SLLSFL3 April   2022 TUSB1004

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Revision History
  4. 4 Pin Configuration and Functions
  5. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Power Supply Characteristics
    6. 5.6  Control I/O DC Electrical Characteristics
    7. 5.7  USB Electrical Characteristics
    8. 5.8  Timing Requirements
    9. 5.9  Switching Characteristics
    10. 5.10 Typical Characteristics
  6. 6 Parameter Measurement Information
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 4-Level Inputs
      2. 7.3.2 USB Receiver Linear Equalization
        1. 7.3.2.1 Linear EQ Configuration
        2. 7.3.2.2 Full Adaptive Equalization
        3. 7.3.2.3 Fast Adaptive Equalization
      3. 7.3.3 USB Transmitter
        1. 7.3.3.1 Linearity VOD
        2. 7.3.3.2 Limited VOD
        3. 7.3.3.3 Transmit Equalization (Limited Redriver Mode Only)
      4. 7.3.4 USB 3.1 x2 Description
      5. 7.3.5 USB Polarity Inversion
      6. 7.3.6 Receiver Detect Control
    4. 7.4 Device Functional Modes
      1. 7.4.1 MODE Pin
      2. 7.4.2 Rx EQ Configuration in Pin-Strap Mode
      3. 7.4.3 USB 3.2 Power States
      4. 7.4.4 Disabling U1 and U2
    5. 7.5 Programming
      1. 7.5.1 Pseudocode Examples
        1. 7.5.1.1 Fixed EQ with Linear Redriver Mode
        2. 7.5.1.2 Fixed EQ with Limited Redriver Mode
        3. 7.5.1.3 Fast AEQ with Linear Redriver Mode
        4. 7.5.1.4 Fast AEQ with Limited Redriver Mode
        5. 7.5.1.5 Full AEQ with Linear Redriver Mode
        6. 7.5.1.6 Full AEQ with Limited Redriver Mode
      2. 7.5.2 TUSB1004 I2C Address Options
      3. 7.5.3 TUSB1004 I2C Target Behavior
    6. 7.6 Register Map
      1. 7.6.1 TUSB1004 Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
  9. 9 Typical Application
  10. 10Design Requirements
  11. 11Detailed Design Procedure
    1. 11.1 USB SSTX1/2 Receiver Configuration
    2. 11.2 USB CRX1/2 Receiver Configuration
      1. 11.2.1 Fixed Equalization
      2. 11.2.2 Full Adaptive Equalization
      3. 11.2.3 Fast Adaptive Equalization
  12. 12Application Curves
  13. 13Power Supply Recommendations
  14. 14Layout
    1. 14.1 Layout Guidelines
    2. 14.2 Layout Example
  15. 15Device and Documentation Support
    1. 15.1 Receiving Notification of Documentation Updates
    2. 15.2 Support Resources
    3. 15.3 Trademarks
    4. 15.4 Electrostatic Discharge Caution
    5. 15.5 Glossary
  16. 16Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.2 USB 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 TUSB1004. 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 TUSB1004 receivers. Two 4-level inputs pins enable up to 16 possible equalization settings when in pin-strap mode. The TUSB1004's USB 3.2 host, hub, and device receivers (SSTX1/2) and USB 3.2 USB connector receivers (CRX1/2) each have their own two 4-level inputs. The TUSB1004 also provides the flexibility of adjusting settings through I2C registers.

The TUSB1004's USB host, hub, and device facing port receiver (SSTX1/2) only support Fixed EQ (FEQ). The TUSB1004 implements three different equalizer features for the USB connector facing port receivers (CRX1 and CRX2): Fixed EQ (FEQ), Fast Adaptive EQ (Fast AEQ), and Full Adaptive EQ (Full AEQ). In Fixed EQ operation, a single setting is used for all possible devices (with and without cable) inserted into the USB receptacle. The Fast AEQ feature will distinguish between a short channel and a long channel. A short channel represents a low loss use case of a USB 3.2 device plugged directly into USB receptacle without a cable. A long channel represents the high loss use case of the USB 3.2 device plugged into the receptacle through a USB cable. In Fast AEQ mode, TUSB1004 will select between two pre-determined settings based on whether or not channel is short or long. When TUSB1004 is configured for Full AEQ, the TUSB1004 will automatically determine what it believes is the best equalization setting each time a USB device is inserted into the USB receptacle. In Full AEQ mode, the TUSB1004 will attempt to determine the best settings regardless if the channel is short, long, or somewhere in between.

Note: Adaptive EQ is only supported on CRX1 and CRX2. Adaptive EQ must only be used when CRX1 and CRX2 is connected to a USB receptacle. If CRX1 and CRX2 is connected directly (not through a USB receptacle) to a USB Host, USB Hub or USB Device, then adaptive EQ must be disabled. AEQ should never be enabled in a active cable application. If daisy chaining multiple TUSB1004, AEQ should only be enabled on the TUSB1004 that is near the USB receptacle.