E-Edid/Repeater Controller; E-Edid Data Configuration - Analog Devices ADV7610 Hardware User's Manual

Hardware User Guide
HPA_OVR_TERM, Addr 68 (HDMI), Address 0x6C[3]
A control to set the termination control to be overridden by the HPA setting. When this bit is set, termination on a specific port is set
according to the HPA status of that port.
Function
HPA_OVR_TERM
0 (default)
1

E-EDID/REPEATER CONTROLLER

The HDMI section incorporates an E-EDID/repeater controller, which performs the following tasks:
•
Computes the E-EDID checksum
•
Performs the repeater routines described in the Repeater Support section
The E-EDID/repeater controller is powered from the DVDD supply and clocked by an internal ring oscillator. The controller and the
internal DDC bus arbiter are kept active in power-down Mode 0 and power-down Mode 1. This allows the internal E-EDID to be
functional and accessible through the DDC port, even when the part is powered down (refer to the Power-Down Modes section).
These HDMI transmitters can then read the capabilities of the powered-down application integrating the
internal E-EDID through the DDC ports.
The E-EDID/repeater controller is reset when the DVDD supplies go low or when
E-EDID/repeater controller reboots, it performs the following tasks:
•
Clears the internal E-EDID and Key Selection Vector (KSV) RAM (refer to E-EDID Data Configuration section and the Internal
HDCP Key OTP ROM section )
•
Computes a checksum for port
HDCP_REPT_EDID_RESET, Addr 68 (HDMI), Address 0x5A[3] (Self-Clearing)
A reset control for the E-EDID/repeater controller. When asserted, it resets the E-EDID/repeater controller.
Function
HDCP_REPT_EDID_RESET
0 (default)
1

E-EDID DATA CONFIGURATION

The ADV7610 features a RAM that can store an E-EDID. This internal E-EDID feature can be used for the HDMI port. It is also possible
to use an external device storage for the E-EDID data.
The following controls are provided to enable the internal E-EDID for each of the four HDMI ports.
EDID_A_ENABLE, Addr 64 (Repeater), Address 0x74[0]
Enables I 2 C access to the internal EDID RAM from DDC Port A.
Function
EDID_A_ENABLE
0 (default)
1
When the internal E-EDID is enabled, the
actually enabled.
The following read only flags can be utilized to determine if the E-EDID is actually enabled on the HDMI ports.
EDID_A_ENABLE_CPU, Addr 64 (Repeater), Address 0x76[0] (Read Only)
Flags internal EDID enabling on Port A.
Function
EDID_A_ENABLE_CPU
0 (default)
1
Description
Automatic or manual I
Termination controls disabled and overridden by HPA controls
Description
Normal operation
Resets the E-EDID/repeater controller
Description
Disables E-EDID for Port A
Enables E-EDID for Port A
ADV7610 must first calculate the E-EDID checksums for that port before the E-EDID is
Description
Disabled
Enabled
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2 C control of port termination
ADV7610
HDCP_REPT_EDID_RESET
UG-438
by accessing its
is set high. When the