ZHCSFY1F December   2016  – April 2024 TDP158

PRODUCTION DATA  

  1.   1
  2. 特性
  3. 应用
  4. 说明
  5. Pin Configuration and Functions
  6. 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  Electrical Characteristics, Power Supply
    6. 5.6  Electrical Characteristics, Differential Input
    7. 5.7  Electrical Characteristics, TMDS Differential Output
    8. 5.8  Electrical Characteristics, DDC, I2C, HPD, and ARC
    9. 5.9  Electrical Characteristics, TMDS Differential Output in DP-Mode
    10. 5.10 Switching Characteristics, TMDS
    11. 5.11 Switching Characteristics, HPD
    12. 5.12 Switching Characteristics, DDC and I2C
    13. 5.13 Typical Characteristics
  7. Parameter Measurement Information
  8. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Reset Implementation
      2. 7.3.2  Operation Timing
      3. 7.3.3  Lane Control
      4. 7.3.4  Swap
      5. 7.3.5  Main Link Inputs
      6. 7.3.6  Receiver Equalizer
      7. 7.3.7  Input Signal Detect Block
      8. 7.3.8  Transmitter Impedance Control
      9. 7.3.9  TMDS Outputs
      10. 7.3.10 Slew Rate Control
      11. 7.3.11 Pre-Emphasis
      12. 7.3.12 DP-Mode Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 DDC Training for HDMI 2.0 Data Rate Monitor
      2. 7.4.2 DDC Functional Description
    5. 7.5 Register Maps
      1. 7.5.1  Local I2C Control BIT Access TAG Convention
      2. 7.5.2  BIT Access Tag Conventions
      3. 7.5.3  CSR Bit Field Definitions, DEVICE_ID (address = 00h≅07h)
      4. 7.5.4  CSR Bit Field Definitions, REV_ID (address = 08h )
      5. 7.5.5  CSR Bit Field Definitions – MISC CONTROL 09h (address = 09h)
      6. 7.5.6  CSR Bit Field Definitions – MISC CONTROL 0Ah (address = 0Ah)
      7. 7.5.7  CSR Bit Field Definitions – MISC CONTROL 0Bh (address = 0Bh)
      8. 7.5.8  CSR Bit Field Definitions – MISC CONTROL 0Ch (address = 0Ch)
      9. 7.5.9  CSR Bit Field Definitions, Equalization Control Register (address = 0Dh)
      10. 7.5.10 CSR Bit Field Definitions, POWER MODE STATUS (address = 20h)
      11. 7.5.11 CSR Bit Field Definitions, DP-Mode and INDIVIDUAL LANE CONTROL (address = 30h)
      12. 7.5.12 CSR Bit Field Definitions, DP-Mode and INDIVIDUAL LANE CONTROL (address = 31h)
      13. 7.5.13 CSR Bit Field Definitions, DP-Mode and INDIVIDUAL LANE CONTROL (address = 32h)
      14. 7.5.14 CSR Bit Field Definitions, DP-Mode and INDIVIDUAL LANE CONTROL (address = 33h)
      15. 7.5.15 CSR Bit Field Definitions, DP-Mode and INDIVIDUAL LANE CONTROL (address = 34h)
      16. 7.5.16 CSR Bit Field Definitions, DP-Mode and INDIVIDUAL LANE CONTROL (address = 35h)
      17. 7.5.17 CSR Bit Field Definitions, DP-Mode and INDIVIDUAL LANE CONTROL (address = 4Dh)
      18. 7.5.18 CSR Bit Field Definitions, DP-Mode and INDIVIDUAL LANE CONTROL (address = 4Eh)
      19. 7.5.19 CSR Bit Field Definitions, DP-Mode and INDIVIDUAL LANE CONTROL (address = 4Fh)
  9. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Source Side
        2. 8.2.2.2 DDC Pull Up Resistors
      3. 8.2.3 Application Curves
      4. 8.2.4 Application with DDC Snoop
        1. 8.2.4.1 Source Side HDMI Application
      5. 8.2.5 9.1.2 Source Side HDMI /DP Application Using DP-Mode
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Power Management
      2. 8.3.2 Standby Power
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 接收文档更新通知
    3. 9.3 支持资源
    4. 9.4 Trademarks
    5. 9.5 静电放电警告
    6. 9.6 术语表
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

DDC Training for HDMI 2.0 Data Rate Monitor

As part of discovery, the source reads the sink E-EDID information to understand the sink’s capabilities. The supported data rate comes from the HDMI Forum Vendor Specific Data Block (HF-VSDB) MAX_TMDS_Character_Rate byte. Depending upon the value, the source will write to target address 0xA8 offset 0x20 bit1, TMDS_CLOCK_RATIO_STATUS. The TDP158 snoops the DDC link to determine the TMDS clock ratio status and thus sets its own TMDS_CLOCK_RATIO_STATUS bit accordingly. If a ‘1’ is written by the source the TMDS clock is 1/40 of TMDS bit period. If a ‘0’ is written, then the TMDS clock is 1/10 of TMDS bit period.

The TDP158 will always default to 1/10 of TMDS bit period unless a ‘1’ is written to address 0xA8 offset 0x20 bit 1 or during a read by the source this bit is set. This helps determine source termination when automatic source termination select is enabled. Otherwise this bit has no other impact on the TDP158. When HPD_SNK is de-asserted this bit is reset to default values of 0 if this feature is enabled. If the source does not write this bit to the sink or during the read the bit is not set the TDP158 will not set the output termination to 75Ω to 150Ω in support of HDMI 2.0. If the TDP158 has entered a power down state using HDP_SNK = low or OE = low this bit is cleared and will be set on a read or write where this bit is set. When DDC_TRAIN_SETDISABLE is 1’b0 the TMDS_CLOCK_RATIO_STATUS bit will reflect the value of the DDC snoop. When DDC_TRAIN_SETDISABLE is 1’b1 the TMDS_CLOCK_RATIO_STATUS bit is set by I2C and DDC snoop is ignored and thus automatic TERM control is ignored and must be manually set. To go back to snoop and automatic TERM control the DDC_TRAIN_SETDISABLE bit has to be cleared and TERM set back to automatic control.