TUSB1046AI-DCI datasheet(16/48 Pages) TI2

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TUSB1046A-DCI

SLLSF13B – JUNE 2017 – REVISED MAY 2019

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8.3 Feature Description

8.3.1 USB 3.1

The TUSB1046A-DCI supports USB 3.1 Gen1/Gen2 datarates up to 10 Gbps. The TUSB1046A-DCI supports all

the USB defined power states (U0, U1, U2, and U3). Because the TUSB1046A-DCI is a linear redriver, it can’t

decode USB3.1 physical layer traffic. The TUSB1046A-DCI monitors the actual physical layer conditions like

receiver termination, electrical idle, LFPS, and SuperSpeed signaling rate to determine the USB power state of

the USB 3.1 interface.

The TUSB1046A-DCI features an intelligent low frequency periodic signaling (LFPS) detector. The LFPS

detector automatically senses the low frequency signals and disables receiver equalization functionality. When

not receiving LFPS, the TUSB1046A-DCI will enable receiver equalization based on the EQ[1:0] and SSEQ[1:0]

pins or values programmed into EQ1_SEL, EQ2_SEL, and SSEQ_SEL registers.

8.3.2 DisplayPort

The TUSB1046A-DCI supports up to 4 DisplayPort lanes at datarates up to 8.1Gbps (HBR3). The TUSB1046A-

DCI, when configured in DisplayPort mode, monitors the native AUX traffic as it traverses between DisplayPort

source and DisplayPort sink. For the purposes of reducing power, the TUSB1046A-DCI manages the number of

active DisplayPort lanes based on the content of the AUX transactions. The TUSB1046A-DCI snoops native AUX

writes

DisplayPort

sink’s

DPCD

registers

0x00101

(LANE_COUNT_SET)

and

0x00600

(SET_POWER_STATE).

TUSB1046A-DCI

disables/enables

lanes

based

value

written

LANE_COUNT_SET. The TUSB1046A-DCI disables all lanes when SET_POWER_STATE is in the D3.

Otherwise active lanes will be based on value of LANE_COUNT_SET.

DisplayPort AUX snooping is enabled by default but can be disabled by changing the AUX_SNOOP_DISABLE

various configuration registers. When TUSB1046A-DCI is enabled for GPIO mode (I2C_EN = "0"), the CAD_SNK

pin can be used to disable AUX snooping. When CAD_SNK pin is high, the AUX snooping functionality is

disabled and all four DisplayPort lanes will be active.

8.3.3 4-level Inputs

The TUSB1046A-DCI has (I2C_EN, EQ[1:0], DPEQ[1:0], and SSEQ[1:0]) 4-level inputs pins that are used to

control the equalization gain and place TUSB1046A-DCI into different modes of operation. These 4-level inputs

utilize a resistor divider to help set the 4 valid levels and provide a wider range of control settings. There is an

internal 30 k

Ω pull-up and a 94 kΩ pull-down. These resistors, together with the external resistor connection

combine to achieve the desired voltage level.

Table 1. 4-Level Control Pin Settings

LEVEL

SETTINGS

Option 1: Tie 1 K

Ω 5% to GND.

Option 2: Tie directly to GND.

Tie 20 K

Ω 5% to GND.

Float (leave pin open)

Option 1: Tie 1 K

Ω 5%to VCC.

Option 2: Tie directly to VCC.

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