Analog Devices Advantiv ADV7611 Hardware User's Manual page 136

UG-180
Field line count is the vertical parameter that holds the ideal number of lines per field for a given video standard. It affects the way CP
handles the unlocked state. It affects the way CP handles the unlocked state. If
free run line length value is decoded from the current setting of PRIM_MODE[3:0] and VID_STD[5:0].
For standards not covered by the preprogrammed values, the
the ideally expected number of lines per field.
Notes
•
The CP_LCOUNT_MAX[11:0] parameter has no effect on the video decoding.
•
If CP_LCOUNT_MAX[11:0] is not programmed, then the Free-run Line Length parameter is decoded from
VID_STD[5:0].
•
If CP_LCOUNT_MAX[11:0] is programmed, then Free-run Line Length parameter defined by CP_LCOUNT_MAX[11:0] and
INTERLACED, is used for Channel 1.
LCOUNT_MAX BASED
Free Run Feature in HDMI Mode
This section describes how to configure the free run feature when the ADV7611 is in HDMI mode. The ADV7611 HDMI mode is
defined in the Primary Mode and Video Standard section.
There are two free run modes in HDMI: Free Run Mode 0 and Free Run Mode 1. The HDMI_FRUN_MODE control selects which free
run mode is enabled.
•
HDMI Free Run Mode 0:
The decoder enters free run when the TMDS clock is not detected, for example, in a cable disconnect situation.
•
HDMI Free Run Mode 1:
The decoder enters free run when the TMDS clock is not detected or when the detected input format does not match the format
dictated by the PRIM_MODE[3:0]
For either free run mode to be implemented, HDMI free run operation must be enabled. This is done via the HDMI_FRUN_EN control.
HDMI_FRUN_EN , Addr 44 (CP), Address 0xBA[0]
A control to enable free run in HDMI mode.
Function
HDMI_FRUN_EN
0
1 (default)
HDMI_FRUN_MODE , Addr 44 (CP), Address 0xBA[1]
A control to configure the free run feature in HDMI mode.
Function
HDMI_FRUN_MODE
0 (default)
1
CP_LCOUNT_MAX[11:0] == 12'D0
CP_LCOUNT_MAX[11:0]
0
1
ON PM/VS
Figure 57. Free Run Field Length Selection for Channel 1 and Channel 2
and VID_STD[5:0]
Description
Disable the free run feature in HDMI mode
Enable the free run feature in HDMI mode
Description
HDMI free run Mode 0. The part free runs when the TMDS clock is not detected on the selected HDMI port.
HDMI free run Mode 1. The CP core free runs when the TMDS clock is not detected on the selected HDMI port
or it the video resolution of HDMI stream processed by the part does not match the video resolution
programmed in PRIM_MODE[3:0] and VID_STD[5:0].
CP_LCOUNT_MAX[11:0]
CP_LCOUNT_MAX[11:0]
INTERLACED
[11:1]
[10:0]
[11:0]
1
0
[10:0]
settings.
Rev. A | Page 136 of 184
Hardware User Guide
is set to 0, the internally used
and INTERLACED parameters must be set to
PRIM_MODE[3:0]
FR_FIELD_LENGTH USED
ON SYNC CHANNEL 1
and