ZHCSQR9A July   2022  – July 2023 TDP1204

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Switching Characteristics
    8. 6.8 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Functional Block Diagram
    2. 8.2 Feature Description
      1. 8.2.1  4-Level Inputs
      2. 8.2.2  I/O Voltage Level Selection
      3. 8.2.3  HPD_OUT
      4. 8.2.4  Lane Control
      5. 8.2.5  Swap
      6. 8.2.6  Linear and Limited Redriver
      7. 8.2.7  Main Link Inputs
      8. 8.2.8  Receiver Equalizer
      9. 8.2.9  CTLE Bypass
      10. 8.2.10 Adaptive Equalization in HDMI 2.1 FRL
        1. 8.2.10.1 HDMI 2.1 TX Compliance Testing with AEQ Enabled
      11. 8.2.11 HDMI 2.1 Link Training Compatible Rx EQ
      12. 8.2.12 Input Signal Detect
      13. 8.2.13 Main Link Outputs
        1. 8.2.13.1 Transmitter Bias
        2. 8.2.13.2 Transmitter Impedance Control
        3. 8.2.13.3 TX Slew Rate Control
        4. 8.2.13.4 TX Pre-Emphasis and De-Emphasis Control
        5. 8.2.13.5 TX Swing Control
      14. 8.2.14 DDC Buffer
      15. 8.2.15 HDMI DDC Capacitance
      16. 8.2.16 DisplayPort
    3. 8.3 Device Functional Modes
      1. 8.3.1 MODE Control
        1. 8.3.1.1 I2C Mode (MODE = "F")
        2. 8.3.1.2 Pin Strap Modes
          1. 8.3.1.2.1 Pin-Strap: HDMI 1.4 and HDMI 2.0 Functional Description
          2. 8.3.1.2.2 Pin-Strap HDMI 2.1 Function (MODE = "0"): Fixed Rx EQ and DDC Buffer Enabled
          3. 8.3.1.2.3 Pin-Strap HDMI 2.1 Function (MODE = "1"): Flexible RX EQ and DDC Buffer Enabled
          4. 8.3.1.2.4 Pin-Strap HDMI 2.1 Function (MODE = "R"): Flexible Rx EQ and DDC Buffer Disabled
      2. 8.3.2 DDC Snoop Feature
        1. 8.3.2.1 HDMI Type
        2. 8.3.2.2 HDMI 2.1 FRL Snoop
      3. 8.3.3 Low Power States
    4. 8.4 Programming
      1. 8.4.1 Pseudocode Examples
        1. 8.4.1.1 HDMI 2.1 Source Example with DDC Snoop and DDC Buffer Enabled
        2. 8.4.1.2 HDMI 2.1 Source Example with DDC Snoop Disabled and DDC Buffer Disabled
      2. 8.4.2 TDP1204 I2C Address Options
      3. 8.4.3 I2C Target Behavior
    5. 8.5 Register Maps
      1. 8.5.1 TDP1204 Registers
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Source-Side Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Pre-Channel (LAB)
        2. 9.2.2.2 Post-Channel (LCD)
        3. 9.2.2.3 Common Mode Choke
        4. 9.2.2.4 ESD Protection
      3. 9.2.3 Application Curves
    3. 9.3 Typical Sink-Side Application
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedures
    4. 9.4 Power Supply Recommendations
      1. 9.4.1 Supply Decoupling
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
      2. 9.5.2 Layout Example
  11. 10器件和文档支持
    1. 10.1 文档支持
      1. 10.1.1 相关文档
    2. 10.2 接收文档更新通知
    3. 10.3 支持资源
    4. 10.4 商标
    5. 10.5 静电放电警告
    6. 10.6 术语表
  12. 11Mechanical, Packaging, and Orderable Information

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8.2.6 Linear and Limited Redriver

The TDP1204 supports both linear and limited redriver. Selection between linear and limited can be done from the LINEAR_EN pin in pin-strap mode or through GLOBAL_LINR_EN register in I2C mode.

The limited redriver mode will decouple TDP1204 transmitter's voltage swing, pre-emphasis or de-emphasis, and slew rate from the GPUs transmitter. This allows the GPU to use a lower power TX setting and depends on the TDP1204 transmitter to meet TX compliance requirements. For source applications, it is recommended to configure TDP1204 as a limited redriver. It is not recommended to use limited redriver mode in sink applications.

Unlike limited redriver mode, in linear redriver mode the TDP1204 transmitter's output is not decoupled from the GPU's transmitter. In linear redriver mode, the TDP1204 transmitter's output is a linear function of its input. The linear redriver mode offers transparency to link training which makes it perfect for HDMI 2.1 applications. For HDMI sink applications, it is recommended to configure TDP1204 as a linear redriver.

Table 8-4 lists the requirements that the GPU transmitter must meet if linear redriver mode is used in an HDMI 2.1 source application. Linear redriver mode should only be used for HDMI 2.1 data rates. For HDMI 1.4 and 2.0, the TDP1204 should be configured for limited mode (LINEAR_EN = "0" or "1").

Table 8-4 Linear Redriver Mode: GPU TX Requirements for HDMI Source Applications
GPU TX Parameter Min Max Units
Single-ended TX swing for HDMI 2.1 400 500 mV
TX rise/fall time for 3, 6, 8, 10, and 12-Gbps FRL 16 mV/ps

The TDP1204 in pin-strap mode provides the option to dynamically switch between limited and linear based on the HDMI mode of operation. The feature is enabled by setting LINEAR_EN pin = "1".

Table 8-5 Pin-Strap Mode LINEAR_EN Pin Function
LINEAR_EN Pin Level HDMI 1.4, 2.0, or DP HDMI 2.1 FRL
1 Limited Enabled Linear Enabled
F Linear Enabled
Recommended for DP and HDMI sink application.		 Linear Enabled
Recommended for DP and HDMI sink application.
R Reserved Reserved
0 Limited Enabled.
Recommended for HDMI source application		 Limited Enabled
Recommended for HDMI source application