DLPU114A August   2024  – November 2024 DLPC8445

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Scope
  5. 2 Introduction
    1. 2.1 System Overview
    2. 2.2 System Initialization
      1. 2.2.1 Boot ROM
      2. 2.2.2 Secondary Boot
      3. 2.2.3 Main Application
      4. 2.2.4 DLPC8445 and DLPC8445V Controller Startup
  6. 3 Software Overview
    1. 3.1 Interface Protocol
      1. 3.1.1 Supported Interfaces
      2. 3.1.2 I2C Target
      3. 3.1.3 USB
      4. 3.1.4 UART Settings
  7. 4 Acronyms
  8. 5 Command Protocol
    1. 5.1 Command Packet
    2. 5.2 Response Packet
    3. 5.3 Error Handling and Recovery
    4. 5.4 System Busy—I2C Scenarios
      1. 5.4.1 HOST_IRQ Implementation
      2. 5.4.2 Short Status Response
    5. 5.5 Support for Variable Data Size
  9. 6 Command Descriptions
  10. 7 BootROM Commands
    1. 7.1 BootROM
      1. 7.1.1  Read Boot Hold Reason (12h)
        1. 7.1.1.1 Return Parameter(s)
      2. 7.1.2  Read Flash ID (20h)
        1. 7.1.2.1 Return Parameter(s)
      3. 7.1.3  Read Get Flash Sector Information (21h)
        1. 7.1.3.1 Return Parameter(s)
      4. 7.1.4  Write Unlock Flash For Update (22h)
        1. 7.1.4.1 Write Parameter(s)
      5. 7.1.5  Read Unlock Flash For Update (22h)
        1. 7.1.5.1 Return Parameter(s)
      6. 7.1.6  Write Erase Sector (23h)
        1. 7.1.6.1 Write Parameter(s)
      7. 7.1.7  Write Initialize Flash Read Write Settings (24h)
        1. 7.1.7.1 Write Parameter(s)
      8. 7.1.8  Write Flash Write (25h)
        1. 7.1.8.1 Write Parameter(s)
      9. 7.1.9  Read Flash Write (25h)
        1. 7.1.9.1 Read Parameter(s)
        2. 7.1.9.2 Return Parameter(s)
      10. 7.1.10 Read Checksum (26h)
        1. 7.1.10.1 Read Parameter(s)
        2. 7.1.10.2 Return Parameter(s)
      11. 7.1.11 Write Full Flash Erase (28h)
        1. 7.1.11.1 Write Parameter(s)
      12. 7.1.12 Write System Type (03h)
        1. 7.1.12.1 Write Parameter(s)
      13. 7.1.13 Read System Type (03h)
        1. 7.1.13.1 Return Parameter(s)
      14. 7.1.14 Write Clear Error History (05h)
        1. 7.1.14.1 Write Parameter(s)
      15. 7.1.15 Read Error History (06h)
        1. 7.1.15.1 Return Parameter(s)
  11. 8 Common Commands
    1. 8.1 Common
      1. 8.1.1 Read Mode (00h)
        1. 8.1.1.1 Return Parameter(s)
      2. 8.1.2 Read Version (01h)
        1. 8.1.2.1 Return Parameter(s)
      3. 8.1.3 Write Switch Application (02h)
        1. 8.1.3.1 Write Parameter(s)
      4. 8.1.4 Read Extended Software Version (04h)
        1. 8.1.4.1 Return Parameter(s)
  12. 9 Main Application Commands
    1. 9.1  System
      1. 9.1.1  Read Controller ID (40h)
        1. 9.1.1.1 Return Parameter(s)
      2. 9.1.2  Read DMD ID (41h)
        1. 9.1.2.1 Return Parameter(s)
      3. 9.1.3  Read PMIC ID (42h)
        1. 9.1.3.1 Return Parameter(s)
      4. 9.1.4  Read DMD Training Results (43h)
        1. 9.1.4.1 Read Parameter(s)
        2. 9.1.4.2 Return Parameter(s)
      5. 9.1.5  Write DMD True Global Reset (44h)
        1. 9.1.5.1 Write Parameter(s)
      6. 9.1.6  Read DMD True Global Reset (44h)
        1. 9.1.6.1 Return Parameter(s)
      7. 9.1.7  Read System Errors (45h)
        1. 9.1.7.1 Return Parameter(s)
      8. 9.1.8  Read System Status (46h)
        1. 9.1.8.1 Return Parameter(s)
      9. 9.1.9  Read Flash Version (48h)
        1. 9.1.9.1 Return Parameter(s)
      10. 9.1.10 Read System Temperature (4Ah)
        1. 9.1.10.1 Return Parameter(s)
      11. 9.1.11 Read Last Command Result (4Dh)
        1. 9.1.11.1 Return Parameter(s)
      12. 9.1.12 Read DLPA Main Status (4Eh)
        1. 9.1.12.1 Return Parameter(s)
    2. 9.2  Color Processing
      1. 9.2.1  Write HDR Source Configuration (71h)
        1. 9.2.1.1 Write Parameter(s)
      2. 9.2.2  Read HDR Source Configuration (71h)
        1. 9.2.2.1 Return Parameter(s)
      3. 9.2.3  Write System Brightness Range Setting (73h)
        1. 9.2.3.1 Write Parameter(s)
      4. 9.2.4  Read System Brightness Range Setting (73h)
        1. 9.2.4.1 Return Parameter(s)
      5. 9.2.5  Write WPC Enable (74h)
        1. 9.2.5.1 Write Parameter(s)
      6. 9.2.6  Read WPC Enable (74h)
        1. 9.2.6.1 Return Parameter(s)
      7. 9.2.7  Read WPC Duty Cycles (76h)
        1. 9.2.7.1 Return Parameter(s)
      8. 9.2.8  Read WPC Sensor Output (77h)
        1. 9.2.8.1 Return Parameter(s)
      9. 9.2.9  Write Image CCA Coordinates (78h)
        1. 9.2.9.1 Write Parameter(s)
      10. 9.2.10 Read Image CCA Coordinates (78h)
        1. 9.2.10.1 Return Parameter(s)
      11. 9.2.11 Write Image HSG (79h)
        1. 9.2.11.1 Write Parameter(s)
      12. 9.2.12 Read Image HSG (79h)
        1. 9.2.12.1 Return Parameter(s)
      13. 9.2.13 Write Image CCA HSG Enable Mode (7Bh)
        1. 9.2.13.1 Write Parameter(s)
      14. 9.2.14 Read Image CCA HSG Enable Mode (7Bh)
        1. 9.2.14.1 Return Parameter(s)
      15. 9.2.15 Write WPC LED Calibration Matrix (7Ch)
        1. 9.2.15.1 Write Parameter(s)
      16. 9.2.16 Read WPC LED Calibration Matrix (7Ch)
        1. 9.2.16.1 Return Parameter(s)
      17. 9.2.17 Write WPC Sensor Calibration Matrix (7Dh)
        1. 9.2.17.1 Write Parameter(s)
      18. 9.2.18 Read WPC Sensor Calibration Matrix (7Dh)
        1. 9.2.18.1 Return Parameter(s)
      19. 9.2.19 Write WPC Target Manual Mode (87h)
        1. 9.2.19.1 Write Parameter(s)
      20. 9.2.20 Read WPC Target Manual Mode (87h)
        1. 9.2.20.1 Return Parameter(s)
      21. 9.2.21 Write WPC Target Manual Color Point (88h)
        1. 9.2.21.1 Write Parameter(s)
      22. 9.2.22 Read WPC Target Manual Color Point (88h)
        1. 9.2.22.1 Return Parameter(s)
      23. 9.2.23 Read WPC Target Color Point (89h)
        1. 9.2.23.1 Return Parameter(s)
      24. 9.2.24 Read WPC System Color Point (8Ah)
        1. 9.2.24.1 Return Parameter(s)
    3. 9.3  TPG
      1. 9.3.1  Write TPG Pre Defined Timings Queued (A0h)
        1. 9.3.1.1 Write Parameter(s)
      2. 9.3.2  Read TPG Pre Defined Timings Queued (A0h)
        1. 9.3.2.1 Return Parameter(s)
      3. 9.3.3  Write TPG Frame Rate (A1h)
        1. 9.3.3.1 Write Parameter(s)
      4. 9.3.4  Read TPG Frame Rate (A1h)
        1. 9.3.4.1 Return Parameter(s)
      5. 9.3.5  Write TPG Pre Defined Pattern (A2h)
        1. 9.3.5.1 Write Parameter(s)
      6. 9.3.6  Read TPG Pre Defined Pattern (A2h)
        1. 9.3.6.1 Return Parameter(s)
      7. 9.3.7  Write TPG Border (A3h)
        1. 9.3.7.1 Write Parameter(s)
      8. 9.3.8  Read TPG Border (A3h)
        1. 9.3.8.1 Return Parameter(s)
      9. 9.3.9  Write TPG Solid Field (A4h)
        1. 9.3.9.1 Write Parameter(s)
      10. 9.3.10 Read TPG Solid Field (A4h)
        1. 9.3.10.1 Return Parameter(s)
      11. 9.3.11 Write TPG Horizontal Ramp (A5h)
        1. 9.3.11.1 Write Parameter(s)
      12. 9.3.12 Read TPG Horizontal Ramp (A5h)
        1. 9.3.12.1 Return Parameter(s)
      13. 9.3.13 Write TPG Vertical Ramp (A5h)
        1. 9.3.13.1 Write Parameter(s)
      14. 9.3.14 Read TPG Vertical Ramp (A5h)
        1. 9.3.14.1 Return Parameter(s)
      15. 9.3.15 Write TPG Horizontal Lines (A5h)
        1. 9.3.15.1 Write Parameter(s)
      16. 9.3.16 Read TPG Horizontal Lines (A5h)
        1. 9.3.16.1 Return Parameter(s)
      17. 9.3.17 Write TPG Diagonal Lines (A5h)
        1. 9.3.17.1 Write Parameter(s)
      18. 9.3.18 Read TPG Diagonal Lines (A5h)
        1. 9.3.18.1 Return Parameter(s)
      19. 9.3.19 Write TPG Vertical Lines (A5h)
        1. 9.3.19.1 Write Parameter(s)
      20. 9.3.20 Read TPG Vertical Lines (A5h)
        1. 9.3.20.1 Return Parameter(s)
      21. 9.3.21 Write TPG Grid (A5h)
        1. 9.3.21.1 Write Parameter(s)
      22. 9.3.22 Read TPG Grid (A5h)
        1. 9.3.22.1 Return Parameter(s)
      23. 9.3.23 Write TPG Checkerboard (A5h)
        1. 9.3.23.1 Write Parameter(s)
      24. 9.3.24 Read TPG Checkerboard (A5h)
        1. 9.3.24.1 Return Parameter(s)
      25. 9.3.25 Write TPG Colorbars (A5h)
        1. 9.3.25.1 Write Parameter(s)
      26. 9.3.26 Write TPG Multi Color Horizontal Ramp (A5h)
        1. 9.3.26.1 Write Parameter(s)
      27. 9.3.27 Read TPG Multi Color Horizontal Ramp (A5h)
        1. 9.3.27.1 Return Parameter(s)
      28. 9.3.28 Write TPG Fixed Step Horizontal Ramp (A5h)
        1. 9.3.28.1 Write Parameter(s)
      29. 9.3.29 Read TPG Fixed Step Horizontal Ramp (A5h)
        1. 9.3.29.1 Return Parameter(s)
      30. 9.3.30 Write TPG Diamond Diagonal Lines (A5h)
        1. 9.3.30.1 Write Parameter(s)
      31. 9.3.31 Read TPG Diamond Diagonal Lines (A5h)
        1. 9.3.31.1 Return Parameter(s)
    4. 9.4  Source
      1. 9.4.1  Read Input Source Status (B1h)
        1. 9.4.1.1 Return Parameter(s)
      2. 9.4.2  Read Source Timings And Errors (B2h)
        1. 9.4.2.1 Return Parameter(s)
      3. 9.4.3  Write Enable Three D (B3h)
        1. 9.4.3.1 Write Parameter(s)
      4. 9.4.4  Read Enable Three D (B3h)
        1. 9.4.4.1 Return Parameter(s)
      5. 9.4.5  Write External Source Sync Polarity (B4h)
        1. 9.4.5.1 Write Parameter(s)
      6. 9.4.6  Read External Source Sync Polarity (B4h)
        1. 9.4.6.1 Return Parameter(s)
      7. 9.4.7  Write VBO Lane Configuration (BAh)
        1. 9.4.7.1 Write Parameter(s)
      8. 9.4.8  Read VBO Lane Configuration (BAh)
        1. 9.4.8.1 Read Parameter(s)
        2. 9.4.8.2 Return Parameter(s)
      9. 9.4.9  Write VBO Configuration (BBh)
        1. 9.4.9.1 Write Parameter(s)
      10. 9.4.10 Read VBO Configuration (BBh)
        1. 9.4.10.1 Return Parameter(s)
      11. 9.4.11 Read VBO Status (BCh)
        1. 9.4.11.1 Return Parameter(s)
      12. 9.4.12 Read Frame CRC (BDh)
        1. 9.4.12.1 Return Parameter(s)
      13. 9.4.13 Write VRR Enable Queued (BEh)
        1. 9.4.13.1 Write Parameter(s)
      14. 9.4.14 Read VRR Enable Queued (BEh)
        1. 9.4.14.1 Return Parameter(s)
    5. 9.5  Splash
      1. 9.5.1 Write Splash Screen Select (C1h)
        1. 9.5.1.1 Write Parameter(s)
      2. 9.5.2 Read Splash Screen Select (C1h)
        1. 9.5.2.1 Return Parameter(s)
      3. 9.5.3 Read Splash Screen Header (C2h)
        1. 9.5.3.1 Read Parameter(s)
        2. 9.5.3.2 Return Parameter(s)
    6. 9.6  Illumination
      1. 9.6.1 Write LED Enable (D0h)
        1. 9.6.1.1 Write Parameter(s)
      2. 9.6.2 Read LED Enable (D0h)
        1. 9.6.2.1 Return Parameter(s)
      3. 9.6.3 Write LED Currents (D1h)
        1. 9.6.3.1 Write Parameter(s)
      4. 9.6.4 Read LED Currents (D1h)
        1. 9.6.4.1 Return Parameter(s)
      5. 9.6.5 Write LED Max Currents (D5h)
        1. 9.6.5.1 Write Parameter(s)
      6. 9.6.6 Read LED Max Currents (D5h)
        1. 9.6.6.1 Return Parameter(s)
      7. 9.6.7 Read LED Min Currents (D6h)
        1. 9.6.7.1 Return Parameter(s)
    7. 9.7  Display
      1. 9.7.1  Write Execute Display (E1h)
        1. 9.7.1.1 Write Parameter(s)
      2. 9.7.2  Read Execute Display Status (E2h)
        1. 9.7.2.1 Return Parameter(s)
      3. 9.7.3  Write Input Image Size Queued (E3h)
        1. 9.7.3.1 Write Parameter(s)
      4. 9.7.4  Read Input Image Size Queued (E3h)
        1. 9.7.4.1 Return Parameter(s)
      5. 9.7.5  Write Image Crop Queued (E4h)
        1. 9.7.5.1 Write Parameter(s)
      6. 9.7.6  Read Image Crop Queued (E4h)
        1. 9.7.6.1 Return Parameter(s)
      7. 9.7.7  Write Display Size Queued (E5h)
        1. 9.7.7.1 Write Parameter(s)
      8. 9.7.8  Read Display Size Queued (E5h)
        1. 9.7.8.1 Return Parameter(s)
      9. 9.7.9  Write Display Image Orientation Queued (E6h)
        1. 9.7.9.1 Write Parameter(s)
      10. 9.7.10 Read Display Image Orientation Queued (E6h)
        1. 9.7.10.1 Return Parameter(s)
      11. 9.7.11 Write Display Curtain (E7h)
        1. 9.7.11.1 Write Parameter(s)
      12. 9.7.12 Read Display Curtain (E7h)
        1. 9.7.12.1 Return Parameter(s)
      13. 9.7.13 Write Image Freeze (E8h)
        1. 9.7.13.1 Write Parameter(s)
      14. 9.7.14 Read Image Freeze (E8h)
        1. 9.7.14.1 Return Parameter(s)
      15. 9.7.15 Write Border Color (E9h)
        1. 9.7.15.1 Write Parameter(s)
      16. 9.7.16 Read Border Color (E9h)
        1. 9.7.16.1 Return Parameter(s)
    8. 9.8  Sequence
      1. 9.8.1 Read Is Discrete Duty Cycle Supported (57h)
        1. 9.8.1.1 Return Parameter(s)
      2. 9.8.2 Write System Look Index (F0h)
        1. 9.8.2.1 Write Parameter(s)
      3. 9.8.3 Read System Look Index (F0h)
        1. 9.8.3.1 Return Parameter(s)
      4. 9.8.4 Write Color Duty Cycles (F1h)
        1. 9.8.4.1 Write Parameter(s)
      5. 9.8.5 Read Color Duty Cycles (F1h)
        1. 9.8.5.1 Return Parameter(s)
      6. 9.8.6 Write Discrete Duty Cycle Index (F2h)
        1. 9.8.6.1 Write Parameter(s)
      7. 9.8.7 Read Discrete Duty Cycle Index (F2h)
        1. 9.8.7.1 Return Parameter(s)
      8. 9.8.8 Read Min Max Duty Cycle Supported (F4h)
        1. 9.8.8.1 Read Parameter(s)
        2. 9.8.8.2 Return Parameter(s)
      9. 9.8.9 Read LED Illumination Delay (F5h)
        1. 9.8.9.1 Read Parameter(s)
        2. 9.8.9.2 Return Parameter(s)
    9. 9.9  Image Processing
      1. 9.9.1  Write Dynamic Black Enable (D2h)
        1. 9.9.1.1 Write Parameter(s)
      2. 9.9.2  Read Dynamic Black Enable (D2h)
        1. 9.9.2.1 Return Parameter(s)
      3. 9.9.3  Write Image Pixel Brightness (F6h)
        1. 9.9.3.1 Write Parameter(s)
      4. 9.9.4  Read Image Pixel Brightness (F6h)
        1. 9.9.4.1 Return Parameter(s)
      5. 9.9.5  Write Image Pixel Contrast (F7h)
        1. 9.9.5.1 Write Parameter(s)
      6. 9.9.6  Read Image Pixel Contrast (F7h)
        1. 9.9.6.1 Return Parameter(s)
      7. 9.9.7  Write Degamma Table (F8h)
        1. 9.9.7.1 Write Parameter(s)
      8. 9.9.8  Read Degamma Table (F8h)
        1. 9.9.8.1 Return Parameter(s)
      9. 9.9.9  Write Image Sharpness (F9h)
        1. 9.9.9.1 Write Parameter(s)
      10. 9.9.10 Read Image Sharpness (F9h)
        1. 9.9.10.1 Return Parameter(s)
      11. 9.9.11 Write Image CSC Index Value (FAh)
        1. 9.9.11.1 Write Parameter(s)
      12. 9.9.12 Read Image CSC Index Value (FAh)
        1. 9.9.12.1 Return Parameter(s)
      13. 9.9.13 Write XPR Filter Strength Command (FBh)
        1. 9.9.13.1 Write Parameter(s)
      14. 9.9.14 Read XPR Filter Strength Command (FBh)
        1. 9.9.14.1 Return Parameter(s)
    10. 9.10 Blending
      1. 9.10.1 Write Blending Function Control (58h)
        1. 9.10.1.1 Write Parameter(s)
      2. 9.10.2 Read Blending Function Control (58h)
        1. 9.10.2.1 Return Parameter(s)
      3. 9.10.3 Write Blendmap Control Points (59h)
        1. 9.10.3.1 Write Parameter(s)
      4. 9.10.4 Read Blendmap Control Points (59h)
        1. 9.10.4.1 Return Parameter(s)
      5. 9.10.5 Write Blendmap Gain Values (5Ah)
        1. 9.10.5.1 Write Parameter(s)
      6. 9.10.6 Read Blendmap Gain Values (5Ah)
        1. 9.10.6.1 Read Parameter(s)
        2. 9.10.6.2 Return Parameter(s)
      7. 9.10.7 Write Blendmap Offset Values (5Bh)
        1. 9.10.7.1 Write Parameter(s)
      8. 9.10.8 Read Blendmap Offset Values (5Bh)
        1. 9.10.8.1 Read Parameter(s)
        2. 9.10.8.2 Return Parameter(s)
    11. 9.11 Peripherals
      1. 9.11.1  Write User Settings Commit Mode (92h)
        1. 9.11.1.1 Write Parameter(s)
      2. 9.11.2  Read User Settings Commit Mode (92h)
        1. 9.11.2.1 Return Parameter(s)
      3. 9.11.3  Write Use Factory Defaults On Next Power Up (93h)
        1. 9.11.3.1 Write Parameter(s)
      4. 9.11.4  Write Update Lock State (94h)
        1. 9.11.4.1 Write Parameter(s)
      5. 9.11.5  Read Update Lock State (94h)
        1. 9.11.5.1 Return Parameter(s)
      6. 9.11.6  Write Data Invalidate (99h)
        1. 9.11.6.1 Write Parameter(s)
      7. 9.11.7  Write Commit Data (9Ah)
        1. 9.11.7.1 Write Parameter(s)
      8. 9.11.8  Read Data Operations Status (9Bh)
        1. 9.11.8.1 Return Parameter(s)
      9. 9.11.9  Read DMD Temperature (9Ch)
        1. 9.11.9.1 Read Parameter(s)
        2. 9.11.9.2 Return Parameter(s)
      10. 9.11.10 Write Calibration Data (9Dh)
        1. 9.11.10.1 Write Parameter(s)
      11. 9.11.11 Read Calibration Data (9Dh)
        1. 9.11.11.1 Read Parameter(s)
        2. 9.11.11.2 Return Parameter(s)
    12. 9.12 Warp
      1. 9.12.1 Write Warp Feature Control Queued (61h)
        1. 9.12.1.1 Write Parameter(s)
      2. 9.12.2 Read Warp Feature Control Queued (61h)
        1. 9.12.2.1 Read Parameter(s)
        2. 9.12.2.2 Return Parameter(s)
      3. 9.12.3 Write Optical Parameters Queued (62h)
        1. 9.12.3.1 Write Parameter(s)
      4. 9.12.4 Read Optical Parameters Queued (62h)
        1. 9.12.4.1 Return Parameter(s)
      5. 9.12.5 Write Keystone Angles Queued (63h)
        1. 9.12.5.1 Write Parameter(s)
      6. 9.12.6 Read Keystone Angles Queued (63h)
        1. 9.12.6.1 Return Parameter(s)
      7. 9.12.7 Write Keystone Corners Queued (64h)
        1. 9.12.7.1 Write Parameter(s)
      8. 9.12.8 Read Keystone Corners Queued (64h)
        1. 9.12.8.1 Return Parameter(s)
    13. 9.13 XPR
      1. 9.13.1  Write XPR Enable Mode Queued (80h)
        1. 9.13.1.1 Write Parameter(s)
      2. 9.13.2  Read XPR Enable Mode Queued (80h)
        1. 9.13.2.1 Return Parameter(s)
      3. 9.13.3  Write XPR Calibration Mode (81h)
        1. 9.13.3.1 Write Parameter(s)
      4. 9.13.4  Write XPR Actuator Position (82h)
        1. 9.13.4.1 Write Parameter(s)
      5. 9.13.5  Read XPR Actuator Position (82h)
        1. 9.13.5.1 Return Parameter(s)
      6. 9.13.6  Write XPR Actuator Dac Gain (83h)
        1. 9.13.6.1 Write Parameter(s)
      7. 9.13.7  Read XPR Actuator Dac Gain (83h)
        1. 9.13.7.1 Read Parameter(s)
        2. 9.13.7.2 Return Parameter(s)
      8. 9.13.8  Write XPR Actuator Subframe Delay (84h)
        1. 9.13.8.1 Write Parameter(s)
      9. 9.13.9  Read XPR Actuator Subframe Delay (84h)
        1. 9.13.9.1 Read Parameter(s)
        2. 9.13.9.2 Return Parameter(s)
      10. 9.13.10 Write XPR Actuator Dac Offset (85h)
        1. 9.13.10.1 Write Parameter(s)
      11. 9.13.11 Read XPR Actuator Dac Offset (85h)
        1. 9.13.11.1 Read Parameter(s)
        2. 9.13.11.2 Return Parameter(s)
      12. 9.13.12 Write XPR Actuator Fixed Output Level (86h)
        1. 9.13.12.1 Write Parameter(s)
      13. 9.13.13 Read XPR Actuator Fixed Output Level (86h)
        1. 9.13.13.1 Read Parameter(s)
        2. 9.13.13.2 Return Parameter(s)
  13. 10Notes On Use Cases
    1. 10.1 Program Flash Image Procedure
    2. 10.2 Source Setup Procedure
      1. 10.2.1 Loss Of Video Source
    3. 10.3 Variable Refresh Rate (VRR)
    4. 10.4 3D
    5. 10.5 High Dynamic Range (HDR)
  14. 11Error Codes
  15. 12Revision History

5.2 Response Packet

The response packet is the format in which the controller replies to the host. The response packet format is followed for both write responses and read responses. For write commands, the response packet is sent only if the "reply requested" bit is set in the command header. The controller matches the response header to the same format as the incoming command packet header. There is however an exception, if the response packet is for a command that expects variable number of data bytes, the response packet will always include the length field (irrespective of whether the command packet had length mentioned or not). Kindly refer to Support for Variable Data Size section for information related to variable sized commands.

Similar to the definition of command packet, fields in bold represents fields that are always present..

Table 5-3 Response Packet Format
FieldSize (bytes)Description
Header1See Table 5-4 table below
Length2 or 0 (Optional as per Data Length Preset field in the header)

Length of the command data in bytes following this byte. The checksum is not included in length.

For example, when the length is set as 10 means there are 10 bytes of data after this length field. LSB of length shall be sent first followed by MSB.

Data0-511 (total of max 512 bytes in the whole message including header and checksum)Response data bytes depend on the command code. If error bit in the header is set, there will only be a single data byte. This byte will indicate the error code that caused the command to nack. The error code definitions are listed in the Table 5-5 table below.
Checksum1 or 0 (optional as per Checksum Present field of header byte) Checksum of all bytes in the message including header bytes (Fletcher's checksum)

Table 5-4 Response Header Byte
BitsField NameValues
0:2DestinationNumerical destination code of the applicable command.
3ReservedN/A
4Datalength Present1 = Length field present in the extended header

0 = No length field

5Checksum Present1 = Checksum present after data bytes

0 = Checksum not present

6Error1 = Error. First data byte will have the error code that gives more information about the failure

0 = No error

7Busy

1 = System busy/response not ready

0 = Response ready

Applicable only for I2C based communication

Table 5-5 Error Code Definitions
Error CodeMeaning
1Invalid destination
2Invalid/Unknown command
3Invalid length
4Allocated buffer is not enough to store a command
5Length information missing for a variable sized command
6Checksum mismatch
7Timeout error
8Read not supported
9Write not supported
10Execution failed
11Invalid response length
12Buffer Full

An example of a response packet for Read LED Enable (see Section 9.6.2) can be seen below:

Figure 5-2 Response Packet Example
DLPC8445