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HDMI

HDMI

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HDMI

  1. 1. High Definition Multimedia Interface (HDMI)
  2. 2. Agenda • • • • • • • Introduction Block Diagram Encoder/Decoder Requirements Control Values Pixel Encodings Applications 3/7/2014 Department of ECE, JNTUHCEH 2/20
  3. 3. History 3/7/2014 Department of ECE, JNTUHCEH 3/20
  4. 4. Introduction  HDMI stands for ‘High Definition Multimedia Interface’  Transmitting DTV audio-visual signals from audio-visual sources to Television sets, Projectors and other video displays  Carry high quality multi-channel audio data  All standard and high definition consumer electronics video formats  Content Protection Technology is made available by the use of HDCP (High-bandwidth Digital Content Protection) system  Also carry control, status and data information in both directions  Video and Audio data is transmitted based on the TMDS (Transition Minimized Differential Signaling) Protocol  Plug & Play through Hot-Plug detection 3/7/2014 Department of ECE, JNTUHCEH 4/20
  5. 5. Block Diagram 3/7/2014 Department of ECE, JNTUHCEH 5/20
  6. 6. Connector Pin Assignments 3/7/2014 Department of ECE, JNTUHCEH 6/20
  7. 7. HDMI Encoder/Decoder 3/7/2014 Department of ECE, JNTUHCEH 7/20
  8. 8. Operating Modes The HDMI Link Operates in one of the three modes.  Video Data Period:  Active Pixels of an Active Video line are transmitted.  Data Island Period:  Audio and Auxiliary Data are transmitted using a series of packets.  Control Period:  Transmitted between any two periods that are not control periods  Provides information about the next data period. 3/7/2014 Department of ECE, JNTUHCEH 8/20
  9. 9. Encoding Type and Data Transmitted 3/7/2014 Department of ECE, JNTUHCEH 9/20
  10. 10. Operating Modes/TMDS Periods and Encoding 3/7/2014 Department of ECE, JNTUHCEH 10/20
  11. 11. Control Values  Data Island Leading & Trailing guard band values: TMDS Channel-0 : n.a., TMDS Channel-1 : 0b0100110011. TMDS Channel-2 : 0b0100110011.  Video Data Leading guard band values: TMDS Channel-0 : 0b1011001100. TMDS Channel-1 : 0b0100110011. TMDS Channel-2 : 0b1011001100.  Preambles for each data period type: 3/7/2014 Department of ECE, JNTUHCEH 11/20
  12. 12. Requirements  Video Requirements : • The video pixels carried across the link shall be in one of the following two different pixel encodings: 1. RGB 4:4:4. 2. YCbCr 4:4:4.  Color depth Requirements : • HDMI sources/sinks may support color depths 24, 30, 36 and/or 48 bits/pixel. • All HDMI sources/sinks should support 24 bits/pixel. 3/7/2014 Department of ECE, JNTUHCEH 12/20
  13. 13. Pixel Encodings(1)  RGB 4:4:4, 8bits/component 3/7/2014 Department of ECE, JNTUHCEH 13/20
  14. 14. Pixel Encodings(2)  YCbCr 4:4:4, 8bits/component 3/7/2014 Department of ECE, JNTUHCEH 14/20
  15. 15. Deep Color Pixel Packing  Relationship between the TMDS clock and pixel clock in deep-color is, The number of pixels and fragments per pixel group in deep-color is, 3/7/2014 Department of ECE, JNTUHCEH 15/20
  16. 16. Different Packet Types 3/7/2014 Department of ECE, JNTUHCEH 16/20
  17. 17. Example (TMDS Periods in 720x480p video frame) 3/7/2014 Department of ECE, JNTUHCEH 17/20
  18. 18. Applications • Personal Computers • Blu-ray Disc and HD DVD players • Digital cameras and camcorders • Tablet computers • Mobile Phones 3/7/2014 Department of ECE, JNTUHCEH 18/20
  19. 19. References • High-Definition Multimedia Interface Specification Version 1.3a • http://en.wikipedia.org/wiki/ • http://www.google.co.in • http://indieranch.com/Overview/RGB_4_4_4_overview.html 3/7/2014 Department of ECE, JNTUHCEH 19/20
  20. 20. Thank You 3/7/2014 Department of ECE, JNTUHCEH 20/20

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