TUSB1146 datasheet(41/68 Pages) TI2

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TUSB1146

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8.6.1.5 DisplayPort_1 Register (Offset = 0x12) [reset = 0x0]

DisplayPort_1 is shown in Table 17.

Return to the Summary Table.

This register provides status of AUX snooping when AUX Snooping is enabled.

Table 17. DisplayPort_1 Register Field Descriptions

Bit

Field

Type

Reset

Description

RESERVED

0x0

Reserved

6-5

SET_POWER_STATE

0x0

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

0x0

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 will

be 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.

8.6.1.6 DisplayPort_2 Register (Offset = 0x13) [reset = 0x0]

DisplayPort_2 is shown in Table 18.

Return to the Summary Table.

This register provides controls for enabling and disabling AUX snooping and individual DP lanes.

Table 18. DisplayPort_2 Register Field Descriptions

Bit

Field

Type

Reset

Description

AUX_SNOOP_DISABLE

R/W

0x0

Controls whether DP lanes are enabled based on AUX snooped

value or registers.

0x0 = AUX snoop enabled.

0x1 = AUX snoop disabled. DP lanes are controlled by

registers.

RESERVED

0x0

Reserved

5-4

AUX_SBU_OVR

R/W

0x0

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

based on CTL1 and FLIP. Changing this field to 01b or 10b will allow

traffic to pass through AUX to SBU regardless of the state of

CTLSEL1 and FLIPSEL register.

0x0 = AUX to SBU connection determined by CTLSEL1 and

FLIPSEL

0x1 = AUXP -> SBU1 and AUXN -> SBU2

0x2 = AUXP -> SBU2 and AUXN -> SBU1

0x3 = AUX to SBU open.

DP3_DISABLE

R/W

0x0

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 will have no effect on lane 3 functionality.

0x0 = DP Lane 3 enabled.

0x1 = DP Lane 3 disabled.

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