Enhanced-Extended Display Identification Data Configuration - Analog Devices Advantiv ADV7604 Hardware Manual

7.3

Enhanced-Extended Display Identification Data Configuration

The ADV7604 features a RAM that can store E-EDID. This internal EDID feature can be used for
the four HDMI ports A, B, C, and D. It is also possible to use an external device storage for the
E-EDID data on each port, or a combination of internal EDID for some port(s) and external storage
for the other port(s).
The following controls are provided to enable the internal E-EDID for each of the four HDMI ports.
EDID_A_ENABLE, Internal E-EDID for Port A Enable, Repeater Map, Address 0x77, [0]
Function
EDID_A_ENABLE
0
1
EDID_B_ENABLE, Internal E-EDID for Port B Enable, Repeater Map, Address 0x77, [1]
Function
EDID_B_ENABLE
0
1
EDID_C_ENABLE, Internal E-EDID for Port C Enable, Repeater Map, Address 0x77, [2]
Function
EDID_C_ENABLE
0
1
EDID_D_ENABLE, Internal E-EDID for Port D Enable, Repeater Map, Address 0x77, [3]
Function
EDID_D_ENABLE
0
1
When the internal E-EDID is enabled on any of the four ports (e.g. port A by setting
EDID_A_ENABLE to 1), the ADV7604 must first calculate the E-EDID checksums for that port
before the E-EDID is actually enabled.
The following read only flags can be utilized to determine if the E-EDID is actually enabled on any
of the four HDMI ports.
EDID_A_ENABLE_CPU, Internal E-EDID for Port A Flag, Repeater Map, Address 0x7D, [0]
Function
EDID_A_ENABLE_CPU
0
1
Rev. F August 2010
Description
Disables internal E-EDID for port A
Enables internal E-EDID for port A
Description
Disables internal E-EDID for port B
Enables internal E-EDID for port B
Description
Disables internal E-EDID for port C
Enables internal E-EDID for port C
Description
Disables internal E-EDID for port D
Enables internal E-EDID for port D
Description
Internal E-EDID for port A disabled
Internal E-EDID for port A enabled
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ADV7604