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All About HDMI

All About HDMI. Steve Lampen Multimedia Technology Manager Belden. What is HDMI?. High Definition Media Interface A transmission standard. Invented by seven CE companies Copy protection ‘handshake’. No recording devices. Won’t work “too well”. What is HDMI?. 19 conductors

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All About HDMI

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  1. All About HDMI Steve Lampen Multimedia Technology Manager Belden

  2. What is HDMI? • High Definition Media Interface • A transmission standard. • Invented by seven CE companies • Copy protection ‘handshake’. • No recording devices. • Won’t work “too well”.

  3. What is HDMI? • 19 conductors • 3 shielded twisted pairs: data • 1 shielded twisted pair: clock • 100Ω±15Ω • 1 wire for control • CEC (Consumer Electronics Control) • 2 wires for 2-way communication (DDC): • High-bandwidth Digital Content Protection (HDCP) • EDID reading • Handshaking • 1 wire for +5v (50mA) • 5 ground wires for • 1 wire for Hot Plug Detection • 1 wire reserved for future use

  4. Handshake • EDID and DDC • DDC • Display Data Channel (DDC2) • 2-way communication channel • EDID • Extended Display Identification Data • Read through the DDC • VESA standard • Video Electronics Standards Association • Manufacturer’s name • Product type • Phosphor or filter type • Timings supported by the display • Display size • Luminance data • Pixel mapping data.

  5. Cable Construction

  6. HDMI Connector Big, heavy, and non-locking. Nineteen pins in a tiny connector!

  7. Bandwidth & Data Rate • Category 1 -720p/1080i • 74.25 MHz clock • 742.5 Mbps • 148.5 MHz clock • 1.485 Gbps • Category 2 – 1080p • 165 MHz clock • 1.65 Gbps per pair • 340 MHz clock "equalized". • 3.4 Gbps per pair • 10.2 Gbps payload

  8. Testing & Limitations • Anything works if it is short enough. • Cable tends to be big. • Gage sizes… • 22 AWG, rare, the biggest • 24 AWG, very common, big • 26 AWG, common • 28 AWG, smaller, short runs • 30 AWG, rare, very short runs

  9. Test Results

  10. Test Results

  11. Eye Pattern Requirements

  12. Category 1 – 74.25 MHz

  13. Category 2 – 165 MHz

  14. Category 2 – 340 MHz w/EQ

  15. Eye Patterns at 50 ft. 720p Belden Cable Chinese Cable

  16. Eye Patterns at 50 ft. 1080p Belden Cable Chinese Cable

  17. Construction Options • Bonded pairs • Belden patent • Improved impedance stability • Improved return loss • Improved inter-pair skew • Dramatically improved intra-pair skew

  18. Active HDMI • Active reclocking, EQ’ing • Dramatic increase in distance • ~150 ft. • Usually uses same HDMI cable with boxes • Belden and Gennum joint venture • 100 meters (328 ft.) HDMI • 1080p/60 • “Secret” cable construction

  19. Further Considerations • Exactly what do eye patterns tell us? • Effect of attenuation (AWG) • Effect of crosstalk • Effect of jitter • Effect of return loss (impedance variations) • We could do this all on one coax! • The cost of eye-pattern test gear • Display Port • Many thanks to HDMI Licensing (www.hdmi.org) and www.bluejeanscable.com

  20. WWW.BELDEN.COM 6,000 pages 1,000,000+ hits per week Samples: 1-800-235-3361 shlampen@aol.com

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