HDMI

1. High Definition Multimedia Interface (HDMI)

2. Agenda
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Introduction
Block Diagram
Encoder/Decoder
Requirements
Control Values
Pixel Encodings
Applications
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3. History
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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
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5. Block Diagram
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6. Connector Pin Assignments
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7. HDMI Encoder/Decoder
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8. Operating Modes
The HDMI Link Operates in one of the three modes.
 Video Data Period:
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Active Pixels of an Active Video line are transmitted.
 Data Island Period:
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Audio and Auxiliary Data are transmitted using a series of packets.
 Control Period:
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Transmitted between any two periods that are not control periods
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Provides information about the next data period.
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9. Encoding Type and Data Transmitted
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10. Operating Modes/TMDS Periods and
Encoding
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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:
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12. Requirements

Video Requirements :
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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 :
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HDMI sources/sinks may support color depths 24, 30, 36 and/or 48 bits/pixel.
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All HDMI sources/sinks should support 24 bits/pixel.
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13. Pixel Encodings(1)
 RGB 4:4:4, 8bits/component
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14. Pixel Encodings(2)
 YCbCr 4:4:4, 8bits/component
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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,
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16. Different Packet Types
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17. Example (TMDS Periods in 720x480p video frame)
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18. Applications
• Personal Computers
• Blu-ray Disc and HD DVD players
• Digital cameras and camcorders
• Tablet computers
• Mobile Phones
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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
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20. Thank You
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