ADV7170/ADV7171
MR17
MR16
MR15
MR14
MR13
MR12
MR11
MR10
DAC A
CONTROL
DAC D
CONTROL
CLOSED CAPTIONING
FIELD SELECTION
MR16
MR14
MR12 MR11
0
1
NORMAL
POWER-DOWN
0
1
NORMAL
POWER-DOWN
0
0
1
1
0
1
0
1
NO DATA OUT
ODD FIELD ONLY
EVEN FIELD ONLY
DATA OUT
(BOTH FIELDS)
COLOR BAR
CONTROL
DAC B
CONTROL
DAC C
CONTROL
INTERLACE
CONTROL
MR17
MR15
MR13
MR10
0
1
NORMAL
POWER-DOWN
0
1
NORMAL
POWER-DOWN
0
1
INTERLACED
NONINTERLACED
0
1
DISABLE
ENABLE
Figure 39. Mode Register 1
MR27
MR26
MR25
MR24
MR23
MR22
MR21
MR20
CHROMINANCE
CONTROL
GENLOCK CONTROL
MR22 MR21
LOW POWER MODE
MR26
MR24
x
0
0
1
DISABLE GENLOCK
ENABLE SUBCARRIER
RESET PIN
0
1
DISABLE
ENABLE
0
1
ENABLE COLOR
DISABLE COLOR
1
1
ENABLE RTC PIN
MR27
RESERVED
BURST
CONTROL
ACTIVE VIDEO LINE
DURATION
SQUARE PIXEL
CONTROL
MR25
MR23
MR20
0
1
ENABLE BURST
DISABLE BURST
0
1
DISABLE
ENABLE
0
1
720 PIXELS
710 PIXELS/702 PIXELS
Figure 40. Mode Register 2
MR37
MR36
MR35
MR34
MR33
MR32
MR31
MR30
VBI_OPEN
TTXRQ BIT
CHROMA OUTPUT
SELECT
MR30
MR31
MODE CONTROL
MR32
MR36
MR34
0
1
DISABLE
ENABLE
RESERVED
0
1
NORMAL
BIT REQUEST
0
1
DISABLE
ENABLE
INPUT DEFAULT
COLOR
TELETEXT
ENABLE
DAC OUTPUT
DAC B
MR37
MR35
MR33
DAC A
DAC C
DAC D
0
1
DISABLE
ENABLE
0
1
DISABLE
ENABLE
0
1
COMPOSITE
BLUE/COMP/U RED/CHROMA/V GREEN/LUMA/Y
GREEN/LUMA/Y BLUE/COMP/U RED/CHROMA/V COMPOSITE
Figure 41. Mode Register 3
a 1 selects ITU-R.BT470 standard for active video duration
(710 pixels NTSC; 702 pixels PAL).
Genlock Control (MR22 to MR21)
These bits control the genlock feature of the ADV7170/
ADV7171. Setting MR21 to a Logic Level 1 configures the
SCRESET/RTC pin as an input. Setting MR22 to Logic Level 0
configures the SCRESET/RTC pin as a subcarrier reset input.
Therefore, the subcarrier resets to Field 0 following a low-to-
high transition on the SCRESET/RTC pin. Setting MR22 to
Logic Level 1 configures the SCRESET/RTC pin as a real-time
control input.
Chrominance Control (MR24)
This bit enables the color information to be switched on and off
the video output.
Burst Control (MR25)
This bit enables the burst information to be switched on and off the
video output.
Low Power Mode (MR26)
Active Video Line Duration (MR23)
This bit enables the lower power mode of the ADV7170/
ADV7171, reducing the DAC current by 45ꢀ.
This bit switches between two active video line durations.
A 0 selects CCIR REC601 (720 pixels PAL/NTSC), and
Rev. C | Page 31 of 64
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