX to SBU regardless of the state of CTLSEL1 and

FLIPSEL register.

0h = AUX to SBU connection determined by CTLSEL1 and FLIPSEL

1h = AUXP -> SBU1 and AUXN -> SBU2

2h = AUXP -> SBU2 and AUXN -> SBU1

3h = AUX to SBU open.

DP3_DISABLE

R/W

When AUX_SNOOP_DISABLE = 1b, this field can be used to enable

or disable DP lane 3. When AUX_SNOOP_DISABLE = 0b, changes

to this field have no effect on lane 3 functionality.

0h = DP Lane 3 enabled.

1h = DP Lane 3 disabled.

DP2_DISABLE

R/W

When AUX_SNOOP_DISABLE = 1b, this field can be used to enable

or disable DP lane 2. When AUX_SNOOP_DISABLE = 0b, changes

to this field have no effect on lane 2 functionality.

0h = DP Lane 2 enabled.

1h = DP Lane 2 disabled.

DP1_DISABLE

R/W

When AUX_SNOOP_DISABLE = 1b, this field can be used to enable

or disable DP lane 1. When AUX_SNOOP_DISABLE = 0b, changes

to this field have no effect on lane 1 functionality.

0h = DP Lane 1 enabled.

1h = DP Lane 1 disabled.

TUSB1044A

SLLSG07 – MARCH 2025

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