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ac6 >> ac6-training >> Communication >> Connectivity >> HDMI 1.4a Download Catalog Download as PDF Write us Printable version

IM1 HDMI 1.4a

This course covers the HDMI multimedia interface

  • The course describes the architecture of a HDMI source-cable-sink system.
  • An introduction to Video and Audio standards is done prior to clarifying how this standards are transported through HDMI.
  • The analog interface is studied in detail, particularly the TMDS specification.
  • The course clarifies information coding / decoding schemes.
  • Content protection mechanisms are explained.
  • Ethernet connectivity and audio return channel are also covered.

  • This course has been delivered to several companies developing mobile phone chipsets.
A more detailed course description is available on request at
  • Experience of a digital bus is recommended.

First day
  • Digital link between audio / video source and display or video-projector
  • Pinout, source and sink requirements
  • Status exchange through VESA DDC channel
  • Optional HDMI Ethernet and Audio Return Channel (HEAC)
  • Content protection technology
  • Compatibility with Digital Visual Interface [DVI], adapter
  • Mechanical specification, connectors Type A, B, C, D and E
  • Dual link capability
  • Maximum possible bit rates
  • TMDS character time definition
  • Single-ended differential signal, definition of the swing
  • Sink clock recovery
  • Line termination and equalization
  • Source pre-emphasis
  • Source and sink TMDS characteristics, eye diagrams
  • I2C and CEC signal requirements
  • Interface testing (compliance checklist)
  • Lecroy QualiPHY HDMI test solution
  • HEAC physical layer, MLT-3 signaling
  • Simultaneous transmitting ARC and MLT-3 100BASE-TX signals
  • Differential mode and common mode transmission characteristics
  • Clock channel, pixel rate
  • Encoder mux
  • Leading and trailing guard bands and preamble
  • TERC4 data coding scheme
  • Video data coding
  • Purpose of auxiliary data
  • Error correction
  • Packet formats
  • Video standard basics, SDTV, EDTV, HDTV
  • 3D video format structure
  • 3D transmission video formats
  • Video data coding 24, 30, 36 or 48 bits
  • Video control signals HSYNC, VSYNC
  • Video data decoding
  • Video format timing specification
  • Color depth requirements
  • Gamut-related metadata
Second day
  • Audio basics, L-PCM coding, IEC standards
  • Audio sample clock capture and regeneration, N and CTS parameters
  • Using a CEC feedback channel to adjust the clock in the Source device
  • Audio, video synchronization
  • Audio data packetization
  • DST usage
  • HEAC audio return channel
  • I2C basics
  • The Display Data Channel [DDC] usage during configuration
  • VESA enhanced display data channel standard
  • Physical address discovery algorithm
  • AVI info frame
  • Audio info frame
  • E-EDID data structure
  • CEA extension
  • HDMI vendor-specific data block
  • DVI / HDMI device discrimination
  • Consumer Electronic Control
  • CEC command description, remote control, AV-link protocol
  • HEAC capability discovery and control
  • CDC arbitration
  • Channel states and transitions
  • Activation of an HDMI channel
  • HEC control for adjacent devices
  • Message description
  • Networking using 100BASE-TX
  • Connection to internet via home network
  • Switching, loop detection and removal
  • HDCP specification (DRM)
  • Authentication of devices
  • Computation of shared key
  • Multimedia contents encryption
  • HDCP over HDMI
  • ACP packets