Procedures For Monitoring The Ddc With The Auxiliary Channel Analyzer On Hdmi Sink Devices - Teledyne Lecroy 780 User Manual

780/780AH Handheld Test Instrument – User Guide
8.1.2

Procedures for monitoring the DDC with the Auxiliary Channel Analyzer on HDMI Sink Devices

This subsection provides procedures for ACA monitoring of HDMI sink devices, with or without a repeater while
the 780/780AH is emulating an HDMI source device.
Table 8-1 below describes each field in the Auxiliary Channel Analyzer on-screen transactions.
Table 8-1: Auxiliary Channel Analyzer record description
Data type
Hot Plug indication
+5V
EDID Exchange
HDCP Transactions
CEC messages
Errors
Note: You will have to obtain a license key for the ACA option to use the feature.
1. Connect the HDMI system devices to the 780/780AH in either of the ways shown in the diagrams above
and described as follows:
a. The HDMI sink device input is connected the 780/780AH HDMI OUT connector.
November 17, 2016
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Description
An indication from the HDMI sink to the HDMI source
that there is a device connected. The Hot Plug
voltage is a steady. In the case of a repeater, it is a
100ms pulse.
A voltage from an HDMI source to the HDMI sink to
power the hot plug voltage. The +5V is a steady
voltage nominally 5 volts.
A data set in the HDMI sink that describes its
capabilities to a connected source device. This data is
transmitted over the DDC channel.
Content protection authentication and encryption
transactions. The source initiates HDCP for protected
content. Various values and registers are exchanged
over the DDC.
CEC messages are transmitted over a one wire CEC
bus. These messages are monitored through the ACA
The DDC channel uses the I2C protocol. Errors in the
I2C protocol are shown in the ACA transactions.
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