Analog Devices Advantiv ADV7619 Hardware User's Manual page 34

UG-237
EDID_A_ENABLE, Addr 64 (Repeater), Address 0x74[0]
2
Enables I C access to the internal EDID RAM from DDC Port A.
Function
EDID_A_ENABLE
0 (default)
1
EDID_B_ENABLE, Addr 64 (Repeater), Address 0x74[1]
2
Enables I C access to the internal EDID RAM from DDC Port B.
Function
EDID_B_ENABLE
0 (default)
1
When the internal E-EDID is enabled on either port, the ADV7619 must first calculate the E-EDID checksums for that port before the E-
EDID is actually enabled.
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
EDID_B_ENABLE_CPU, Addr 64 (Repeater), Address 0x76[1] (Read Only)
Flags internal EDID enabling on Port B.
Function
EDID_B_ENABLE_CPU
0 (default)
1
Notes
•
When the internal E-EDID is enabled on more than one port (such as Port A and Port B), the corresponding enable controls (such as
EDID_A_ENABLE and EDID_B_ENABLE) should be set high in one single I
checksums.
•
If the internal E-EDID RAM is enabled for one specific port (such as Port A), 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 ADV7619 supports the segment pointer, which is set at device 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. User should write proper contents to the
EDID RAM memory inside the ADV7619 via an external MCU.
E-EDID Support for Power-Down Modes
The ADV7619 supports E-EDID access in Power-Down Mode 0 and Power-Down Mode 1. Using this feature, an application that
integrates the ADV7619 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.
Description
Disables E-EDID for Port A
Enables E-EDID for Port A
Description
Disables E-EDID for Port B
Enables E-EDID for Port B
Description
Disabled
Enabled
Description
Disabled
Enabled
2
C write. This ensures the fastest calculation of the
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Hardware User Guide