Analog Devices ADV7850 Hardware Manual page 35

• Non simultaneous mode
In this mode, the ADV7850 processes either analog or HDMI/DVI inputs. The HDMI section is disabled when the ADV7850 is
configured to process analog inputs. The ADCs are powered down when the part is configured to process HDMI/DVI inputs in
HDMI mode.
Notes:
• Simultaneous mode has no effect when the part is programmed in HDMI mode as the full HDMI section is enabled in this
mode
•
The ADCs are powered down automatically in HDMI mode, with the exception of simultaneous CVBS and HDMI audio mode,
as mentioned previously
• The following HDMI subsections are active and functional when the ADV7850 runs in simultaneous mode:
TMDS equalizer (refer to Section

TMDS clock detection circuitry (refer to Section 7.16)

TMDS clock measurement circuitry (refer to Section 7.17)

HDCP decryption engine (refer to Section 7.21)

HDMI synchronization filters (refer to Section 7.24)

InfoFrame and packet extraction processor (refer to Section 7.34)

• The following HDMI subsections are active and functional irrespective of the simultaneous mode:
5 V deglitch filter and detection circuitry (refer to Section 7.1)

E-EDID/Repeater controller (refer to Section 7.4)

adc_hdmi_simult_mode, IO, Address 0x01[7]
This control is used to enable ADC and HDMI simultaneous mode. In this mode, certain HDMI functionality is available when
processing analog inputs.
Function
adc_hdmi_simult_mode
0 
1
hdcp_only_mode, Addr 68 (HDMI), Address 0x00[6]
This control is used to configure a HDCP only mode for simultaneous analog and HDMI modes. Refer to the
adc_hdmi_simultaneous_mode bit. By selecting HDCP only mode, HDMI activity is reduced and it can be used as a power saving
feature in simultaneous analog and HDMI operation.
Function
hdcp_only_mode
0 
1
Rev. A May 2012
7.13 )
Description
Disable simultaneous mode
Enable simultaneous mode
Description
Normal operation
HDCP only mode
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ADV7850