Transitioning Of Power Modes; Structure Of Internal E-Edid - Analog Devices ADV7610 Hardware User's Manual

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Notes
•
If the internal E-EDID RAM is enabled, an external E-EDID storage device must not be connected on the DDC bus of that port.
•
The internal E-EDID can be read by current address read sequences on the DDC port.
•
The ADV7610 supports the segment pointer, which is set at Register Address 0x60 through the DDC bus, and used in combination
with the internal E-EDID address (0xA0) to access the internal E-EDID.
•
The contents of the EDID RAM are not to be trusted after power-up or hardware reset. Users should write the proper contents to the
EDID RAM memory inside the
E-EDID Support for Power-Down Modes
The ADV7610 supports E-EDID access in Power-Down Mode 0 and Power-Down Mode 1. Using this feature, an application that
integrates the ADV7610 in standby can make its E-EDID available to the HDMI transmitter. This allows support of CEC and provides
compatibility with HDMI transmitters that require the E-EDID to be available when the HDMI receiver is powered down.
In Power-Down Mode 0, the part operates in a very low power state with only the minimum of internal circuitry enabled for the
internal E-EDID.
For more details on E-EDID accessibility in power-down modes, refer to the Power-Down Modes section.

TRANSITIONING OF POWER MODES

If the part starts in Power-Down Mode 0 and then transitions into a different power mode (that is, Power-Down Mode 1 or normal
operation mode), the information in the internal E-EDID is not overwritten. The internal E-EDID remains active on the HDMI port for
which the E-EDID has been accessed. This prevents disturbing E-EDID read requests from HDMI sources connected to the
while it is being powered on, or while the power mode is transitioning.
It is possible to disable the automatic enable of internal EDID on the HDMI port when the part comes out of power-down mode, by
setting the DISABLE_AUTO_EDID bit.
DISABLE_AUTO_EDID, Addr 64 (Repeater), Address 0x7A[1]
Disables all automatic enables for internal E-EDID.
Function
DISABLE_AUTO_EDID Description
0 (default) Automatic enable of internal E-EDID on HDMI port when the part comes out of Power-Down Mode 0
1 Disable automatic enable of internal E-EDID on HDMI port when the part comes out of Power-Down Mode 0

STRUCTURE OF INTERNAL E-EDID

This section describes the structure of the internal E-EDID accessible through the DDC bus. This section describes the structure
and configuration for of the internal E-EDID accessed through Port A. The internal E-EDID is enabled for Port A by setting the
EDID_A_ENABLE bit to 1.
The structure of the internal E-EDID image for Port A is shown in Figure 4.
ADV7610 via an external MCU.
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Hardware User Guide
ADV7610