TUSB1046-DCIRNQT

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1. Describe

TUSB1046-DCIRNQT is a VESA USB Type-C™ Alt Mode redrive switch for USB 3.1 data rate support Up to 10 Gbps and DisplayPort 1.4 up to 8.1 Gbps Downstream-facing port (host). The device is used for VESA Configurations C, D, E, and F DisplayPort Alt Mode on USB Type-C Standard Version 1.1. This protocol-independent linear redriver is Also able to support other USB Type-C Alts Mode interface. TUSB1046-DCI provides multiple levels of Receive linear equalization to compensate for cable and board trace losses due to intersymbol interference (ISI). The device operates from a single 3.3 V supply and within the commercial temperature range Industrial temperature range.

2. Feature

    1. USB Type-C crosspoint switch support

        – USB 3.1 SSP + 2 DisplayPort channels

        – 4 DisplayPort channels

    2. USB 3.1 Gen 1/Gen 2 up to 10 Gbps

    3. DisplayPort 1.4 up to 8.1 Gbps (HBR3)

    4. VESA® DisplayPort Alt Mode DFP re-drive crosspoint switch supporting C, D, E and F configurations

    5. Ultra-low power architecture

    6. Linear redrivers with up to 14 dB equalization

    7. Transparent to DisplayPort link training

    8. Automatic LFPS de-emphasis control to meet USB 3.1 certification requirements

    9. Configuration via GPIO or I2C

  10. Support hot swap

  11. Industrial temperature range: -40ºC to 85ºC (TUSB1046I-DCI)

  12. Commercial temperature range: 0ºC to 70ºC (TUSB1046-DCI)

  13. 4mm x 6mm, 0.4mm pitch WQFN package

3. Pin configuration

4. Application

    1. tablet

    2. Notebook

    3. Desktop

    4. Docking station

5. Feature Description

    1. USB 3.1

        The TUSB1046-DCIRNQT supports USB 3.1 Gen1/Gen2 datarates up to 10 Gbps. The TUSB1046-DCIRNQT supports all the USB defined power states (U0, U1, U2, and U3). Because the TUSB1046-DCI is a linear redriver, it can 't decode USB3.1 physical layer traffic. The TUSB1046-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 TUSB1046-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 TUSB1046-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.

    2. DisplayPort

        The TUSB1046-DCIRNQT supports up to 4 DisplayPort lanes at datarates up to 8.1Gbps (HBR3). The TUSB1046-DCIRNQT, 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 TUSB1046-DCI manages the number of active DisplayPort lanes based on the content of the AUX transactions. The TUSB1046-DCI snoops native AUX writes to DisplayPort sink’s DPCD registers 0x00101 (LANE_COUNT_SET) and 0x00600 (SET_POWER_STATE). TUSB1046-DCI disables/enables lanes based on value written to LANE_COUNT_SET. The TUSB1046-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 register. Once AUX snoop is disabled, management of TUSB1046-DCI DisplayPort lanes are controlled through various configuration registers. When TUSB1046-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.

    3. Receiver Linear Equalization

        The purpose of receiver equalization is to compensate for channel insertion loss and inter-symbol interference in the system before the input of the TUSB1046-DCIRNQT. The receiver overcomes these losses by attenuating the low frequency components of the signals with respect to the high frequency components. The proper gain setting should be selected to match the channel insertion loss before the input of the TUSB1046-DCIRNQT receivers. Two 4-level inputs pins enable up to 16 possible equalization settings. USB3.1 upstream path, USB3.1 downstream path, and DisplayPort each have their own two 4-level inputs. The TUSB1046-DCI also provides the flexibility of adjusting settings through I2C registers.

6. Application Information

The TUSB1046-DCIRNQT is a linear redriver designed specifically to compensation for intersymbol interference (ISI) jitter caused by signal attenuation through a passive medium like PCB traces and cables. Because the TUSB1046-DCIRNQT has four independent DisplayPort 1.4 inputs, one upstream facing USB 3.1 Gen1/Gen2 input, and two downstream facing USB 3.1 Gen1/Gen2 inputs, it can be optimized to correct ISI on all those seven inputs through 16 different equalization choices. Placing the TUSB1046-DCI between a USB3.1 Host/DisplayPort 1.4 GPU and a USB3.1 Type-C receptacle can correct signal integrity issues resulting in a more robust system.