AD ADV7181B Multiformat sdtv video decoder Datasheet

Multiformat SDTV Video Decoder
ADV7181B
FEATURES
Integrates three 54 MHz, 9-bit ADCs
Clocked from a single 27 MHz crystal
Line-locked clock-compatible (LLC)
Adaptive Digital Line Length Tracking (ADLLT™),
signal processing, and enhanced FIFO management
give mini-TBC functionality
5-line adaptive comb filters
Proprietary architecture for locking to weak, noisy, and
unstable video sources such as VCRs and tuners
Subcarrier frequency lock and status information output
Integrated AGC with adaptive peak white mode
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Macrovision® copy protection detection
Chroma transient improvement (CTI)
Digital noise reduction (DNR)
Multiple programmable analog input formats
Composite video (CVBS)
S-Video (Y/C)
YPrPb component (VESA, MII, SMPTE, and BetaCam)
6 analog video input channels
Automatic NTSC/PAL/SECAM identification
Digital output formats (8-bit or16-bit)
ITU-R BT.656 YCrCb 4:2:2 output + HS, VS, and FIELD
0.5 V to 1.6 V analog signal input range
Differential gain: 0.6% typ
Differential phase: 0.6° typ
Programmable video controls
Peak white/hue/brightness/saturation/contrast
Integrated on-chip video timing generator
Free-run mode (generates stable video output with no I/P)
VBI decode support for
close captioning, WSS, CGMS, EDTV, Gemstar® 1×/2×
VBI decode support for
close captioning, WSS, CGMS, EDTV, and
Gemstar® 1×/2×
Power-down mode
2-wire serial MPU interface (I2C®-compatible)
3.3 V analog, 1.8 V digital core; 3.3 V IO supply
Temperature grade: –40°C to +85°C
64-lead LQFP Pb-free package and 64-lead LFCSP package
TE
Multiformat video decoder supports NTSC-(M, J, 4.43),
PAL-(B/D/G/H/I/M/N), SECAM
APPLICATIONS
DVD recorders
PC video
HDD-based PVRs/DVDRs
LCD TVs
Set-top boxes
Security systems
Digital televisions
Portable video devices
Automotive entertainment
AVR receivers
GENERAL DESCRIPTION
O
The ADV7181B integrated video decoder automatically detects
and converts a standard analog baseband television signal
compatible with worldwide standards NTSC, PAL, and SECAM
into 4:2:2 component video data compatible with 16-bit/8-bit
CCIR601/CCIR656.
The advanced, highly flexible digital output interface enables
performance video decoding and conversion in line-locked
clock-based systems. This makes the device ideally suited for a
broad range of applications with diverse analog video characteristics, including tape-based sources, broadcast sources,
security/surveillance cameras, and professional systems.
The six analog input channels accept standard composite,
S-Video, and YPrPb video signals in an extensive number of
combinations. AGC and clamp restore circuitry allow an input
video signal peak-to-peak range of 0.5 V to 1.6 V. Alternatively,
these can be bypassed for manual settings.
The fixed 54 MHz clocking of the ADCs and datapath for all
modes allows very precise, accurate sampling and digital
filtering. The line-locked clock output allows the output data
rate, timing signals, and output clock signals to be synchronous,
asynchronous, or line-locked even with ±5% line length
variation. The output control signals allow glueless interface
connections in almost any application. The ADV7181B modes
are set up over a 2-wire, serial, bidirectional port (I2C-compatible).
The ADV7181B is fabricated in a 3.3 V CMOS process. Its
monolithic CMOS construction ensures greater functionality
with lower power dissipation.
The ADV7181B is available in two packages, a small 64-lead
LQFP Pb-free package and a 64-lead LFCSP package.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
ADV7181B
TABLE OF CONTENTS
General Setup.............................................................................. 20
Analog Front End ......................................................................... 4
Color Controls ............................................................................ 22
Standard Definition Processor ................................................... 4
Clamp Operation........................................................................ 24
Functional Block Diagram .............................................................. 5
Luma Filter .................................................................................. 25
Specifications..................................................................................... 6
Chroma Filter.............................................................................. 28
Electrical Characteristics............................................................. 6
Gain Operation........................................................................... 29
Video Specifications..................................................................... 7
Chroma Transient Improvement (CTI) .................................. 32
Timing Specifications .................................................................. 8
Digital Noise Reduction (DNR) ............................................... 33
Analog Specifications................................................................... 8
Comb Filters................................................................................ 33
Thermal Specifications ................................................................ 9
AV Code Insertion and Controls ............................................. 36
Timing Diagrams.......................................................................... 9
Synchronization Output Signals............................................... 38
Absolute Maximum Ratings.......................................................... 10
Sync Processing .......................................................................... 46
ESD Caution................................................................................ 10
VBI Data Decode ....................................................................... 46
Pin Configuration and Function Descriptions........................... 11
Pixel Port Configuration ............................................................... 59
Analog Front End ........................................................................... 13
MPU Port Description................................................................... 60
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Introduction ...................................................................................... 4
Register Accesses ........................................................................ 61
Global Control Registers ............................................................... 15
Register Programming............................................................... 61
Power-Save Modes...................................................................... 15
I2C Sequencer.............................................................................. 61
Reset Control .............................................................................. 15
I2C Register Maps ........................................................................... 62
Global Pin Control ..................................................................... 16
I2C Register Map Details ........................................................... 67
Global Status Registers................................................................... 18
I2C Programming Examples.......................................................... 88
Identification............................................................................... 18
Examples for 28 MHz Clock..................................................... 88
O
Analog Input Muxing ................................................................ 13
Status 1 ......................................................................................... 18
Examples for 27 MHz Clock..................................................... 92
Autodetection Result.................................................................. 18
PCB Layout Recommendations.................................................... 95
Status 2 ......................................................................................... 18
Analog Interface Inputs ............................................................. 95
Status 3 ......................................................................................... 18
Power Supply Decoupling ......................................................... 95
Standard Definition Processor (SDP).......................................... 19
PLL ............................................................................................... 95
SD Luma Path ............................................................................. 19
Digital Outputs (Both Data and Clocks) ................................ 95
SD Chroma Path......................................................................... 19
Digital Inputs .............................................................................. 96
Sync Processing........................................................................... 20
Antialiasing Filters ..................................................................... 96
VBI Data Recovery..................................................................... 20
Crystal Load Capacitor Value Selection.................................. 96
Rev. B | Page 2 of 100
ADV7181B
Typical Circuit Connection ...........................................................97
Ordering Guide .........................................................................100
Outline Dimensions........................................................................99
REVISION HISTORY
7/04—Revision 0: Initial Version
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7/05—Rev. 0 to Rev. A
Changed Crystal References to 28 MHz Crystal............ Universal
Changes to General Description Section .......................................1
Changes to Analog Specifications Section.....................................8
Changes to Clamp Operation Section ..........................................24
Changes to Figure 11 to Figure 14 ................................................28
Changes to Description of Chroma Filter....................................28
Changes to Figure 15 ......................................................................29
Changes to Luma Gain LAGC[2:0] Bits Address........................30
Changes to VSEHE VS End Horizontal Position Section..........39
Changes to Table 54 ........................................................................41
Changes to Table 55 ........................................................................42
Changes to Table 83 ........................................................................67
Changes to Table 84 ........................................................................71
Changes to Table 85 ........................................................................88
Changes to Table 86 ........................................................................89
Changes to Table 87 ........................................................................90
Changes to Table 88 ........................................................................91
Added XTAL Load Capacitor Value Selection Section..............96
Replaced Figure 45..........................................................................98
TE
9/05—Rev. A to Rev. B
Changes to Table 1 ............................................................................6
Changes to Table 2 ............................................................................7
Changes to Table 3 and Table 4 .......................................................8
Changes to Table 5 ............................................................................9
Changes to Figure 5.........................................................................13
Changes to Figure 7.........................................................................19
Changes to Lock Related Controls Section..................................21
Changes to Table References in BETACAM Section..................31
Changes to PAL Comb Filter Settings Section ............................34
Changes to Figure 20 ......................................................................40
Change to NFTOG Section............................................................43
Changes to Table 84 ........................................................................67
Changes to Table 85 ........................................................................72
Rev. B | Page 3 of 100
ADV7181B
INTRODUCTION
include PAL B/D/I/G/H, PAL60, PAL M, PAL N, PAL Nc,
NTSC M/J, NTSC 4.43, and SECAM B/D/G/K/L. The
ADV7181B can automatically detect the video standard and
process it accordingly.
The advanced and highly flexible digital output interface enables
performance video decoding and conversion in line-locked,
clock-based systems. This makes the device ideally suited for a
broad range of applications with diverse analog video characteristics, including tape-based sources, broadcast sources,
security/surveillance cameras, and professional systems.
The ADV7181B has a 5-line, superadaptive, 2D comb filter that
gives superior chrominance and luminance separation when
decoding a composite video signal. This highly adaptive filter
automatically adjusts its processing mode according to video
standards and signal quality with no user intervention required.
Video user controls, such as brightness, contrast, saturation,
and hue, are also available within the ADV7181B.
ANALOG FRONT END
The ADV7181B implements a patented ADLLT algorithm to
track varying video line lengths from sources such as a VCR.
ADLLT enables the ADV7181B to track and decode poor
quality video sources such as VCRs, noisy sources from tuner
outputs, VCD players, and camcorders. The ADV7181B
contains a chroma transient improvement (CTI) processor that
sharpens the edge rate of chroma transitions, resulting in
sharper vertical transitions.
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The ADV7181B analog front end comprises three 9-bit ADCs
that digitize the analog video signal before applying it to the
standard definition processor. The analog front end uses
differential channels to each ADC to ensure high performance
in mixed-signal applications.
TE
The ADV7181B is a high quality, single chip, multiformat video
decoder that automatically detects and converts PAL, NTSC,
and SECAM standards in the form of composite, S-Video, and
component video into a digital ITU-R BT.656 format.
The ADV7181B can process a variety of VBI data services such
as close captioning (CC), wide screen signaling (WSS), copy
generation management system (CGMS), EDTV, Gemstar
1×/2×, and extended data service (XDS). The ADV7181B is
fully Macrovision certified; detection circuitry enables Type I,
Type II, and Type III protection levels to be identified and
reported to the user. The decoder is also fully robust to all
Macrovision signal inputs.
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The front end also includes a 6-channel input mux that enables
multiple video signals to be applied to the ADV7181B. Current
and voltage clamps are positioned in front of each ADC to
ensure the video signal remains within the range of the
converter. Fine clamping of the video signals is performed
downstream by digital fine clamping within the ADV7181B.
The ADCs are configured to run in 4× oversampling mode.
STANDARD DEFINITION PROCESSOR
O
The ADV7181B is capable of decoding a large selection of
baseband video signals in composite, S-Video, and component
formats. The video standards supported by the ADV7181B
Rev. B | Page 4 of 100
6
04984-001
INPUT
MUX
SCLK
SDA
ALSB
CVBS
S-VIDEO
YPrPb
AIN1–
AIN6
A/D
CLAMP
9
9
9
Figure 1.
Rev. B | Page 5 of 100
CONTROL
AND DATA
ADV7181B
SYNC AND
CLK CONTROL
DECIMATION AND
DOWNSAMPLING
FILTERS
DATA
PREPROCESSOR
9
9
CHROMA
DIGITAL
FINE
CLAMP
MACROVISION
DETECTION
STANDARD
AUTODETECTION
GLOBAL CONTROL
GAIN
CONTROL
LINE
LENGTH
PREDICTOR
GAIN
CONTROL
CHROMA
2D COMB
(4H MAX)
CTI
C-DNR
AV
CODE
INSERTION
L-DNR
LUMA
2D COMB
(4H MAX)
FREE RUN
OUTPUT CONTROL
SYNTHESIZED
LLC CONTROL
CHROMA
RESAMPLE
RESAMPLE
CONTROL
LUMA
RESAMPLE
TE
CHROMA
FILTER
VBI DATA RECOVERY
CHROMA
DEMOD
LE
SYNC
EXTRACT
LUMA
FILTER
STANDARD DEFINITION PROCESSOR
FSC
RECOVERY
LUMA
DIGITAL
FINE
CLAMP
B
SO
SERIAL INTERFACE
CONTROL AND VBI DATA
SYNC PROCESSING AND
CLOCK GENERATION
A/D
A/D
CLAMP
CLAMP
O
16
8
8
INTRQ
SFL
LLC
FIELD
VS
HS
PIXEL
DATA
ADV7181B
FUNCTIONAL BLOCK DIAGRAM
OUTPUT FORMATTER
ADV7181B
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
AVDD = 3.15 V to 3.45 V, DVDD = 1.65 V to 2.0 V, DVDDIO = 3.0 V to 3.6 V, PVDD = 1.65 V to 2.0 V; operating temperature range, unless
otherwise noted.
Table 1.
Power-Down Current
Power-Up Time
1
Test Conditions
N
INL
DNL
BSL at 54 MHz
BSL at 54 MHz
Pin 29
All other pins
–50
–10
ISOURCE = 0.4 mA
ISINK = 3.2 mA
2.4
DVDD
DVDDIO
PVDD
AVDD
IDVDD
IDVDDIO
IPVDD
IAVDD
CVBS input 4
YPrPb input 5
IPWRDN
tPWRUP
O
Temperature range: TMIN to TMAX, –40°C to +85°C.
The min/max specifications are guaranteed over this range.
3
Guaranteed by characterization.
4
ADC1 and ADC2 powered down.
5
All three ADCs powered on.
2
Typ
Max
Unit
−0.475/+0.6
–0.25/+0.5
9
−1.5/+2
–0.7/+2
Bits
LSB
LSB
2
CIN
VOH
VOL
ILEAK
COUT
Min
0.8
+50
+10
10
V
V
μA
μA
pF
0.4
10
20
V
V
μA
pF
TE
VIH
VIL
IIN
B
SO
Input Capacitance
DIGITAL OUTPUTS
Output High Voltage
Output Low Voltage
High Impedance Leakage Current
Output Capacitance
POWER REQUIREMENTS 3
Digital Core Power Supply
Digital I/O Power Supply
PLL Power Supply
Analog Power Supply
Digital Core Supply Current
Digital I/O Supply Current
PLL Supply Current
Analog Supply Current
Symbol
LE
Parameter 1, 2
STATIC PERFORMANCE
Resolution (Each ADC)
Integral Nonlinearity
Differential Nonlinearity
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Current
Rev. B | Page 6 of 100
1.65
3.0
1.65
3.15
1.8
3.3
1.8
3.3
80
2
10.5
85
180
1.5
20
2
3.6
2.0
3.45
V
V
V
V
mA
mA
mA
mA
mA
mA
ms
ADV7181B
VIDEO SPECIFICATIONS
Guaranteed by characterization. AVDD = 3.15 V to 3.45 V, DVDD = 1.65 V to 2.0 V, DVDDIO = 3.0 V to 3.6 V, PVDD = 1.65 V to 2.0 V;
operating temperature range, unless otherwise noted.
Table 2.
1
DP
DG
LNL
Min
Max
Unit
CVBS I/P, modulate 5-step
CVBS I/P, modulate 5-step
CVBS I/P, 5-step
0.6
0.6
0.6
0.7
0.7
0.7
Degrees
%
%
Luma ramp
Luma flat field
54
58
60
TE
Typ
–5
40
+5
70
±1.3
60
20
5
CVBS, 1 V I/P
CVBS, 1 V I/P
Temperature range: TMIN to TMAX, –40°C to +85°C.
The min/max specifications are guaranteed over this range.
Rev. B | Page 7 of 100
200
200
2
100
HUE
CL_AC
O
2
Test Conditions
B
SO
Analog Front End Crosstalk
LOCK TIME SPECIFICATIONS
Horizontal Lock Range
Vertical Lock Range
FSC Subcarrier Lock Range
Color Lock In Time
Sync Depth Range
Color Burst Range
Vertical Lock Time
Autodetection Switch Speed
CHROMA SPECIFICATIONS
Hue Accuracy
Color Saturation Accuracy
Color AGC Range
Chroma Amplitude Error
Chroma Phase Error
Chroma Luma Intermodulation
LUMA SPECIFICATIONS
Luma Brightness Accuracy
Luma Contrast Accuracy
Symbol
LE
Parameter 1, 2
NONLINEAR SPECIFICATIONS
Differential Phase
Differential Gain
Luma Nonlinearity
NOISE SPECIFICATIONS
SNR Unweighted
1
1
dB
dB
dB
%
Hz
kHz
Lines
%
%
Fields
Lines
0.5
0.5
0.2
Degrees
%
%
%
Degrees
%
1
1
%
%
5
400
ADV7181B
TIMING SPECIFICATIONS
Guaranteed by characterization. AVDD = 3.15 V to 3.45 V, DVDD = 1.65 V to 2.0 V, DVDDIO = 3.0 V to 3.6 V, PVDD = 1.65 V to 2.0 V;
operating temperature range, unless otherwise noted.
Table 3.
1
Test Conditions
Min
Typ
Max
Unit
±50
MHz
ppm
27.00
400
0.6
1.3
0.6
0.6
100
TE
t1
t2
t3
t4
t5
t6
t7
t8
300
300
0.6
5
t9:t10
t11
t12
kHz
μs
μs
μs
μs
ns
ns
ns
μs
ms
45:55
Negative clock edge to start of
valid data (tACCESS = t10 – t11)
End of valid data to negative
clock edge (tHOLD = t9 + t12)
B
SO
Data Output Transitional Time
Symbol
LE
Parameter 1, 2
SYSTEM CLOCK AND CRYSTAL
Nominal Frequency
Frequency Stability
I2C PORT
SCLK Frequency
SCLK Min Pulse Width High
SCLK Min Pulse Width Low
Hold Time (Start Condition)
Setup Time (Start Condition)
SDA Setup Time
SCLK and SDA Rise Time
SCLK and SDA Fall Time
Setup Time for Stop Condition
RESET FEATURE
Reset Pulse Width
CLOCK OUTPUTS
LLC1 Mark Space Ratio
DATA AND CONTROL OUTPUTS
Data Output Transitional Time
55:45
% duty cycle
3.4
ns
2.4
ns
Temperature range: TMIN to TMAX, –40°C to +85°C.
The min/max specifications are guaranteed over this range.
2
ANALOG SPECIFICATIONS
Guaranteed by characterization. AVDD = 3.15 V to 3.45 V, DVDD = 1.65 V to 2.0 V, DVDDIO = 3.0 V to 3.6 V, PVDD = 1.65 V to 2.0 V;
operating temperature range, unless otherwise noted. Recommended analog input video signal range: 0.5 V to 1.6 V, typically 1 V p-p.
Table 4.
Symbol
O
Parameter 1, 2
CLAMP CIRCUITRY
External Clamp Capacitor
Input Impedance
Large Clamp Source Current
Large Clamp Sink Current
Fine Clamp Source Current
Fine Clamp Sink Current
Test Conditions
Clamps switched off
1
Temperature range: TMIN to TMAX, –40°C to +85°C
The min/max specifications are guaranteed over this range.
2
Rev. B | Page 8 of 100
Min
Typ
0.1
10
0.75
0.75
60
60
Max
Unit
μF
MΩ
mA
mA
μA
μA
ADV7181B
THERMAL SPECIFICATIONS
Table 5.
Parameter 1, 2
THERMAL CHARACTERISTICS
Junction-to-Ambient Thermal
Resistance (Still Air)
Junction-to-Case Thermal Resistance
Junction-to-Ambient Thermal
Resistance (Still Air)
Junction-to-Case Thermal Resistance
Symbol
Test Conditions
Min
θJA
4-layer PCB with solid ground plane, 64-lead LFCSP
45.5
°C/W
θJC
θJA
4-layer PCB with solid ground plane, 64-lead LFCSP
4-layer PCB with solid ground plane, 64-lead LQFP
9.2
47
°C/W
°C/W
θJC
4-layer PCB with solid ground plane, 64-lead LQFP
11.1
°C/W
1
Temperature range: TMIN to TMAX, –40°C to +85°C
The min/max specifications are guaranteed over this range.
TE
2
TIMING DIAGRAMS
SDA
t1
t6
t2
LE
SCLK
t4
t7
04984-002
t3
t5
t3
t8
Figure 2. I2C Timing
t9
t12
t11
OUTPUTS P0–P15, VS,
HS, FIELD,
SFL
O
Figure 3. Pixel Port and Control Output Timing
Rev. B | Page 9 of 100
04984-003
B
SO
OUTPUT LLC
t10
Typ
Max
Unit
ADV7181B
ABSOLUTE MAXIMUM RATINGS
Table 6.
–65°C to +150°C
260°C
ESD CAUTION
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
TE
Rating
4V
4V
2.2 V
2.2 V
4V
–0.3 V to +0.3 V
–0.3 V to +0.3 V
–0.3 V to +2 V
–0.3 V to +2 V
–0.3 V to +2 V
–0.3 V to +2 V
–0.3 V to DVDDIO +0.3 V
–0.3 V to DVDDIO +0.3 V
AGND – 0.3 V to AVDD + 0.3 V
150°C
LE
Parameter
AVDD to GND
AVDD to AGND
DVDD to DGND
PVDD to AGND
DVDDIO to DGND
DVDDIO to AVDD
PVDD to DVDD
DVDDIO – PVDD
DVDDIO – DVDD
AVDD – PVDD
AVDD – DVDD
Digital Inputs Voltage to DGND
Digital Output Voltage to DGND
Analog Inputs to AGND
Maximum Junction Temperature
(TJ max)
Storage Temperature Range
Infrared Reflow Soldering
(20 sec)
O
B
SO
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. B | Page 10 of 100
ADV7181B
FIELD
P12
P13
P14
P15
DVDD
DGND
NC
NC
SCLK
SDA
ALSB
RESET
NC
AIN6
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
AIN5
47
AIN4
DGND 3
46
AIN3
DVDDIO 4
45
AGND
P11 5
44
CAPC2
P10 6
43
AGND
P9 7
42
CML
41
REFOUT
40
AVDD
39
CAPY2
38
CAPY1
37
AGND
36
AIN2
35
AIN1
34
DGND
33
NC
1
DVDDIO 11
NC 12
NC 13
P7 14
P6 15
21
22
23
24
25
26
XTAL
DVDD
DGND
P1
P0
27
28
29
30
31
32
LE
20
XTAL1
P3
NC = NO CONNECT
19
LLC
18
P2
17
P4
P5 16
AGND
DGND 10
PVDD
TOP VIEW
(Not to Scale)
ELPF
SFL 9
PWRDN
ADV7181B
NC
P8 8
TE
PIN 1
INDICATOR
NC
HS 2
O
B
SO
Figure 4. 64-Lead LFCSP/LQFP Pin Configuration
Rev. B | Page 11 of 100
04984-004
INTRQ
VS
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADV7181B
Table 7. Pin Function Descriptions
Type
G
G
P
P
P
P
I
Description
Digital Ground.
Analog Ground.
Digital I/O Supply Voltage (3.3 V).
Digital Core Supply Voltage (1.8 V).
Analog Supply Voltage (3.3 V).
PLL Supply Voltage (1.8 V).
Analog Video Input Channels.
No Connect Pins.
P0 to P15
O
Video Pixel Output Port.
HS
VS
FIELD
INTRQ
O
O
O
O
53
54
52
SDA
SCLK
ALSB
I/O
I
I
51
RESET
I
20
LLC
O
22
XTAL
I
21
XTAL1
O
29
PWRDN
I
30
ELPF
I
9
SFL
O
41
REFOUT
O
Horizontal Synchronization Output Signal.
Vertical Synchronization Output Signal.
Field Synchronization Output Signal.
Interrupt Request Output. Interrupt occurs when certain signals are detected on the input
video. See the interrupt register map in Table 83.
I2C Port Serial Data Input/Output Pin.
I2C Port Serial Clock Input. Maximum clock rate of 400 kHz.
This pin selects the I2C address for the ADV7181B. ALSB set to a Logic 0 sets the address for a
write as 0x40; for ALSB set to a logic high, the address selected is 0x42.
System Reset Input, Active Low. A minimum low reset pulse width of 5 ms is required to reset
the ADV7181B circuitry.
This is a line-locked output clock for the pixel data output by the ADV7181B. Nominally 27 MHz,
but varies up or down according to video line length.
This is the input pin for the 28.6363 MHz crystal, or can be overdriven by an external 3.3 V,
27 MHz clock oscillator source. In crystal mode, the crystal must be a fundamental crystal.
This pin should be connected to the 28.6363 MHz crystal or left as a no connect if an external
3.3 V, 27 MHz clock oscillator source is used to clock the ADV7181B. In crystal mode, the crystal
must be a fundamental crystal.
A logic low on this pin places the ADV7181B in power-down mode. Refer to the I2C Register
Maps section for more options on power-down modes for the ADV7181B.
The recommended external loop filter must be connected to this ELPF pin, as shown in
Figure 45.
Subcarrier Frequency Lock. This pin contains a serial output stream that can be used to lock the
subcarrier frequency when this decoder is connected to any Analog Devices digital video
encoder.
Internal Voltage Reference Output. Refer to Figure 45 for a recommended capacitor network for
this pin.
The CML pin is a common-mode level for the internal ADCs. Refer to Figure 45 for a
recommended capacitor network for this pin.
ADC’s Capacitor Network. Refer to Figure 45 for a recommended capacitor network for this pin.
ADC’s Capacitor Network. Refer to Figure 45 for a recommended capacitor network for this pin.
O
42
LE
TE
Mnemonic
DGND
AGND
DVDDIO
DVDD
AVDD
PVDD
AIN1 to AIN6
NC
B
SO
Pin No.
3, 10, 24, 34, 57
32, 37, 43, 45
4, 11
23, 58
40
31
35, 36, 46 to 49
12, 13, 27, 28,
33, 50, 55, 56
5 to 8, 14 to 19,
25, 26, 59 to 62
2
64
63
1
38, 39
44
CML
O
CAPY1, CAPY2
CAPC2
I
I
Rev. B | Page 12 of 100
ADV7181B
ANALOG FRONT END
AIN2
AIN1
AIN4
AIN3
AIN6
AIN5
ADC_SW_MAN_EN
AIN2
AIN1
AIN4
AIN3
AIN6
AIN5
ADC0_SW[3:0]
ADC0
AIN4
AIN3
AIN6
AIN5
ADC1_SW[3:0]
ADC2_SW[3:0]
ADC2
04984-005
AIN6
AIN5
TE
ADC1
LE
Figure 5. Internal Pin Connections
SETADC_sw_man_en, Manual Input Muxing Enable,
Address C4[7]
•
The analog input muxing section must be configured to
correctly route the video from the analog input pins to the
correct set of ADCs.
ADC0_sw[3:0], ADC0 mux configuration, Address C3[3:0]
ADC1_sw[3:0], ADC1 mux configuration, Address C3[7:4]
ADC2_sw[3:0], ADC2 mux configuration, Address C4[3:0]
•
The standard definition processor block, which decodes
the digital data, should be configured to process either
CVBS, YC, or YPrPb.
B
SO
The two key steps to configure the ADV7181B to correctly
decode the input video are:
ANALOG INPUT MUXING
The ADV7181B has an integrated analog muxing section that
allows more than one source of video signal to be connected to
the decoder. Figure 5 outlines the overall structure of the input
muxing provided in the ADV7181B.
O
A maximum of six CVBS inputs can be connected and decoded
by the ADV7181B. As seen in the Pin Configuration and
Function Description section, these analog input pins lie near
each other; therefore, a careful design of the PCB layout is
required, such as ground shielding between all signals routed
through tracks that are physically close together. It is strongly
recommended to connect any unused analog input pins to
AGND to act as a shield.
To configure the ADV7181B analog muxing section, the user
must select the analog input (AIN1 to AIN6) that is to be
processed by each ADC. SETADC_sw_man_en must be set to 1
to enable the muxing blocks to be configured. The three mux
sections are controlled by the signal buses ADC0/1/2_sw[3:0].
Table 8 explains the control words used.
The input signal that contains the timing information (H/V
syncs) must be processed by ADC0. For example, in the
YC input configuration, ADC0 should be connected to the
Y channel and ADC1 to the C channel. When one or more
ADCs are not used to process video, such as CVBS input, the idle
ADCs should be powered down (see the ADC Power-Down
Control section).
Restrictions on the channel routing are imposed by the analog
signal routing inside the IC; it is not possible for each input pin
to be routed to each ADC. Refer to Table 8 for an overview on
the routing capabilities inside the chip.
Rev. B | Page 13 of 100
ADV7181B
Table 8. Manual Mux Settings for All ADCs (SETADC_sw_man_en = 1)
ADC1_sw[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
ADC1 Connected to
No connection
No connection
No connection
No connection
AIN4
AIN6
No connection
No connection
No connection
No connection
No connection
No connection
AIN3
AIN5
No connection
No connection
ADC2 Connected to:
No connection
No connection
No connection
No connection
No connection
AIN6
No connection
No connection
No connection
No connection
No connection
No connection
No connection
AIN5
No connection
No connection
INSEL[3:0] Input Selection, Address 0x00[3:0]
CONNECTING
ANALOG SIGNALS
TO ADV7181B
The INSEL bits allow the user to select the input format. It
configures the standard definition processor core to process
CVBS (Comp), S-Video (Y/C), or Component (YPrPb) format.
SET INSEL[3:0] TO
CONFIGURE ADV7181B TO
DECODE VIDEO FORMAT:
CVBS: 0000
YC: 0110
YPrPb: 1001
Table 9. Standard Definition Processor Format Selection,
INSEL[3:0]
04984-006
B
SO
CONFIGURE ADC INPUTS USING
MUXING CONTROL BITS
(ADC_sw_man_en, ADC0_sw,
ADC1_sw, ADC2_sw)
ADC2_sw[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
TE
ADC0 Connected to
No connection
AIN2
No connection
No connection
AIN4
AIN6
No connection
No connection
No connection
AIN1
No connection
No connection
AIN3
AIN5
No connection
No connection
LE
ADC0_sw[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
INSEL[3:0]
0000
0110
1001
O
Figure 6. Input Muxing Overview
Rev. B | Page 14 of 100
Video Format
Composite
Y/C
YPrPb
ADV7181B
GLOBAL CONTROL REGISTERS
Register control bits listed in this section affect the whole chip.
PWRDN_ADC_0, Address 0x3A[3]
POWER-SAVE MODES
When PWRDN_ADC_0 is 0 (default), the ADC is in normal
operation.
The digital core of the ADV7181B can be shut down by using a
pin (PWRDN) and a bit (PWRDN); see below. The PDBP
controls which of the two has the higher priority. By default, the
pin (PWRDN) is given priority. This allows the user to have the
ADV7181B powered down by default.
When PWRDN_ADC_0 is 1, ADC 0 is powered down.
PDBP, Address 0x0F[2]
When PWRDN_ADC_1 is 1, ADC 1 is powered down.
When PDBP is 0 (default), the digital core power is controlled
by the PWRDN pin (the bit is disregarded).
TE
Power-Down
When PDBP is 1, the bit has priority (the pin is disregarded).
PWRDN_ADC_1, Address 0x3A[2]
When PWRDN_ADC_1 is 0 (default), the ADC is in normal
operation.
PWRDN_ADC_2, Address 0x3A[1]
When PWRDN_ADC_2 is 0 (default), the ADC is in normal
operation (default).
When PWRDN_ADC_2 is 1, ADC 2 is powered down.
PWRDN, Address 0x0F[5]
RESET CONTROL
LE
Setting the PWRDN bit switches the ADV7181B into a chipwide power-down mode. The power-down stops the clock from
entering the digital section of the chip, thereby freezing its
operation. No I2C bits are lost during power-down. The
PWRDN bit also affects the analog blocks and switches them
into low current modes. The I2C interface is unaffected and
remains operational in power-down mode.
B
SO
The ADV7181B leaves the power-down state if the PWRDN bit
is set to 0 (via I2C), or if the overall part is reset using the
RESET pin.
PDBP must be set to 1 for the PWRDN bit to power down the
ADV7181B.
When PWRDN is 0 (default), the chip is operational.
When PWRDN is 1, the ADV7181B is in chip-wide power-down.
ADC Power-Down Control
Chip Reset (RES), Address 0x0F[7]
Setting this bit, equivalent to controlling the RESET pin on the
ADV7181B, issues a full chip reset. All I2C registers are reset to
their default values. Note that some register bits do not have a
reset value specified; they keep their last written value. Those
bits are marked as having a reset value of x in the register table.
After the reset sequence, the part immediately starts to acquire
the incoming video signal.
After setting the RES bit (or initiating a reset via the pin), the
part returns to the default mode of operation with respect to its
primary mode of operation. All I2C bits are loaded with their
default values, making this bit self-clearing.
Executing a software reset takes approximately 2 ms. However,
it is recommended to wait 5 ms before any further I2C writes are
performed.
The I2C master controller receives a no acknowledge condition
on the ninth clock cycle when chip reset is implemented. See
the MPU Port Description section.
The ADCs should be powered down when in:
When RES is 0 (default), operation is normal.
•
CVBS mode. ADC 1 and ADC 2 should be powered down
to save on power consumption.
When RES is 1, the reset sequence starts.
•
S-Video mode. ADC 2 should be powered down to save on
power consumption.
O
The ADV7181B contains three 9-bit ADCs (ADC 0, ADC 1,
and ADC 2). If required, it is possible to power down each ADC
individually.
Rev. B | Page 15 of 100
ADV7181B
GLOBAL PIN CONTROL
Individual drive strength controls are provided via the
DR_STR_XX bits.
This bit allows the user to three-state the output drivers of the
ADV7181B.
Upon setting the TOD bit, the P15 to P0, HS, VS, FIELD, and
SFL pins are three-stated.
The timing pins (HS/VS/FIELD) can be forced active via the
TIM_OE bit. For more information on three-state control, refer
to the Three-State LLC Driver and the Timing Signals Output
Enable sections.
Individual drive strength controls are provided via the
DR_STR_XX bits.
When TIM_OE is 0 (default), HS, VS, and FIELD are threestated according to the TOD bit.
When TIM_OE is 1, HS, VS, and FIELD are forced active all the
time.
Drive Strength Selection (Data)
DR_STR[1:0] Address 0xF4[5:4]
For EMC and crosstalk reasons, it can be desirable to strengthen
or weaken the drive strength of the output drivers. The
DR_STR[1:0] bits affect the P[15:0] output drivers.
TE
Three-State Output Drivers
TOD, Address 0x03[6]
When TOD is 0 (default), the output drivers are enabled.
For more information on three-state control, refer to the Drive
Strength Selection (Clock) and the Drive Strength Selection
(Sync) sections.
When TOD is 1, the output drivers are three-stated.
Table 10. DR_STR Function
DR_STR[1:0]
00
01 (default)
10
11
Description
Low drive strength (1×)
Medium low drive strength (2×)
Medium high drive strength (3×)
High drive strength (4×)
LE
Three-State LLC Driver
TRI_LLC, Address 0x1D[7]
Drive Strength Selection (Clock)
DR_STR_C[1:0] Address 0xF4[3:2]
B
SO
This bit allows the output drivers for the LLC pin of the
ADV7181B to be three-stated. For more information on threestate control, see the Three-State Output Drivers and the
Timing Signals Output Enable sections.
Individual drive strength controls are provided via the
DR_STR_XX bits.
When TRI_LLC is 0 (default), the LLC pin drivers work
according to the DR_STR_C[1:0] setting (pin enabled).
The DR_STR_C[1:0] bits can be used to select the strength of
the clock signal output driver (LLC pin). For more information,
refer to the Drive Strength Selection (Sync) and the Drive
Strength Selection (Data) sections.
When TRI_LLC is 1, the LLC pin drivers are three-stated.
Table 11. DR_STR_C Function
Timing Signals Output Enable
TIM_OE, Address 0x04[3]
O
The TIM_OE bit should be regarded as an addition to the TOD
bit. Setting it high forces the output drivers for HS, VS, and
FIELD into the active (driving) state even if the TOD bit is set.
If set to low, the HS, VS, and FIELD pins are three-state
dependent on the TOD bit. This functionality is useful if the
decoder is to be used as a timing generator only. This may be
the case if only the timing signals are to be extracted from an
incoming signal, or if the part is in free-run mode where a
separate chip can output, for instance, a company logo.
For more information on three-state control, see the ThreeState Output Drivers and the Three-State LLC Driver sections.
DR_STR[1:0]
00
01 (default)
10
11
Description
Low drive strength (1×)
Medium low drive strength (2×)
Medium high drive strength (3×)
High drive strength (4×)
Drive Strength Selection (Sync)
DR_STR_S[1:0] Address 0xF4[1:0]
The DR_STR_S[1:0] bits allow the user to select the strength of
the synchronization signals with which HS, VS, and F are driven.
For more information, refer to the Drive Strength Selection
(Data) section.
Table 12. DR_STR_S Function
DR_STR[1:0]
00
01 (default)
10
11
Rev. B | Page 16 of 100
Description
Low drive strength (1×)
Medium low drive strength (2×).
Medium high drive strength (3×)
High drive strength (4×)
ADV7181B
Enable Subcarrier Frequency Lock Pin
EN_SFL_PIN Address 0x04[1]
Polarity LLC Pin
PCLK Address 0x37[0]
The EN_SFL_PIN bit enables the output of subcarrier lock
information (also known as GenLock) from the ADV7181B
core to an encoder in a decoder-encoder back-to-back
arrangement.
The polarity of the clock that leaves the ADV7181B via the LLC
pin can be inverted using the PCLK bit.
When EN_SFL_PIN is 0 (default), the subcarrier frequency lock
output is disabled.
When EN_SFL_PIN is 1, the subcarrier frequency lock
information is presented on the SFL pin.
Changing the polarity of the LLC clock output can be necessary
to meet the setup-and-hold time expectations of follow-on
chips.
When PCLK is 0, the LLC output polarity is inverted.
O
B
SO
LE
TE
When PCLK is 1 (default), the LLC output polarity is normal
(as per the timing diagrams).
Rev. B | Page 17 of 100
ADV7181B
GLOBAL STATUS REGISTERS
Four registers provide summary information about the video
decoder. The IDENT register allows the user to identify the
revision code of the ADV7181B. The other three registers
contain status bits from the ADV7181B.
IDENTIFICATION
IDENT[7:0] Address 0x11[7:0]
Table 14. STATUS 1 Function
STATUS 1[7:0]
0
1
Bit Name
IN_LOCK
LOST_LOCK
2
3
FSC_LOCK
FOLLOW_PW
4
5
6
7
AD_RESULT.0
AD_RESULT.1
AD_RESULT.2
COL_KILL
An identification value of 0x11 indicates the ADV7181 released
silicon.
An identification value of 0x13 indicates the ADV7181B silicon.
TE
The register identification of the revision of the ADV7181B.
STATUS 2
STATUS 1
STATUS_2[7:0], Address 0x12[7:0]
Table 15. STATUS 2 Function
This read-only register provides information about the internal
status of the ADV7181B.
STATUS 2[7:0]
0
Bit Name
MVCS DET
See the CIL[2:0] Count Into Lock, Address 0x51[2:0] and the
COL[2:0] Count Out-of-Lock, Address 0x51[5:3] sections for
information on the timing.
1
MVCS T3
Depending on the setting of the FSCLE bit, the Status 0 and
Status 1 are based solely on horizontal timing information or on
the horizontal timing and lock status of the color subcarrier. See
the FSCLE FSC Lock Enable, Address 0x51[7] section.
2
MV_PS DET
3
MV_AGC DET
B
SO
LE
STATUS_1[7:0] Address 0x10[7:0]
AUTODETECTION RESULT
AD_RESULT[2:0] Address 0x10[6:4]
The AD_RESULT[2:0] bits report back on the findings from the
ADV7181B autodetection block. Consult the General Setup
section for more information on enabling the autodetection
block, and the Autodetection of SD Modes section to determine
how to configure it.
Table 13. AD_RESULT Function
Description
NTSM-MJ
NTSC-443
PAL-M
PAL-60
PAL-B/G/H/I/D
SECAM
PAL-Combination N
SECAM 525
O
AD_RESULT[2:0]
000
001
010
011
100
101
110
111
Description
In lock (right now).
Lost lock (since last read
of this register).
FSC locked (right now).
AGC follows peak white
algorithm.
Result of autodetection.
Result of autodetection.
Result of autodetection.
Color kill active.
4
5
LL_NSTD
FSC_NSTD
6
7
Reserved
Reserved
Description
Detected Macrovision color
striping.
Macrovision color striping
protection. Conforms to
Type 3 (if high), and Type 2
(if low).
Detected Macrovision
pseudo sync pulses.
Detected Macrovision AGC
pulses.
Line length is nonstandard.
FSC frequency is
nonstandard.
STATUS 3
STATUS_3[7:0], Address 0x13[7:0]
Table 16. STATUS 3 Function
STATUS 3[7:0]
0
Bit Name
INST_HLOCK
1
2
GEMD
SD_OP_50HZ
3
4
FREE_RUN_ACT
5
STD_FLD_LEN
6
INTERLACED
7
PAL_SW_LOCK
Rev. B | Page 18 of 100
Description
Horizontal lock indicator
(instantaneous).
Gemstar Detect.
Flags whether 50 Hz or
60 Hz are present at output.
Reserved for future use.
ADV7181B outputs a blue
screen (see the
DEF_VAL_EN Default Value
Enable, Address 0x0C[0]
section).
Field length is correct for
currently selected video
standard.
Interlaced video detected
(field sequence found).
Reliable sequence of
swinging bursts detected.
ADV7181B
STANDARD DEFINITION PROCESSOR (SDP)
STANDARD DEFINITION PROCESSOR
DIGITIZED CVBS
DIGITIZED C (YC)
LUMA
DIGITAL
FINE
CLAMP
CHROMA
DIGITAL
FINE
CLAMP
CHROMA
DEMOD
STANDARD
AUTODETECTION
SLLC
CONTROL
LUMA
FILTER
GAIN
CONTROL
LUMA
RESAMPLE
SYNC
EXTRACT
LINE
LENGTH
PREDICTOR
RESAMPLE
CONTROL
CHROMA
FILTER
GAIN
CONTROL
AV
CODE
INSERTION
CHROMA
RESAMPLE
CHROMA
2D COMB
LE
FSC
RECOVERY
LUMA
2D COMB
VIDEO DATA
OUTPUT
MEASUREMENT
BLOCK (≥ I2C)
VIDEO DATA
PROCESSING
BLOCK
04984-007
DIGITIZED CVBS
DIGITIZED Y (YC)
VBI DATA
RECOVERY
TE
MACROVISION
DETECTION
Figure 7. Block Diagram of the Standard Definition Processor
A block diagram of the ADV7181B’s standard definition
processor (SDP) is shown in Figure 7.
SD CHROMA PATH
The ADV7181B can handle standard definition video in CVBS,
YC, and YPrPb formats. It can be divided into a luminance and
chrominance path. If the input video is of a composite type
(CVBS), both processing paths are fed with the CVBS input.
The input signal is processed by the following blocks:
Digital Fine Clamp. This block uses a high precision
algorithm to clamp the video signal.
•
Digital Fine Clamp. This block uses a high precision
algorithm to clamp the video signal.
Chroma Demodulation. This block uses a color subcarrier
(FSC) recovery unit to regenerate the color subcarrier for
any modulated chroma scheme. The demodulation block
then performs an AM demodulation for PAL and NTSC,
and an FM demodulation for SECAM.
•
Luma Filter Block. This block contains a luma decimation
filter (YAA) with a fixed response, and some shaping filters
(YSH) that have selectable responses.
Chroma Filter Block. This block contains a chroma
decimation filter (CAA) with a fixed response, and some
shaping filters (CSH) that have selectable responses.
•
Gain Control. Automatic gain control (AGC) can operate
on several different modes, including gain based on the
color subcarrier’s amplitude, gain based on the depth of the
horizontal sync pulse on the luma channel, or fixed manual
gain.
•
Chroma Resample. The chroma data is digitally resampled
to keep it perfectly aligned with the luma data. The
resampling is performed to correct for static and dynamic
line-length errors of the incoming video signal.
•
Chroma 2D Comb. The two-dimensional, 5-line,
superadaptive comb filter provides high quality YC
separation in case the input signal is CVBS.
•
AV Code Insertion. At this point, the demodulated chroma
(Cr and Cb) signal is merged with the retrieved luma
values. AV codes (as per ITU-R BT.656) can be inserted.
B
SO
•
SD LUMA PATH
The input signal is processed by the following blocks:
•
O
•
•
Luma Gain Control. The automatic gain control (AGC)
can operate on a variety of different modes, including gain
based on the depth of the horizontal sync pulse, peak white
mode, and fixed manual gain.
•
Luma Resample. To correct for line-length errors as well as
dynamic line-length changes, the data is digitally
resampled.
•
Luma 2D Comb. The two-dimensional comb filter
provides YC separation.
•
AV Code Insertion. At this point, the decoded luma (Y)
signal is merged with the retrieved chroma values. AV
codes (as per ITU-R BT.656) can be inserted.
Rev. B | Page 19 of 100
ADV7181B
SYNC PROCESSING
GENERAL SETUP
The ADV7181B extracts syncs embedded in the video data
stream. There is currently no support for external HS/VS
inputs. The sync extraction has been optimized to support
imperfect video sources such as VCRs with head switches. The
actual algorithm used employs a coarse detection based on a
threshold crossing followed by a more detailed detection using
an adaptive interpolation algorithm. The raw sync information
is sent to a line-length measurement and prediction block. The
output of this is then used to drive the digital resampling
section to ensure that the ADV7181B outputs 720 active pixels
per line.
Video Standard Selection
The VID_SEL[3:0] register allows the user to force the digital
core into a specific video standard. Under normal circumstances,
this should not be necessary. The VID_SEL[3:0] bits default to
an autodetection mode that supports PAL, NTSC, SECAM, and
variants thereof. The Autodetection of SD Modes section
provides more information on the autodetection system.
Autodetection of SD Modes
•
VID_SEL[3:0]Address 0x00[7:4]
Hsync Processor. The Hsync processor is designed to filter
incoming Hsyncs that are corrupted by noise, providing
much improved performance for video signals with stable
time base but poor SNR.
VBI DATA RECOVERY
Table 17. VID_SEL Function
LE
•
Vsync Processor. This block provides extra filtering of the
detected Vsyncs to improve vertical lock.
TE
The sync processing on the ADV7181B also includes the
following specialized postprocessing blocks that filter and
condition the raw sync information retrieved from the digitized
analog video:
To guide the autodetect system of the ADV7181B, individual
enable bits are provided for each of the supported video
standards. Setting the relevant bit to 0 inhibits the standard
from being detected automatically. Instead, the system picks the
closest of the remaining enabled standards. The results of the
autodetection block can be read back via the status registers. See
the Global Status Registers section for more information.
VID_SEL[3:0]
0000 (default)
0001
0010
0011
•
Wide-screen signaling (WSS)
•
Copy generation management system (CGMS)
•
Closed captioning (CC)
•
Macrovision protection presence
•
EDTV data
•
Gemstar-compatible data slicing
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
O
B
SO
The ADV7181B can retrieve the following information from the
input video:
The ADV7181B is also capable of automatically detecting the
incoming video standard with respect to
•
Color subcarrier frequency
•
Field rate
•
Line rate
Description
Autodetect (PAL BGHID) <–> NTSC J
(no pedestal), SECAM.
Autodetect (PAL BGHID) <–> NTSC M
(pedestal), SECAM.
Autodetect (PAL N) (pedestal) <–> NTSC J
(no pedestal), SECAM.
Autodetect (PAL N) (pedestal) <–> NTSC M
(pedestal), SECAM.
NTSC J (1).
NTSC M (1).
PAL60.
NTSC 4.43 (1).
PAL BGHID.
PAL N = PAL BGHID (with pedestal).
PAL M (without pedestal).
PAL M.
PAL-Combination N.
PAL-Combination N (with pedestal).
SECAM.
SECAM (with pedestal).
AD_SEC525_EN Enable Autodetection of SECAM 525
Line Video, Address 0x07 [7]
Setting AD_SEC525_EN to 0 (default) disables the
autodetection of a 525-line system with a SECAM style, FMmodulated color component.
The ADV7181B can configure itself to support PAL-B/G/H/I/D,
PAL-M/N, PAL-combination N, NTSC-M, NTSC-J, SECAM
50 Hz/60 Hz, NTSC4.43, and PAL60.
Setting AD_SEC525_EN to 1 enables the detection.
Rev. B | Page 20 of 100
ADV7181B
AD_SECAM_EN Enable Autodetection of SECAM,
Address 0x07 [6]
AD_PAL_EN Enable Autodetection of PAL,
Address 0x07[0]
Setting AD_SECAM_EN to 0 (default) disables the
autodetection of SECAM.
Setting AD_PAL_EN to 0 (default) disables the detection of
standard PAL.
Setting AD_SECAM_EN to 1 enables the detection.
Setting AD_PAL_EN to 1 enables the detection.
AD_N443_EN Enable Autodetection of NTSC 443,
Address 0x07 [5]
SFL_INV Subcarrier Frequency Lock Inversion
This bit controls the behavior of the PAL switch bit in the SFL
(GenLock Telegram) data stream. It was implemented to solve
some compatibility issues with video encoders. It solves two
problems.
Setting AD_N443_EN to 0 disables the autodetection of NTSC
style systems with a 4.43 MHz color subcarrier.
Setting AD_N443_EN to 1 (default) enables the detection.
First, the PAL switch bit is only meaningful in PAL. Some
encoders (including Analog Devices encoders) also look at the
state of this bit in NTSC.
TE
AD_P60_EN Enable Autodetection of PAL60,
Address 0x07[4]
Setting AD_P60_EN to 0 disables the autodetection of PAL
systems with a 60 Hz field rate.
Second, there was a design change in Analog Devices encoders
from ADV717x to ADV719x. The older versions used the SFL
(GenLock Telegram) bit directly, while the later ones invert the
bit prior to using it; this is because the inversion compensated
for the 1-line delay of an SFL (GenLock Telegram) transmission.
Setting AD_P60_EN to 1 (default) enables the detection.
LE
AD_PALN_EN Enable Autodetection of PAL N,
Address 0x07[3]
Setting AD_PALN_EN to 0 (default) disables the detection of
the PAL N standard.
Setting AD_PALN_EN to 1 enables the detection.
B
SO
AD_PALM_EN Enable Autodetection of PAL M,
Address 0x07[2]
As a result, ADV717x encoders need the PAL switch bit in the
SFL (GenLock Telegram) to be 1 for NTSC to work. Also,
ADV7190/ADV7191/ADV7194 encoders need the PAL switch
bit in the SFL to be 0 to work in NTSC. If the state of the PAL
switch bit is wrong, a 180° phase shift occurs.
Setting AD_PALM_EN to 0 (default) disables the autodetection
of PAL M.
Setting AD_PALM_EN to 1 enables the detection.
AD_NTSC_EN Enable Autodetection of NTSC,
Address 0x07[1]
Setting AD_NTSC_EN to 0 (default) disables the detection of
standard NTSC.
O
Setting AD_NTSC_EN to 1 enables the detection.
In a decoder/encoder back-to-back system in which SFL is
used, the bit must be set up properly for the specific encoder
used.
SFL_INV Function Address 0x41[6]
Setting SFL_INV to 0 makes the part SFL-compatible with
ADV7190/ADV7191/ADV7194 encoders.
Setting SFL_INV to 1 (default) makes the part SFL-compatible
with ADV717x/ADV7173x encoders.
Lock-Related Controls
Lock information is presented to the user through Bits[1:0] of
the Status 1 register. See the STATUS_1[7:0] Address 0x10[7:0]
section. Figure 8 outlines the signal flow and the controls
available to influence the way the lock status information is
generated.
SELECT THE RAW LOCK SIGNAL
SRLS
1
0
FSC LOCK
0
1
COUNTER INTO LOCK
COUNTER OUT OF LOCK
STATUS 1 [0]
MEMORY
STATUS 1 [1]
04984-008
TIME_WIN
FREE_RUN
FILTER THE RAW LOCK SIGNAL
CIL[2:0], COL[2:0]
TAKE FSC LOCK INTO ACCOUNT
FSCLE
Figure 8. Lock-Related Signal Path
Rev. B | Page 21 of 100
ADV7181B
SRLS Select Raw Lock Signal, Address 0x51[6]
COL[2:0] Count Out-of-Lock, Address 0x51[5:3]
Using the SRLS bit, the user can choose between two sources for
determining the lock status (per Bits[1:0] in the Status 1 register).
COL[2:0] determines the number of consecutive lines for which
the out-of-lock condition must be true before the system
switches into unlocked state, and reports this via Status 0[1:0]. It
counts the value in lines of video.
•
The time_win signal is based on a line-to-line evaluation of
the horizontal synchronization pulse of the incoming
video. It reacts quite quickly.
The free_run signal evaluates the properties of the
incoming video over several fields, and takes vertical
synchronization information into account.
Setting SRLS to 0 (default) selects the free_run signal.
Setting SRLS to 1 selects the time_win signal.
FSCLE FSC Lock Enable, Address 0x51[7]
COL[2:0]
000
001
010
011
100 (default)
101
110
111
Description
1
2
5
10
100
500
1000
100000
COLOR CONTROLS
These registers allow the user to control picture appearance,
including control of the active data in the event of video being
lost. These controls are independent of any other controls. For
instance, brightness control is independent from picture
clamping, although both controls affect the signal’s dc level.
LE
The FSCLE bit allows the user to choose whether the status of
the color subcarrier loop is taken into account when the overall
lock status is determined and presented via Bits[1:0] in Status
Register 1. This bit must be set to 0 when operating the
ADV7181B in YPrPb component mode to generate a reliable
HLOCK status bit.
Table 20. COL Function
TE
•
When FSCLE is set to 0 (default), the overall lock status is only
dependent on horizontal sync lock.
CON[7:0] Contrast Adjust, Address 0x08[7:0]
This register allows the user to control contrast adjustment
of the picture.
VS_COAST[1:0], Address 0xF9[3:2]
Table 21. CON Function
B
SO
When FSCLE is set to 1, the overall lock status is dependent on
horizontal sync lock and FSC Lock.
CON[7:0]
0x80 (default)
0x00
0xFF
These bits are used to set VS free-run (coast) frequency.
Table 18. VS_COAST[1:0] Function
VS_COAST[1:0]
00 (default)
01
10
11
Description
Auto coast mode – follows VS
frequency from last video input
Forces 50 Hz coast mode
Forces 60 Hz coast mode
Reserved
Description
Gain on luma channel = 1
Gain on luma channel = 0
Gain on luma channel = 2
SD_SAT_Cb[7:0] SD Saturation Cb Channel,
Address 0xE3[7:0]
This register allows the user to control the gain of the Cb
channel only, which in turn adjusts the saturation of the picture.
Table 22. SD_SAT_Cb Function
CIL[2:0] determines the number of consecutive lines for which
the lock condition must be true before the system switches into
the locked state, and reports this via Status 0[1:0]. It counts the
value in lines of video.
SD_SAT_Cb[7:0]
0x80 (default)
0x00
0xFF
O
CIL[2:0] Count Into Lock, Address 0x51[2:0]
Table 19. CIL Function
CIL[2:0]
000
001
010
011
100 (default)
101
110
111
Description
1
2
5
10
100
500
1000
100000
Rev. B | Page 22 of 100
Description
Gain on Cb channel = 0 dB
Gain on Cb channel = −42 dB
Gain on Cb channel = +6 dB
ADV7181B
SD_SAT_Cr[7:0] SD Saturation Cr Channel, Address
0xE4[7:0]
HUE[7:0] Hue Adjust, Address 0x0B[7:0]
This register allows the user to control the gain of the Cr
channel only, which in turn adjusts the saturation of the picture.
Table 23. SD_SAT_Cr Function
Description
Gain on Cr channel = 0 dB
Gain on Cb channel = −42 dB
Gain on Cb channel = +6 dB
The hue adjustment value is fed into the AM color demodulation block. Therefore, it applies only to video signals that contain
chroma information in the form of an AM-modulated carrier
(CVBS or Y/C in PAL or NTSC). It does not affect SECAM and
does not work on component video inputs (YPrPb).
SD_OFF_Cb[7:0] SD Offset Cb Channel, Address
0xE1[7:0]
Table 27. HUE Function
HUE[7:0]
0x00 (default)
0x7F
0x80
This register allows the user to select an offset for the Cb
channel only and adjust the hue of the picture. There is a
functional overlap with the Hue[7:0] register.
Table 24. SD_OFF_Cb Function
Description
0 offset applied to the Cb channel
−312 mV offset applied to the Cb channel
+312 mV offset applied to the Cb channel
SD_OFF_Cr[7:0] SD Offset Cr Channel, Address
0xE2[7:0]
B
SO
This register allows the user to select an offset for the Cr channel
only and adjust the hue of the picture. There is a functional
overlap with the Hue[7:0] register.
DEF_Y[5:0] Default Value Y, Address 0x0C[7:2]
When the ADV7181B loses lock on the incoming video signal
or when there is no input signal, the DEF_Y[5:0] register allows
the user to specify a default luma value to be output. This value
is used under the following conditions:
•
If DEF_VAL_AUTO_EN bit is set to high and the
ADV7181B lost lock to the input video signal. This is
the intended mode of operation (automatic mode).
•
The DEF_VAL_EN bit is set, regardless of the lock
status of the video decoder. This is a forced mode that
may be useful during configuration.
Table 25. SD_OFF_Cr Function
SD_OFF_Cr[7:0]
0x80 (default)
0x00
0xFF
Description
0 offset applied to the Cr channel
−312 mV offset applied to the Cr channel
+312 mV offset applied to the Cr channel
BRI[7:0] Brightness Adjust, Address 0x0A[7:0]
O
This register controls the brightness of the video signal. It
allows the user to adjust the brightness of the picture.
Table 26. BRI Function
BRI[7:0]
0x00 (default)
0x7F
0x80
Description (Adjust Hue of the Picture)
Phase of the chroma signal = 0°
Phase of the chroma signal = –90°
Phase of the chroma signal = +90°
LE
SD_OFF_Cb[7:0]
0x80 (default)
0x00
0xFF
HUE[7:0] has a range of ±90°, with 0x00 equivalent to an
adjustment of 0°. The resolution of HUE[7:0] is 1 bit = 0.7°.
TE
SD_SAT_Cr[7:0]
0x80 (default)
0x00
0xFF
This register contains the value for the color hue adjustment.
It allows the user to adjust the hue of the picture.
Description
Offset of the luma channel = 0IRE
Offset of the luma channel = +100IRE
Offset of the luma channel = –100IRE
The DEF_Y[5:0] values define the 6 MSBs of the output video.
The remaining LSBs are padded with 0s. For example, in 8-bit
mode, the output is Y[7:0] = {DEF_Y[5:0], 0, 0}.
DEF_Y[5:0] is 0x0D (blue) is the default value for Y.
Register 0x0C has a default value of 0x36.
DEF_C[7:0] Default Value C, Address 0x0D[7:0]
The DEF_C[7:0] register complements the DEF_Y[5:0] value.
It defines the 4 MSBs of Cr and Cb values to be output if
•
The DEF_VAL_AUTO_EN bit is set high and the
ADV7181B cannot lock to the input video (automatic
mode).
•
DEF_VAL_EN bit is set to high (forced output).
The data that is finally output from the ADV7181B for the
chroma side is Cr[7:0] = {DEF_C[7:4], 0, 0, 0, 0}, Cb[7:0] =
{DEF_C[3:0], 0, 0, 0, 0}.
DEF_C[7:0] is 0x7C (blue) is the default value for Cr and Cb.
Rev. B | Page 23 of 100
ADV7181B
DEF_VAL_EN Default Value Enable, Address 0x0C[0]
The clamping can be divided into two sections
This bit forces the use of the default values for Y, Cr, and Cb.
Refer to the descriptions for DEF_Y and DEF_C for additional
information. In this mode, the decoder also outputs a stable
27 MHz clock, HS, and VS.
•
Clamping before the ADC (analog domain): current
sources.
•
Clamping after the ADC (digital domain): digital
processing block.
Setting DEF_VAL_EN to 0 (default) outputs a colored screen
determined by user-programmable Y, Cr, and Cb values when
the decoder free-runs. Free-run mode is turned on and off by
the DEF_VAL_AUTO_EN bit.
The ADCs can digitize an input signal only if it resides within
the ADC’s 1.6 V input voltage range. An input signal with a dc
level that is too large or too small is clipped at the top or bottom
of the ADC range.
Setting DEF_VAL_EN to 1 forces a colored screen output
determined by user-programmable Y, Cr, and Cb values.
This overrides picture data even if the decoder is locked.
TE
The primary task of the analog clamping circuits is to ensure
that the video signal stays within the valid ADC input window
so the analog-to-digital conversion can take place. It is not
necessary to clamp the input signal with a very high accuracy in
the analog domain as long as the video signal fits the ADC range.
DEF_VAL_AUTO_EN Default Value Automatic Enable,
Address 0x0C[1]
This bit enables the automatic use of the default values for Y, Cr,
and Cb when the ADV7181B cannot lock to the video signal.
After digitization, the digital fine clamp block corrects for any
remaining variations in dc level. Since the dc level of an input
video signal refers directly to the brightness of the picture
transmitted, it is important to perform a fine clamp with high
accuracy; otherwise, brightness variations can occur. Furthermore, dynamic changes in the dc level almost certainly lead to
visually objectionable artifacts and must therefore be prohibited.
LE
Setting DEF_VAL_AUTO_EN to 0 disables free-run mode.
If the decoder is unlocked, it outputs noise.
Setting DEF_VAL_EN to 1 (default) enables free-run mode, and
a colored screen set by user-programmable Y, Cr and Cb values
is displayed when the decoder loses lock.
The clamping scheme has to complete two tasks. It must be able
to acquire a newly connected video signal with a completely
unknown dc level, and it must maintain the dc level during
normal operation.
B
SO
CLAMP OPERATION
The input video is ac-coupled into the ADV7181B through a
0.1 μF capacitor. It is recommended that the input video signal
range be 0.5 V to1.6 V (typically 1 V p-p). If the signal exceeds
this range, it cannot be processed correctly in the decoder.
Because the input signal is ac-coupled into the decoder, its dc
value needs to be restored. This process is referred to as
clamping the video. This section explains the general process of
clamping on the ADV7181B and shows the different ways in
which a user can configure its behavior.
For quickly acquiring an unknown video signal, the large current
clamps can be activated. It is assumed that the amplitude of the
video signal at this point is of a nominal value. Control of the
coarse and fine current clamp parameters is performed
automatically by the decoder.
Standard definition video signals can have excessive noise on
them. In particular, CVBS signals transmitted by terrestrial
broadcast and demodulated using a tuner usually show very
large levels of noise (>100 mV). A voltage clamp would be
unsuitable for this type of video signal. Instead, the ADV7181B
uses a set of four current sources that can cause coarse
(>0.5 mA) and fine (<0.1 mA) currents to flow into and away
from the high impedance node that carries the video signal
(see Figure 9).
O
The ADV7181B uses a combination of current sources and
a digital processing block for clamping, as shown in Figure 9.
The analog processing channel shown is replicated three times
inside the IC. While only one single channel (and only one
ADC) is needed for a CVBS signal, two independent channels
are needed for YC (S-VHS) type signals, and three independent
channels are needed to allow component signals (YPrPb) to be
processed.
ANALOG
VIDEO
INPUT
COARSE CURRENT SOURCES
ADC
DATA
PREPROCESSOR
(DPP)
CLAMP CONTROL
Figure 9. Clamping Overview
Rev. B | Page 24 of 100
SDP
WITH DIGITAL
FINE CLAMP
04984-009
FINE CURRENT SOURCES
ADV7181B
The following sections describe the I2C signals that can be used
to influence the behavior of the clamping block.
Previous revisions of the ADV7181B had controls (FACL/FICL,
fast and fine clamp length) to allow configuration of the length
for which the coarse (fast) and fine current sources are switched
on. These controls were removed on the ADV7181-FT and
replaced by an adaptive scheme.
LUMA FILTER
Data from the digital fine clamp block is processed by three sets
of filters. The data format at this point is CVBS for CVBS input
or luma only for Y/C and YPrPb input formats.
•
CCLEN Current Clamp Enable, Address 0x14[4]
When CCLEN is 0, the current sources are switched off.
When CCLEN is 1 (default), the current sources are enabled.
DCT[1:0] Digital Clamp Timing, Address 0x15[6:5]
TE
The current clamp enable bit allows the user to switch off the
current sources in the analog front end altogether. This can be
useful if the incoming analog video signal is clamped externally.
•
Luma Shaping Filters (YSH). The shaping filter block is
a programmable low-pass filter with a wide variety of
responses. It can be used to selectively reduce the luma
video signal bandwidth (needed prior to scaling, for
example). For some video sources that contain high
frequency noise, reducing the bandwidth of the luma
signal improves visual picture quality. A follow-on video
compression stage can work more efficiently if the video
is low-pass filtered.
LE
The clamp timing register determines the time constant of the
digital fine clamp circuitry. It is important to realize that the
digital fine clamp reacts very quickly because it is supposed to
immediately correct any residual dc level error for the active
line. The time constant of the digital fine clamp must be much
quicker than the one from the analog blocks.
Luma Antialias Filter (YAA). The ADV7181B receives
video at a rate of 27 MHz. (In the case of 4× oversampled
video, the ADCs sample at 54 MHz, and the first decimation is performed inside the DPP filters. Therefore, the
data rate into the ADV7181B is always 27 MHz.) The ITUR BT.601 recommends a sampling frequency of 13.5 MHz.
The luma antialias filter decimates the oversampled video
using a high quality, linear phase, low-pass filter that
preserves the luma signal while at the same time attenuating out-of-band components. The luma antialias filter
(YAA) has a fixed response.
B
SO
By default, the time constant of the digital fine clamp is adjusted
dynamically to suit the currently connected input signal.
The ADV7181B has two responses for the shaping filter:
one that is used for good quality CVBS, component, and
S-VHS type sources, and a second for nonstandard CVBS
signals.
Table 28. DCT Function
DCT[1:0]
00
01
10 (default)
11
Description
Slow (TC = 1 sec)
Medium (TC = 0.5 sec)
Fast (TC = 0.1 sec)
Determined by ADV7181B, depending on the
input video parameters
DCFE Digital Clamp Freeze Enable, Address 0x15[4]
The YSH filter responses also include a set of notches for
PAL and NTSC. However, it is recommended to use the
comb filters for YC separation.
•
O
This register bit allows the user to freeze the digital clamp loop
at any time. It is intended for users who would like to do their
own clamping. Users should disable the current sources for
analog clamping via the appropriate register bits, wait until the
digital clamp loop settles, and then freeze it via the DCFE bit.
When DCFE is 0 (default), the digital clamp is operational.
When DCFE is 1, the digital clamp loop is frozen.
Digital Resampling Filter. This block is used to allow
dynamic resampling of the video signal to alter parameters
such as the time base of a line of video. Fundamentally, the
resampler is a set of low-pass filters. The actual response is
chosen by the system with no requirement for user
intervention.
Figure 11 through Figure 14 show the overall response of all
filters together. Unless otherwise noted, the filters are set into a
typical wideband mode.
Rev. B | Page 25 of 100
ADV7181B
For input signals in CVBS format, the luma shaping filters play
an essential role in removing the chroma component from a
composite signal. YC separation must aim for the best possible
crosstalk reduction while still retaining as much bandwidth
(especially on the luma component) as possible. High quality
YC separation can be achieved by using the internal comb filters
of the ADV7181B. Comb filtering, however, relies on the
frequency relationship of the luma component (multiples of the
video line rate) and the color subcarrier (Fsc). For good quality
CVBS signals, this relationship is known; the comb filter
algorithms can be used to separate out luma and chroma with
high accuracy.
With nonstandard video signals, the frequency relationship can
be disturbed and the comb filters may not be able to remove all
crosstalk artifacts in an optimum fashion without the assistance
of the shaping filter block.
The luma shaping filter has three control registers:
YSFM[4:0] Y-Shaping Filter Mode, Address 0x17[4:0]
The Y-shaping filter mode bits allow the user to select from a
wide range of low-pass and notch filters. When switched in
automatic mode, the filter is selected based on other register
selections, such as detected video standard, and also certain
properties extracted from the incoming video itself, such as
quality and time-base stability. The automatic selection always
picks the widest possible bandwidth for the video input
encountered.
•
YSFM[4:0] allows the user to manually select a shaping
filter mode (applied to all video signals) or to enable an
automatic selection (dependent on video quality and video
standard).
•
B
SO
•
The decisions of the control logic are shown in Figure 10.
•
WYSFMOVR allows the user to manually override the
WYSFM decision.
•
WYSFM[4:0] allows the user to select a different shaping
filter mode for good quality CVBS, component (YPrPb),
and S-VHS (YC) input signals.
O
If the YSFM settings specify a filter (such as, YSFM is set to
values other than 00000 or 00001), the chosen filter is
applied to all video, regardless of its quality.
LE
An automatic mode is provided. Here, the ADV7181B evaluates
the quality of the incoming video signal and selects the filter
responses in accordance with the signal quality and video
standard. YFSM, WYSFMOVR, and WYSFM allow the user to
manually override the automatic decisions in part or in full.
In automatic mode, the system preserves the maximum possible
bandwidth for good CVBS sources (since they can successfully
be combed) as well as for luma components of YPrPb and YC
sources, since they need not be combed. For poor quality
signals, the system selects from a set of proprietary shaping
filter responses that complements comb filter operation to
reduce visual artifacts.
TE
Y-Shaping Filter
In automatic selection mode, the notch filters are only used
for bad quality video signals. For all other video signals,
wideband filters are used.
WYSFMOVR Wideband Y-Shaping Filter Override,
Address 0x18[7]
Setting the WYSFMOVR bit enables the use of the
WYSFM[4:0] settings for good quality video signals. For more
information, refer to the general discussion of the luma shaping
filters in the Y-Shaping Filter section and the flowchart shown
in Figure 10.
When WYSFMOVR is 0, the shaping filter for good quality
video signals is selected automatically.
Setting WYSFMOVR to 1 (default) enables manual override via
WYSFM[4:0].
Rev. B | Page 26 of 100
ADV7181B
SET YSFM
YES
YSFM IN AUTO MODE?
00000 OR 00001
NO
VIDEO
QUALITY
BAD
GOOD
AUTO SELECT LUMA
SHAPING FILTER TO
COMPLEMENT COMB
USE YSFM SELECTED
FILTER REGARDLESS FOR
GOOD AND BAD VIDEO
WYSFMOVR
0
SELECT WIDEBAND
FILTER AS PER
WYSFM[4:0]
SELECT AUTOMATIC
WIDEBAND FILTER
04984-010
TE
1
Figure 10. YSFM and WYSFM Control Flowchart
Table 29. YSFM Function
WYSFM[4:0] Wideband Y Shaping Filter Mode,
Address 0x18[4:0]
LE
O
0'0001
(default)
0'0010
0'0011
0'0100
0'0101
0'0110
0'0111
0'1000
0'1001
0'1010
0'1011
0'1100
0'1101
0'1110
0'1111
1'0000
1'0001
1'0010
1'0011
1'0100
1'0101
1'0110
1'0111
1'1000
1'1001
1'1010
1'1011
1'1100
1'1101
1'1110
1'1111
Description
Automatic selection including a wide notch
response (PAL/NTSC/SECAM)
Automatic selection including a narrow notch
response (PAL/NTSC/SECAM)
SVHS 1
SVHS 2
SVHS 3
SVHS 4
SVHS 5
SVHS 6
SVHS 7
SVHS 8
SVHS 9
SVHS 10
SVHS 11
SVHS 12
SVHS 13
SVHS 14
SVHS 15
SVHS 16
SVHS 17
SVHS 18 (CCIR 601)
PAL NN 1
PAL NN 2
PAL NN 3
PAL WN 1
PAL WN 2
NTSC NN 1
NTSC NN 2
NTSC NN 3
NTSC WN 1
NTSC WN 2
NTSC WN 3
Reserved
The WYSFM[4:0] bits allow the user to manually select a
shaping filter for good quality video signals, for example, CVBS
with stable time base, luma component of YPrPb, luma
component of YC. The WYSFM bits are active only if the
WYSFMOVR bit is set to 1. See the general discussion of the
shaping filter settings in the Y-Shaping Filter section.
B
SO
YSFM[4:0]
0'0000
Table 30. WYSFM Function
WYSFM[4:0]
0'0000
0'0001
0'0010
0'0011
0'0100
0'0101
0'0110
0'0111
0'1000
0'1001
0'1010
0'1011
0'1100
0'1101
0'1110
0'1111
1'0000
1'0001
1'0010
1'0011 (default)
1'0100 to 1’1111
Rev. B | Page 27 of 100
Description
Do not use
Do not use
SVHS 1
SVHS 2
SVHS 3
SVHS 4
SVHS 5
SVHS 6
SVHS 7
SVHS 8
SVHS 9
SVHS 10
SVHS 11
SVHS 12
SVHS 13
SVHS 14
SVHS 15
SVHS 16
SVHS 17
SVHS 18 (CCIR 601)
Do not use
ADV7181B
COMBINED Y ANTIALIAS, NTSC NOTCH FILTERS,
Y RESAMPLE
The filter plots in Figure 11 show the S-VHS 1 (narrowest) to
S-VHS 18 (widest) shaping filter settings. Figure 13 shows the
PAL notch filter responses. The NTSC-compatible notches are
shown in Figure 14.
0
–10
0
–30
–40
–20
–50
–30
–60
–40
–70
0
2
4
6
8
FREQUENCY (MHz)
10
TE
AMPLITUDE (dB)
–10
–20
–50
12
04984-014
AMPLITUDE (dB)
COMBINED Y ANTIALIAS, S-VHS LOW-PASS FILTERS,
Y RESAMPLE
Figure 14. NTSC Notch Filter Response
–60
0
2
4
6
8
FREQUENCY (MHz)
10
12
04984-011
CHROMA FILTER
–70
COMBINED Y ANTIALIAS, CCIR MODE SHAPING FILTER,
Y RESAMPLE
0
•
–20
–40
–80
–100
–120
0
2
4
6
8
FREQUENCY (MHz)
10
12
Chroma Shaping Filters (CSH). The shaping filter block
(CSH) can be programmed to perform a variety of lowpass responses. It can be used to selectively reduce the
bandwidth of the chroma signal for scaling or compression.
•
Digital Resampling Filter. This block is used to allow
dynamic resampling of the video signal to alter parameters
such as the time base of a line of video. Fundamentally, the
resampler is a set of low-pass filters. The actual response is
chosen by the system without user intervention.
Figure 12. Y S-VHS 18 Extra Wideband Filter (CCIR 601 Compliant)
O
COMBINED Y ANTIALIAS, PAL NOTCH FILTERS,
Y RESAMPLE
The plots in Figure 15 show the overall response of all filters
together.
0
–20
–30
–40
–50
–60
–70
2
4
6
8
FREQUENCY (MHz)
10
12
04984-013
AMPLITUDE (dB)
–10
0
Chroma Antialias Filter (CAA). The ADV7181B oversamples the CVBS by a factor of 2 and the Chroma/PrPb
by a factor of 4. A decimating filter (CAA) is used to
preserve the active video band and to remove any out-ofband components. The CAA filter has a fixed response.
•
04984-012
–60
B
SO
AMPLITUDE (dB)
LE
Figure 11. Y S-VHS Combined Responses
Data from the digital fine clamp block is processed by three sets
of filters. The data format at this point is CVBS for CVBS
inputs, chroma only for Y/C, or U/V interleaved for YPrPb
input formats.
Figure 13. Pal Notch Filter Response
Rev. B | Page 28 of 100
ADV7181B
CSFM[2:0] C Shaping Filter Mode, Address 0x17[7]
GAIN OPERATION
The C shaping filter mode bits allow the user to select from a
range of low-pass filters, SH1 to SH5 and wideband mode, for
the chrominance signal. The autoselection options automatically select from the filter options to give the specified response;
see settings 000 and 001 in Table 31.
The gain control within the ADV7181B is done on a purely
digital basis. The input ADCs support a 9-bit range, mapped
into a 1.6 V analog voltage range. Gain correction takes place
after the digitization in the form of a digital multiplier.
Table 31. CSFM Function
Description
Autoselect 1.5 MHz bandwidth
Autoselect 2.17 MHz bandwidth
SH1
SH2
SH3
SH4
SH5
Wideband mode
As shown in Figure 16, the ADV7181B can decode a video
signal as long as it fits into the ADC window. The components
to this are the amplitude of the input signal and the dc level it
resides on. The dc level is set by the clamping circuitry (see the
Clamp Operation section).
TE
CSFM[2:0]
000 (default)
001
010
011
100
101
110
111
If the amplitude of the analog video signal is too high, clipping
can occur, resulting in visual artifacts. The analog input range
of the ADC, together with the clamp level, determines the
maximum supported amplitude of the video signal.
COMBINED C ANTIALIAS, C SHAPING FILTER,
C RESAMPLER
LE
0
The minimum supported amplitude of the input video is
determined by the ADV7181B’s ability to retrieve horizontal
and vertical timing and to lock to the color burst, if present.
–10
–20
–30
–60
0
1
2
3
4
FREQUENCY (MHz)
5
6
Figure 15. Chroma Shaping Filter Responses
O
Figure 15 shows the responses of SH1 (narrowest) to SH5
(widest) in addition to the wideband mode (in red).
There are separate gain control units for luma and chroma data.
Both can operate independently of each other. The chroma unit,
however, can also take its gain value from the luma path.
The possible AGC modes are summarized in Table 32.
It is possible to freeze the automatic gain control loops. This
causes the loops to stop updating. It also causes the AGC
determined gain at the time of the freeze to stay active until the
loop is either unfrozen or the gain mode of operation is
changed.
The currently active gain from any of the modes can be read
back. Refer to the description of the dual-function manual gain
registers, LG[11:0] Luma Gain and CG[11:0] Chroma Gain, in
the Luma Gain and the Chroma Gain sections.
ANALOG VOLTAGE
RANGE SUPPORTED BY ADC (1.6V RANGE FOR ADV7181B)
MAXIMUM
VOLTAGE
SDP
(GAIN SELECTION ONLY)
ADC
DATA PREPROCESSOR
(DPP)
GAIN
CONTROL
MINIMUM
VOLTAGE
CLAMP
LEVEL
Figure 16. Gain Control Overview
Rev. B | Page 29 of 100
04984-016
–50
04984-015
–40
B
SO
ATTENUATION (dB)
Advantages of this architecture over the commonly used
programmable gain amplifier (PGA) before the ADC include
the fact that the gain is now completely independent of supply,
temperature, and process variations.
ADV7181B
Table 32. AGC Modes
Input Video Type
Any
CVBS
Luma Gain
Manual gain luma
Dependent on horizontal sync depth
Chroma Gain
Manual gain chroma
Dependent on color burst amplitude;
taken from luma path
Dependent on color burst amplitude;
taken from luma path
Dependent on color burst amplitude;
taken from luma path
Dependent on color burst amplitude;
taken from luma path
Taken from luma path
Peak white
Y/C
Dependent on horizontal sync depth
Peak white
Dependent on horizontal sync depth
Luma Gain
LAGC[2:0] Luma Automatic Gain Control,
Address 0x2C[7:0]
Table 34. LAGT Function
There are ADI internal parameters to customize the peak white
gain control. Contact ADI sales for more information.
010 (default)
011
100
101
110
111
Description
Manual fixed gain (use LMG[11:0])
AGC (blank level to sync tip); peak white
algorithm off
AGC (blank level to sync tip); peak white
algorithm on
Reserved
Reserved
Reserved
Reserved
Freeze gain
Description
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
LG[11:0] Luma Gain, Address 0x2F[3:0];
Address 0x30[7:0]; LMG[11:0] Luma Manual Gain,
Address 0x2F[3:0]; Address 0x30[7:0]
Luma gain[11:0] is a dual-function register. If written to, a
desired manual luma gain can be programmed. This gain
becomes active if the LAGC[2:0] mode is switched to manual
fixed gain. Equation 1 shows how to calculate a desired gain.
B
SO
LAGC[2:0]
000
001
LAGT[1:0]
00
01
10
11 (default)
LE
The luma automatic gain control mode bits select the mode of
operation for the gain control in the luma path.
Table 33. LAGC Function
TE
YPrPb
If read back, this register returns the current gain value.
Depending on the setting in the LAGC[2:0] bits, one of these
gain values is returned:
LAGT[1:0] Luma Automatic Gain Timing,
Address 0x2F[7:6]
O
The luma automatic gain timing register allows the user to
influence the tracking speed of the luminance automatic gain
control. This register only has an effect if the LAGC[2:0]
register is set to 001, 010, 011, or 100 (automatic gain control
modes).
•
Luma manual gain value (LAGC[2:0] set to luma manual
gain mode)
•
Luma automatic gain value (LAGC[2:0] set to any of the
automatic modes)
Table 35. LG/LMG Function
LG[11:0]/LMG[11:0]
LMG[11:0] = X
Read/Write
Write
LG[11:0]
Read
If peak white AGC is enabled and active (see the
STATUS_1[7:0] Address 0x10[7:0] section), the actual gain
update speed is dictated by the peak white AGC loop and, as a
result, the LAGT settings have no effect. As soon as the part
leaves peak white AGC, LAGT becomes relevant again.
The update speed for the peak white algorithm can be
customized by the use of internal parameters. Contact ADI
sales for more information.
Rev. B | Page 30 of 100
Luma _ Gain =
(0 < LG ≤ 4095)
2048
Description
Manual gain for luma
path
Actually used gain
= 0...2
(1)
ADV7181B
For example, program the ADV7181B into manual fixed gain
mode with a desired gain of 0.89.
Use Equation 1 to convert the gain:
0.89 × 2048 = 1822.72
2.
Truncate to integer value:
1822.72 = 1822
3.
Convert to hexadecimal:
1822d = 0x71E
4.
Split into two registers and program:
Luma Gain Control 1[3:0] = 0x7
Luma Gain Control 2[7:0] = 0x1E
5.
Setting PW_UPD to 0 updates the gain once per video line.
Setting PW_UPD to 1 (default) updates the gain once per field.
Chroma Gain
CAGC[1:0] Chroma Automatic Gain Control,
Address 0x2C[1:0]
Enable manual fixed gain mode:
Set LAGC[2:0] to 000
BETCAM Enable Betacam Levels, Address 0x01[5]
SETADC_sw_man_en, Manual Input Muxing Enable,
Address C4[7] to find how component video (YPrPb) can
be routed through the ADV7181B.
•
Video Standard Selection to select the various standards,
for example, with and without pedestal.
B
SO
•
The automatic gain control (AGC) algorithms adjust the levels
based on the setting of the BETACAM bit (see Table 36).
Table 36. BETACAM Function
Description
Assuming YPrPb is selected as input format
Selecting PAL with pedestal selects MII
Selecting PAL without pedestal selects SMPTE
Selecting NTSC with pedestal selects MII
Selecting NTSC without pedestal selects SMPTE
Assuming YPrPb is selected as input format
Selecting PAL with pedestal selects BETACAM
Selecting PAL without pedestal selects BETACAM
variant
Selecting NTSC with pedestal selects BETACAM
Selecting NTSC without pedestal selects BETACAM
variant
O
BETACAM
0 (default)
1
The two bits of color automatic gain control mode select the
basic mode of operation for automatic gain control in the
chroma path.
Table 37. CAGC Function
LE
If YPrPb data is routed through the ADV7181B, the automatic
gain control modes can target different video input levels, as
outlined in Table 39. The BETACAM bit is valid only if the
input mode is YPrPb (component). The BETACAM bit
basically sets the target value for AGC operation.
A review of the following sections is useful:
The peak white and average video algorithms determine the
gain based on measurements taken from the active video. The
PW_UPD bit determines the rate of gain change. LAGC[2:0]
must be set to the appropriate mode to enable the peak white or
average video mode in the first place. For more information,
refer to the LAGC[2:0] Luma Automatic Gain Control,
Address 0x2C[7:0] section.
TE
1.
PW_UPD Peak White Update, Address 0x2B[0]
CAGC[1:0]
00
01
10 (default)
11
Description
Manual fixed gain (use CMG[11:0])
Use luma gain for chroma
Automatic gain (based on color burst)
Freeze chroma gain
CAGT[1:0] Chroma Automatic Gain Timing,
Address 0x2D[7:6]
The chroma automatic gain timing register allows the user to
influence the tracking speed of the chroma automatic gain
control. This register has an effect only if the CAGC[1:0]
register is set to 10 (automatic gain).
Table 38. CAGT Function
CAGT[1:0]
00
01
10
11 (default)
Description
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
Table 39. Betacam Levels
Name
Y Range
Pb and Pr Range
Sync Depth
Betacam (mV)
0 to 714 (includes 7.5% pedestal)
–467 to +467
286
Betacam Variant (mV)
0 to 714
–505 to +505
286
Rev. B | Page 31 of 100
SMPTE (mV)
0 to 700
–350 to +350
300
MII (mV)
0 to 700 (includes 7.5% pedestal)
–324 to +324
300
ADV7181B
CG[11:0] Chroma Gain, Address 0x2D[3:0];
Address 0x2E[7:0]; CMG[11:0] Chroma Manual Gain,
Address 0x2D[3:0]; Address 0x2E[7:0]
CKILLTHR[2:0] Color Kill Threshold,
Address 0x3D[6:4]
Chroma gain[11:0] is a dual-function register. If written to, a
desired manual chroma gain can be programmed. This gain
becomes active if the CAGC[1:0] mode is switched to manual
fixed gain. Refer to Equation 2 for calculating a desired gain.
If read back, this register returns the current gain value.
Depending on the setting in the CAGC[1:0] bits, this is either
•
Chroma manual gain value (CAGC[1:0] set to chroma
manual gain mode).
•
Chroma automatic gain value (CAGC[1:0] set to any of the
automatic modes).
Read
Chroma _ Gain =
(0 < CG ≤ 4095)
1024
= 0...4
Description
SECAM
NTSC, PAL
No color kill
Kill at <0.5%
Kill at <5%
Kill at <1.5%
Kill at <7%
Kill at <2.5%
Kill at <8%
Kill at <4.0%
Kill at <9.5%
Kill at <8.5%
Kill at <15%
Kill at <16.0%
Kill at <32%
Kill at <32.0%
Reserved for ADI internal use only. Do not select.
TE
CG[11:0]
Description
Manual gain for chroma
path
Currently active gain
CKILLTHR[2:0]
000
001
010
011
100 (default)
101
110
111
LE
Read/Write
Write
To enable the color kill function, the CKE bit must be set. For
settings 000, 001, 010, and 011, chroma demodulation inside
the ADV7181B may not work satisfactorily for poor input video
signals.
Table 41. CKILLTHR Function
Table 40. CG/CMG Function
CG[11:0]/CMG[11:0]
CMG[11:0]
The CKILLTHR[2:0] bits allow the user to select a threshold for
the color kill function. The threshold applies to only QAMbased (NTSC and PAL) or FM-modulated (SECAM) video
standards.
(2)
CHROMA TRANSIENT IMPROVEMENT (CTI)
The signal bandwidth allocated for chroma is typically much
smaller than that of luminance. In the past, this was a valid way
to fit a color video signal into a given overall bandwidth because
the human eye is less sensitive to chrominance than to
luminance.
B
SO
For example, freezing the automatic gain loop and reading back
the CG[11:0] register results in a value of 0x47A.
Convert the readback value to decimal
0x47A = 1146d
2.
Apply Equation 2 to convert the readback value
1146/1024 = 1.12
CKE Color Kill Enable, Address 0x2B[6]
The color kill enable bit allows the optional color kill function
to be switched on or off.
O
For QAM-based video standards (PAL and NTSC) and FMbased systems (SECAM), the threshold for the color kill
decision is selectable via the CKILLTHR[2:0] bits.
If color kill is enabled, and if the color carrier of the incoming
video signal is less than the threshold for 128 consecutive video
lines, color processing is switched off (black and white output).
To switch the color processing back on, another 128 consecutive
lines with a color burst greater than the threshold are required.
The color kill option works only for input signals with a
modulated chroma part. For component input (YPrPb), there is
no color kill.
The uneven bandwidth, however, can lead to visual artifacts in
sharp color transitions. At the border of two bars of color, both
components (luma and chroma) change at the same time (see
Figure 17). Due to the higher bandwidth, the signal transition
of the luma component is usually much sharper than that of the
chroma component. The color edge is not sharp but blurred, in
the worst case, over several pixels.
LUMA SIGNAL
DEMODULATED
CHROMA SIGNAL
Setting CKE to 0 disables color kill.
Setting CKE to 1 (default) enables color kill.
Rev. B | Page 32 of 100
LUMA SIGNAL WITH A
TRANSITION, ACCOMPANIED
BY A CHROMA TRANSITION
ORIGINAL, SLOW CHROMA
TRANSITION PRIOR TO CTI
SHARPENED CHROMA
TRANSITION AT THE
OUTPUT OF CTI
Figure 17. CTI Luma/Chroma Transition
04984-017
1.
ADV7181B
The chroma transient improvement block examines the input
video data. It detects transitions of chroma, and can be
programmed to steepen the chroma edges in an attempt to
artificially restore lost color bandwidth. The CTI block,
however, operates only on edges above a certain threshold to
ensure that noise is not emphasized. Care has been taken to
ensure that edge ringing and undesirable saturation or hue
distortion are avoided.
Chroma transient improvements are needed primarily for
signals that experienced severe chroma bandwidth limitations.
For those types of signals, it is strongly recommended to enable
the CTI block via CTI_EN.
CTI_EN Chroma Transient Improvement Enable,
Address 0x4D[0]
The CTI_C_TH[7:0] value is an unsigned, 8-bit number specifying how big the amplitude step in a chroma transition must be
to be steepened by the CTI block. Programming a small value
into this register causes even smaller edges to be steepened by
the CTI block. Making CTI_C_TH[7:0] a large value causes the
block to improve large transitions only.
The default value for CTI_C_TH[7:0] is 0x08, indicating the
threshold for the chroma edges prior to CTI.
DIGITAL NOISE REDUCTION (DNR)
TE
Digital noise reduction is based on the assumption that high
frequency signals with low amplitude are probably noise and
that their removal, therefore, improves picture quality.
Setting CTI_EN to 0 disables the CTI block.
DNR_EN Digital Noise Reduction Enable,
Address 0x4D[5]
Setting CTI_EN to 1 (default) enables the CTI block.
The DNR_EN bit enables the DNR block or bypasses it.
LE
CTI_AB_EN Chroma Transient Improvement
Alpha Blend Enable, Address 0x4D[1]
CTI_C_TH[7:0] CTI Chroma Threshold,
Address 0x4E[7:0]
The CTI_AB_EN bit enables an alpha-blend function within
the CTI block. If set to 1, the alpha blender mixes the transient
improved chroma with the original signal. The sharpness of the
alpha blending can be configured via the CTI_AB[1:0] bits.
Setting DNR_EN to 0 bypasses DNR (disables it).
Setting DNR_EN to 1 (default) enables digital noise reduction
on the luma data.
DNR_TH[7:0] DNR Noise Threshold, Address 0x50[7:0]
For the alpha blender to be active, the CTI block must be
enabled via the CTI_EN bit.
CTI_AB[1:0] Chroma Transient Improvement Alpha
Blend, Address 0x4D[3:2]
Programming a small value causes only small transients to be
seen as noise and to be removed.
B
SO
Setting CTI_AB_EN to 1 (default) enables the CTI alpha-blend
mixing function.
The DNR_TH[7:0] value is an unsigned 8-bit number used to
determine the maximum edge that is interpreted as noise and
therefore blanked from the luma data. Programming a large
value into DNR_TH[7:0] causes the DNR block to interpret
even large transients as noise and remove them. The effect on
the video data is, therefore, more visible.
Setting CTI_AB_EN to 0 disables the CTI alpha blender.
O
The CTI_AB[1:0] controls the behavior of alpha blend circuitry
that mixes the sharpened chroma signal with the original one. It
thereby controls the visual impact of CTI on the output data.
For CTI_AB[1:0] to become active, the CTI block must be
enabled via the CTI_EN bit, and the alpha blender must be
switched on via CTI_AB_EN.
The default value for DNR_TH[7:0] is 0x08, indicating the
threshold for maximum luma edges to be interpreted as noise.
Sharp blending maximizes the effect of CTI on the picture, but
can also increase the visual impact of small amplitude, high
frequency chroma noise.
Table 42. CTI_AB Function
CTI_AB[1:0]
00
01
10
11 (default)
The recommended DNR_TH[7:0] setting for A/V inputs is
0x04, and the recommended DNR_TH[7:0] setting for tuner
inputs is 0x0A.
Description
Sharpest mixing between sharpened and original
chroma signal
Sharp mixing
Smooth mixing
Smoothest alpha blend function
COMB FILTERS
The comb filters of the ADV7181B have been greatly improved
to automatically handle video of all types, standards, and levels
of quality. The NTSC and PAL configuration registers allow the
user to customize comb filter operation, depending on which
video standard is detected (by autodetection) or selected (by
manual programming). In addition to the bits listed in this
section, there are other ADI internal controls; contact ADI sales
for more information.
NTSC Comb Filter Settings
Used for NTSC-M/J CVBS inputs.
Rev. B | Page 33 of 100
ADV7181B
NSFSEL[1:0] Split Filter Selection NTSC,
Address 0x19[3:2]
CTAPSN[1:0] Chroma Comb Taps NTSC,
Address 0x38[7:6]
The NSFSEL[1:0] control selects how much of the overall signal
bandwidth is fed to the combs. A narrow split filter selection
gives better performance on diagonal lines, but leaves more dot
crawl in the final output image. The opposite is true for selecting
a wide bandwidth split filter.
Table 44. CTAPSN Function
Table 43. NSFSEL Function
Description
Narrow
Medium
Medium
Wide
10 (default)
11
CCMN[2:0] Chroma Comb Mode NTSC, Address 0x38[5:3]
Table 45. CCMN Function
Description
Adaptive comb mode
Configuration
Adaptive 3-line chroma comb for CTAPSN = 01
Adaptive 4-line chroma comb for CTAPSN = 10
Adaptive 5-line chroma comb for CTAPSN = 11
100
101
Disable chroma comb
Fixed chroma comb (top lines of line memory)
110
Fixed chroma comb (all lines of line memory)
111
Fixed chroma comb (bottom lines of line memory)
B
SO
LE
CCMN[2:0]
0xx (default)
Description
Do not use
NTSC chroma comb adapts 3 lines (3 taps) to 2
lines (2 taps)
NTSC chroma comb adapts 5 lines (5 taps) to 3
lines (3 taps)
NTSC chroma comb adapts 5 lines (5 taps) to 4
lines (4 taps)
TE
NSFSEL[1:0]
00 (default)
01
10
11
CTAPSN[1:0]
00
01
Fixed 2-line chroma comb for CTAPSN = 01
Fixed 3-line chroma comb for CTAPSN = 10
Fixed 4-line chroma comb for CTAPSN = 11
Fixed 3-line chroma comb for CTAPSN = 01
Fixed 4-line chroma comb for CTAPSN = 10
Fixed 5-line chroma comb for CTAPSN = 11
Fixed 2-line chroma comb for CTAPSN = 01
Fixed 3-line chroma comb for CTAPSN = 10
Fixed 4-line chroma comb for CTAPSN = 11
YCMN[2:0] Luma Comb Mode NTSC, Address 0x38[2:0]
Table 46. YCMN Function
Description
Adaptive comb mode
Disable luma comb
Fixed luma comb (top lines of line memory)
Fixed luma comb (all lines of line memory)
Fixed luma comb (bottom lines of line memory)
O
YCMN[2:0]
0xx (default)
100
101
110
111
Configuration
Adaptive 3-line (3 taps) luma comb
Use low-pass/notch filter; see the Y-Shaping Filter section
Fixed 2-line (2 taps) luma comb
Fixed 3-line (3 taps) luma comb
Fixed 2-line (2 taps) luma comb
Table 47. PSFSEL Function
PAL Comb Filter Settings
Used for PAL-B/G/H/I/D, PAL-M, PAL-combinational N,
PAL-60, and NTSC443 CVBS inputs.
PSFSEL[1:0] Split Filter Selection PAL, Address 0x19[1:0]
The PSFSEL[1:0] control selects how much of the overall signal
bandwidth is fed to the combs. A wide split filter selection
eliminates dot crawl, but shows imperfections on diagonal lines.
The opposite is true for selecting a narrow bandwidth split filter.
PSFSEL[1:0]
00
01 (default)
10
11
Rev. B | Page 34 of 100
Description
Narrow
Medium
Wide
Widest
ADV7181B
CTAPSP[1:0] Chroma Comb Taps PAL, Address 0x39[7:6]
Table 48. CTAPSP Function
CTAPSP[1:0]
00
01
Description
Do not use
PAL chroma comb adapts 5 lines (3 taps) to
3 lines (2 taps); cancels cross luma only
PAL chroma comb adapts 5 lines (5 taps) to
3 lines (3 taps); cancels cross luma and hue error less well
PAL chroma comb adapts 5 lines (5 taps) to
4 lines (4 taps); cancels cross luma and hue error well
10
11 (default)
Table 49. CCMP Function
Description
Adaptive comb mode
Configuration
Adaptive 3-line chroma comb for CTAPSP = 01
Adaptive 4-line chroma comb for CTAPSP = 10
Adaptive 5-line chroma comb for CTAPSP = 11
100
101
Disable chroma comb
Fixed chroma comb (top lines of line memory)
110
Fixed chroma comb (all lines of line memory)
111
Fixed chroma comb (bottom lines of line memory)
Fixed 2-line chroma comb for CTAPSP = 01
Fixed 3-line chroma comb for CTAPSP = 10
Fixed 4-line chroma comb for CTAPSP = 11
Fixed 3-line chroma comb for CTAPSP = 01
Fixed 4-line chroma comb for CTAPSP = 10
Fixed 5-line chroma comb for CTAPSP = 11
Fixed 2-line chroma comb for CTAPSP = 01
Fixed 3-line chroma comb for CTAPSP = 10
Fixed 4-line chroma comb for CTAPSP = 11
B
SO
LE
CCMP[2:0]
0xx (default)
TE
CCMP[2:0] Chroma Comb Mode PAL, Address 0x39[5:3]
YCMP[2:0] Luma Comb Mode PAL, Address 0x39[2:0]
Table 50. YCMP Function
Description
Adaptive comb mode.
Disable luma comb
Fixed luma comb (top lines of line memory)
Fixed luma comb (all lines of line memory)
Fixed luma comb (bottom lines of line memory)
Configuration
Adaptive 5 lines (3 taps) luma comb
Use low-pass/notch filter; see the Y-Shaping Filter section
Fixed 3 lines (2 taps) luma comb
Fixed 5 lines (3 taps) luma comb
Fixed 3 lines (2 taps) luma comb
O
YCMP[2:0]
0xx (default)
100
101
110
111
Rev. B | Page 35 of 100
ADV7181B
AV CODE INSERTION AND CONTROLS
This section describes the I2C-based controls that affect:
•
Insertion of AV codes into the data stream.
•
Data blanking during the vertical blank interval (VBI).
•
The range of data values permitted in the output data
stream.
•
The relative delay of luma vs. chroma signals.
In this output interface mode, the following assignment takes
place: Cb = FF, Y = 00, Cr = 00, and Y = AV.
In a 16-bit output interface where Y and Cr/Cb are delivered via
separate data buses, the AV code is over the whole 16 bits. The
SD_DUP_AV bit allows the user to replicate the AV codes on
both busses, so the full AV sequence can be found on the Y bus
and on the Cr/Cb bus. See Figure 18.
When SD_DUP_AV is 0 (default), the AV codes are in single
fashion (to suit 8-bit interleaved data output).
Some of the decoded VBI data is being inserted during the
horizontal blanking interval. See the Gemstar Data Recovery
section for more information.
TE
When SD_DUP_AV is 1, the AV codes are duplicated (for
16-bit interfaces).
BT656-4 ITU Standard BT-R.656-4 Enable, Address 0x04[7]
VBI_EN Vertical Blanking Interval Data Enable,
Address 0x03[7]
The ITU has changed the position for toggling of the V bit
within the SAV EAV codes for NTSC between Revision 3 and
Revision 4. The BT656-4 standard bit allows the user to select
an output mode that is compliant with either the previous or the
new standard. For more information, review the standard at
www.itu.int.
LE
The VBI enable bit allows data such as intercast and closed
caption data to be passed through the luma channel of the
decoder with a minimal amount of filtering. All data for Line 1
to Line 21 is passed through and available at the output port.
The ADV7181B does not blank the luma data, and automatically switches all filters along the luma data path into their
widest bandwidth. For active video, the filter settings for YSH
and YPK are restored.
The standard change affects NTSC only and has no bearing on
PAL.
When BT656-4 is 0 (default), the BT656-3 specification is used.
The V bit goes low at EAV of Line 10 and Line 273.
B
SO
Refer to the BL_C_VBI Blank Chroma during VBI section for
information on the chroma path.
When BT656-4 is 1, the BT656-4 specification is used. The
V bit goes low at EAV of Line 20 and Line 283.
When VBI_EN is 0 (default), all video lines are filtered/scaled.
SD_DUP_AV Duplicate AV Codes, Address 0x03[0]
When VBI_EN is 1, only the active video region is
filtered/scaled.
Depending on the output interface width, it can be necessary to
duplicate the AV codes from the luma path into the chroma path.
In an 8-bit-wide output interface (Cb/Y/Cr/Y interleaved data),
the AV codes are defined as FF/00/00/AV, with AV being the
transmitted word that contains information about H/V/F.
16-BIT INTERFACE
SD_DUP_AV = 0
16-BIT INTERFACE
Y DATA BUS
FF
00
00
AV
Y
00
AV
Y
Cr/Cb DATA BUS
FF
00
00
AV
Cb
FF
00
Cb
8-BIT INTERFACE
Cb/Y/Cr/Y
INTERLEAVED
FF
00
00
AV
AV CODE SECTION
AV CODE SECTION
AV CODE SECTION
Figure 18. AV Code Duplication Control
Rev. B | Page 36 of 100
Cb
04984-018
O
SD_DUP_AV = 1
ADV7181B
BL_C_VBI Blank Chroma During VBI, Address 0x04[2]
LTA[1:0] Luma Timing Adjust, Address 0x27[1:0]
Setting BL_C_VBI high, the Cr and Cb values of all VBI lines
are blanked. This is done so any data that may arrive during
VBI is not decoded as color and output through Cr and Cb.
As a result, it is possible to send VBI lines into the decoder,
then output them through an encoder again, undistorted.
Without this blanking, any wrongly decoded color is encoded
by the video encoder; therefore, the VBI lines are distorted.
The luma timing adjust register allows the user to specify a
timing difference between chroma and luma samples.
Setting BL_C_VBI to 0 decodes and outputs color during VBI.
Setting BL_C_VBI to 1 (default) blanks Cr and Cb values
during VBI.
CVBS input LTA[1:0] = 00
•
YC input LTA[1:0] = 01
•
YPrPb input LTA[1:0] =01
TE
LTA[1:0]
00 (default)
01
10
11
Description
No delay
Luma 1 clk (37 ns) delayed
Luma 2 clk (74 ns) early
Luma 1 clk (37 ns) early
CTA[2:0] Chroma Timing Adjust, Address 0x27[5:3]
LE
AV codes (as per ITU-R BT-656, formerly known as CCIR-656)
consist of a fixed header made up of 0xFF and 0x00 values.
These two values are reserved and therefore are not to be used
for active video. Additionally, the ITU specifies that the nominal range for video should be restricted to values between 16
and 235 for luma and 16 to 240 for chroma.
The RANGE bit allows the user to limit the range of values
output by the ADV7181B to the recommended value range. In
any case, it ensures that the reserved values of 255d (0xFF) and
00d (0x00) are not presented on the output pins unless they are
part of an AV code header.
B
SO
Table 51. RANGE Function
16 ≤ Y ≤ 235
1 ≤ Y ≤ 254
•
Table 52. LTA Function
RANGE Range Selection, Address 0x04[0]
RANGE
0
1 (default)
There is a certain functionality overlap with the CTA[2:0]
register. For manual programming, use the following defaults:
Description
16 ≤ C/P ≤ 240
1 ≤ C/P ≤ 254
AUTO_PDC_EN Automatic Programmed Delay Control,
Address 0x27[6]
O
Enabling the AUTO_PDC_EN function activates a function
within the ADV7181B that automatically programs the
LTA[1:0] and CTA[2:0] to have the chroma and luma data
match delays for all modes of operation. If set, manual registers
LTA[1:0] and CTA[2:0] are not used. If the automatic mode is
disabled (via setting the AUTO_PDC_EN bit to 0), the values
programmed into LTA[1:0] and CTA[2:0] registers become
active.
When AUTO_PDC_EN is 0, the ADV7181B uses the LTA[1:0]
and CTA[2:0] values for delaying luma and chroma samples.
Refer to the LTA[1:0] Luma Timing Adjust, Address 0x27[1:0]
and the CTA[2:0] Chroma Timing Adjust, Address 0x27[5:3]
sections.
When AUTO_PDC_EN is 1 (default), the ADV7181B
automatically determines the LTA and CTA values to have luma
and chroma aligned at the output.
The chroma timing adjust register allows the user to specify a
timing difference between chroma and luma samples. This can
be used to compensate for external filter group delay differences
in the luma vs. chroma path, and to allow a different number of
pipeline delays while processing the video downstream. Review
this functionality together with the LTA[1:0] register.
The chroma can be delayed/advanced only in chroma pixel
steps. One chroma pixel step is equal to two luma pixels. The
programmable delay occurs after demodulation, where one can
no longer delay by luma pixel steps.
For manual programming, use the following defaults:
•
CVBS input CTA[2:0] = 011
•
YC input CTA[2:0] = 101
•
YPrPb input CTA[2:0] =110
Table 53. CTA Function
CTA[2:0]
000
001
010
011 (default)
100
101
110
111
Rev. B | Page 37 of 100
Description
Not used
Chroma + 2 chroma pixel (early)
Chroma + 1 chroma pixel (early)
No delay
Chroma – 1 chroma pixel (late)
Chroma – 2 chroma pixel (late)
Chroma – 3 chroma pixel (late)
Not used
ADV7181B
SYNCHRONIZATION OUTPUT SIGNALS
HSE[10:0] HS End, Address 0x34[2:0], Address 0x36[7:0]
HS Configuration
The position of this edge is controlled by placing a binary
number into HSE[10:0]. The number applied offsets the edge
with respect to an internal counter that is reset to 0 immediately
after EAV Code FF, 00, 00, XY (see Figure 19). HSE is set to
00000000000b, which is 0 LLC1 clock cycles from Count[0].
The following controls allow the user to configure the behavior
of the HS output pin only:
•
Beginning of HS signal via HSB[10:0]
•
End of HS signal via HSE[10:0]
•
Polarity of HS using PHS
The default value of HSE[10:0] is 000, indicating that the HS
pulse ends zero pixels after a falling edge of HS.
For example
The HS begin and HS end registers allow the user to freely
position the HS output (pin) within the video line. The values
in HSB[10:0] and HSE[10:0] are measured in pixel units from
the falling edge of HS. Using both values, the user can program
both the position and length of the HS output signal.
2.
HSB[10:0] HS Begin, Address 0x34[6:4],
Address 0x35[7:0]
To shift the HS away from active video by 20 LLC1s, add
1696 LLC1s to both HSB and HSE (for NTSC), that is,
HSB[10:0] = [11010100010], HSE[10:0] = [11010100000].
1696 is derived from the NTSC total number of pixels =
1716.
LE
The position of this edge is controlled by placing a binary
number into HSB[10:0]. The number applied offsets the edge
with respect to an internal counter that is reset to 0 immediately
after EAV Code FF, 00, 00, XY (see Figure 19). HSB is set to
00000000010b, which is 2 LLC1 clock cycles from Count[0].
To shift the HS toward active video by 20 LLC1s, add
20 LLC1s to both HSB and HSE, that is, HSB[10:0] =
[00000010110], HSE[10:0] = [00000010100].
TE
1.
The default value of HSB[10:0] is 0x002, indicating that the HS
pulse starts two pixels after the falling edge of HS.
To move 20 LLC1s away from active video is equal to subtracting
20 from 1716 and adding the result in binary to both HSB[10:0]
and HSE[10:0].
PHS Polarity HS, Address 0x37[7]
B
SO
The polarity of the HS pin can be inverted using the PHS bit.
When PHS is 0 (default), HS is active high.
When PHS is 1, HS is active low.
Table 54. HS Timing Parameters (see Figure 19)
Characteristic
HS to Active Video
(LLC1 Clock Cycles)
(C in Figure 19) (Default)
272
276
284
HS End Adjust
(HSE[10:0])
(Default)
00000000000b
00000000000b
00000000000b
O
Standard
NTSC
NTSC Square Pixel
PAL
HS Begin Adjust
(HSB[10:0])
(Default)
00000000010b
00000000010b
00000000010b
Active Video
Samples/Line
(D in Figure 19)
720Y + 720C = 1440
640Y + 640C = 1280
720Y + 720C = 1440
Total LLC1
Clock Cycles
(E in Figure 19)
1716
1560
1728
LLC1
PIXEL
BUS
Cr
ACTIVE
VIDEO
Y
FF
00
00
XY
80
10
80
10
EAV
80
10
FF
00
H BLANK
00
SAV
XY
Cb
Y
Cr
Y
Cb
Y
Cr
ACTIVE VIDEO
HS
HSB[10:0]
C
D
E
D
E
Figure 19. HS Timing
Rev. B | Page 38 of 100
04984-019
HSE[10:0]
4 LLC1
ADV7181B
VS and FIELD Configuration
The following controls allow the user to configure the behavior
of the VS and FIELD output pins, as well as the generation of
embedded AV codes:
•
ADV encoder-compatible signals via NEWAVMODE
•
PVS, PF
•
HVSTIM
•
VSBHO, VSBHE
•
VSEHO, VSEHE
When VSBHO is 1, the VS pin changes state at the start of a line
(odd field).
•
NVBEGDELO, NVBEGDELE, NVBEGSIGN,
NVBEG[4:0]
•
NVENDDELO, NVENDDELE, NVENDSIGN,
NVEND[4:0]
•
NFTOGDELO, NFTOGDELE, NFTOGSIGN,
NFTOG[4:0]
VSBHE VS Begin Horizontal Position Even,
Address 0x32[6]
TE
For NTSC control
The VSBHO and VSBHE bits select the position within a line at
which the VS pin (not the bit in the AV code) becomes active.
Some follow-on chips require the VS pin to only change state
when HS is high/low.
When VSBHE is 0 (default), the VS pin goes high at the middle
of a line of video (even field).
LE
•
For PAL control
The VSBHO and VSBHE bits select the position within a line at
which the VS pin (not the bit in the AV code) becomes active.
Some follow-on chips require the VS pin to only change state
when HS is high/low.
When VSBHO is 0 (default), the VS pin goes high at the middle
of a line of video (odd field).
•
PVBEGDELO, PVBEGDELE, PVBEGSIGN,
PVBEG[4:0]
•
PVENDDELO, PVENDDELE, PVENDSIGN,
PVEND[4:0]
•
PFTOGDELO, PFTOGDELE, PFTOGSIGN,
PFTOG[4:0]
When VSBHE is 1, the VS pin changes state at the start of a line
(even field).
VSEHO VS End Horizontal Position Odd,
Address 0x33[7]
B
SO
•
VSBHO VS Begin Horizontal Position Odd,
Address 0x32[7]
NEWAVMODE New AV Mode, Address 0x31[4]
When NEWAVMODE is 0, EAV/SAV codes are generated to
suit ADI encoders. No adjustments are possible.
O
Setting NEWAVMODE to 1 (default) enables the manual position of the VSYNC, Field, and AV codes using Register 0x34 to
Register 0x37 and Register 0xE5 to Register 0xEA. Default
register settings are CCIR656 compliant; see Figure 20 for
NTSC and Figure 25 for PAL. For recommended manual user
settings, see Table 55 for NTSC and see Table 56 and Figure 26
for PAL.
HVSTIM Horizontal VS Timing, Address 0x31[3]
The HVSTIM bit allows the user to select where the VS signal is
asserted within a line of video. Some interface circuitry can
require VS to go low while HS is low.
When HVSTIM is 0 (default), the start of the line is relative
to HSE.
When HVSTIM is 1, the start of the line is relative to HSB.
The VSEHO and VSEHE bits select the position within a line at
which the VS pin (not the bit in the AV code) becomes active.
Some follow-on chips require the VS pin to only change state
when HS is high/low.
When VSEHO is 0 (default), the VS pin goes low (inactive) at
the middle of a line of video (odd field).
When VSEHO is 1, the VS pin changes state at the start of a line
(odd field).
VSEHE VS End Horizontal Position Even,
Address 0x33[6]
The VSEHO and VSEHE bits select the position within a line at
which the VS pin (not the bit in the AV code) becomes active.
Some follow-on chips require the VS pin to only change state
when HS is high/low.
When VSEHE is 0, the VS pin goes low (inactive) at the middle
of a line of video (even field).
When VSEHE is 1 (default), the VS pin changes state at the start
of a line (even field).
PVS Polarity VS, Address 0x37[5]
The polarity of the VS pin can be inverted using the PVS bit.
When PVS is 0 (default), VS is active high.
When PVS is 1, VS is active low.
Rev. B | Page 39 of 100
ADV7181B
When PF is 0 (default), FIELD is active high.
PF Polarity FIELD, Address 0x37[3]
When PF is 1, FIELD is active low.
The polarity of the FIELD pin can be inverted using the PF bit.
The FIELD pin can be inverted using the PF bit.
FIELD 1
525
1
2
3
4
5
6
7
8
9
10
11
12
13
19
20
21
22
OUTPUT
VIDEO
H
V
NVBEG[4:0] = 0x5
1BT.656-4
NVEND[4:0] = 0x4
NFTOG[4:0] = 0x3
FIELD 2
263
264
265
266
267
268
269
270
271
OUTPUT
VIDEO
273
274
275
276
LE
H
272
V
NVBEG[4:0] = 0x5
NFTOG[4:0] = 0x3
1APPLIES IF NEWAVMODE = 0:
284
285
1BT.656-4
NVEND[4:0] = 0x4
F
283
REG 0x04, BIT 7 = 1
04984-020
262
TE
REG 0x04, BIT 7 = 1
F
B
SO
MUST BE MANUALLY SHIFTED IF NEWAVMODE = 1.
Figure 20. NTSC Default (BT.656). The Polarity of H, V, and F is Embedded in the Data.
FIELD 1
525
OUTPUT
VIDEO
HS
OUTPUT
VS
OUTPUT
2
3
4
5
6
7
8
NVBEG[4:0] = 0x0
O
FIELD
OUTPUT
1
262
263
264
265
9
10
11
12
13
14
15
21
22
NVEND[4:0] = 0x3
NFTOG[4:0] = 0x5
FIELD 2
266
267
268
269
270
271
272
273
274
275
276
277
284
285
OUTPUT
VIDEO
HS
OUTPUT
VS
OUTPUT
NVBEG[4:0] = 0x0
NVEND[4:0] = 0x3
FIELD
OUTPUT
04984-021
NFTOG[4:0] = 0x5
Figure 21. NTSC Typical Vsync/Field Positions Using Register Writes in Table 55
Rev. B | Page 40 of 100
ADV7181B
Table 55. Recommended User Settings for NTSC (See Figure 21)
Register Name
Write
0x31
Vsync Field Control 1
0x1A
0x32
0x33
Vsync Field Control 2
Vsync Field Control 3
0x81
0x84
0x34
0x35
Hsync Pos. Control 1
Hsync Pos. Control 1
0x00
0x00
0x36
0x37
Hsync Pos. Control 1
Polarity
0x7D
0xA1
0xE5
0xE6
NTSV_V_Bit_Beg
NTSC_V_Bit_End
0x41
0x84
0xE7
NTSC_F_Bit_Tog
0x06
1
TE
Register
NVBEGSIGN
ADVANCE BEGIN OF
VSYNC BY NVBEG[4:0]
0
DELAY BEGIN OF
VSYNC BY NVBEG[4:0]
LE
NOT VALID FOR USER
PROGRAMMING
ODD FIELD?
YES
NO
NVBEGDELO
NVBEGDELE
0
1
ADDITIONAL
DELAY BY
1 LINE
ADDITIONAL
DELAY BY
1 LINE
VSBHO
VSBHE
1
0
0
ADVANCE BY
0.5 LINE
1
ADVANCE BY
0.5 LINE
O
VSYNC BEGIN
04984-022
0
B
SO
1
Figure 22. NTSC Vsync Begin
NVBEGDELO NTSC Vsync Begin Delay on Odd Field,
Address 0xE5[7]
NVBEGSIGN NTSC Vsync Begin Sign, Address 0xE5[5]
When NVBEGDELO is 0 (default), there is no delay.
Setting NVBEGSIGN to 0 delays the start of Vsync. Set for user
manual programming.
Setting NVBEGDELO to 1 delays Vsync going high on an odd
field by a line relative to NVBEG.
Setting NVBEGSIGN to 1 (default) advances the start of Vsync.
Not recommended for user programming.
NVBEGDELE NTSC Vsync Begin Delay on Even Field,
Address 0xE5[6]
NVBEG[4:0] NTSC Vsync Begin, Address 0xE5[4:0]
When NVBEGDELE is 0 (default), there is no delay.
The default value of NVBEG is 00101, indicating the NTSC
Vsync begin position.
Setting NVBEGDELE to 1 delays Vsync going high on an even
field by a line relative to NVBEG.
For all NTSC/PAL Vsync timing controls, both the V bit in the
AV code and the Vsync on the VS pin are modified.
Rev. B | Page 41 of 100
ADV7181B
1
NVENDSIGN
ADVANCE END OF
VSYNC BY NVEND[4:0]
0
DELAY END OF VSYNC
BY NVEND[4:0]
NOT VALID FOR USER
PROGRAMMING
ODD FIELD?
NO
NVENDDELO
NVENDDELE
1
0
0
1
ADDITIONAL
DELAY BY
1 LINE
LE
ADDITIONAL
DELAY BY
1 LINE
TE
YES
VSEHO
0
0
ADVANCE BY
0.5 LINE
B
SO
ADVANCE BY
0.5 LINE
1
VSYNC END
04984-023
1
VSEHE
Figure 23. NTSC Vsync End
NVENDDELO NTSC Vsync End Delay on Odd Field,
Address 0xE6[7]
NVEND NTSC[4:0] Vsync End, Address 0xE6[4:0]
The default value of NVEND is 00100, indicating the NTSC
Vsync end position.
Setting NVENDDELO to 1 delays Vsync from going low on an
odd field by a line relative to NVEND.
For all NTSC/PAL Vsync timing controls, both the V bit in the
AV code and the Vsync on the VS pin are modified.
NVENDDELE NTSC Vsync End Delay on Even Field,
Address 0xE6[6]
NFTOGDELO NTSC Field Toggle Delay on Odd Field,
Address 0xE7[7]
When NVENDDELE is set to 0 (default), there is no delay.
When NFTOGDELO is 0 (default), there is no delay.
Setting NVENDDELE to 1 delays Vsync from going low on an
even field by a line relative to NVEND.
Setting NFTOGDELO to 1 delays the field toggle/transition on
an odd field by a line relative to NFTOG.
NVENDSIGN NTSC Vsync End Sign, Address 0xE6[5]
NFTOGDELE NTSC Field Toggle Delay on Even Field,
Address 0xE7[6]
O
When NVENDDELO is 0 (default), there is no delay.
Setting NVENDSIGN to 0 (default) delays the end of Vsync. Set
for user manual programming.
Setting NVENDSIGN to 1 advances the end of Vsync. Not
recommended for user programming.
When NFTOGDELE is 0, there is no delay.
Setting NFTOGDELE to 1 (default) delays the field toggle/
transition on an even field by a line relative to NFTOG.
Rev. B | Page 42 of 100
ADV7181B
1
NFTOGSIGN
ADVANCE TOGGLE OF
FIELD BY NFTOG[4:0]
0
DELAY TOGGLE OF
FIELD BY NFTOG[4:0]
NOT VALID FOR USER
PROGRAMMING
ODD FIELD?
YES
NO
NFTOGDELO
NFTOGDELE
0
ADDITIONAL
DELAY BY
1 LINE
1
TE
0
ADDITIONAL
DELAY BY
1 LINE
LE
FIELD
TOGGLE
04984-024
1
Figure 24. NTSC Field Toggle
Table 56. Recommended User Settings for PAL (see Figure 26)
Register Name
Vsync Field Control 1
Vsync Field Control 2
Vsync Field Control 3
Hsync Pos. Control 1
Hsync Pos. Control 2
Hsync Pos. Control 3
Polarity
PAL_V_Bit_Beg
PAL_V_Bit_End
PAL_F_Bit_Tog
B
SO
Register
0x31
0x32
0x33
0x34
0x35
0x36
0x37
0xE8
0xE9
0xEA
Write
0x1A
0x81
0x84
0x00
0x00
0x7D
0xA1
0x41
0x84
0x06
NFTOG[4:0] NTSC Field Toggle, Address 0xE7[4:0]
Setting NFTOGSIGN to 0 delays the field transition. Set for
user manual programming.
The default value of NFTOG is 00011, indicating the NTSC
field toggle position.
Setting NFTOGSIGN to 1 (default) advances the field
transition. Not recommended for user programming.
For all NTSC/PAL field timing controls, both the F bit in the
AV code and the Field signal on the FIELD pin are modified.
O
NFTOGSIGN NTSC Field Toggle Sign, Address 0xE7[5]
Rev. B | Page 43 of 100
ADV7181B
FIELD 1
622
623
624
625
1
2
3
4
5
6
7
8
9
10
22
23
24
OUTPUT
VIDEO
H
V
PVBEG[4:0] = 0x5
PVEND[4:0] = 0x4
F
PFTOG[4:0] = 0x3
FIELD 2
310
311
312
313
314
315
316
317
318
319
320
321
322
335
336
337
TE
OUTPUT
VIDEO
H
V
PVEND[4:0] = 0x4
LE
PFTOG[4:0] = 0x3
04984-025
PVBEG[4:0] = 0x5
F
Figure 25. PAL Default (BT.656). The Polarity of H, V, and F is Embedded in the Data
FIELD 1
OUTPUT
VIDEO
HS
OUTPUT
VS
OUTPUT
FIELD
OUTPUT
623
624
625
1
2
3
4
5
6
B
SO
622
PVBEG[4:0] = 0x1
7
8
9
10
11
23
24
PVEND[4:0] = 0x4
PFTOG[4:0] = 0x6
FIELD 2
310
OUTPUT
VIDEO
312
313
O
HS
OUTPUT
311
314
315
316
317
318
319
320
321
322
323
336
337
VS
OUTPUT
PVBEG[4:0] = 0x1
PVEND[4:0] = 0x4
FIELD
OUTPUT
04984-026
PFTOG[4:0] = 0x6
Figure 26. PAL Typical Vsync/Field Positions Using Register Writes in Table 56
Rev. B | Page 44 of 100
ADV7181B
1
PVBEGSIGN
ADVANCE BEGIN OF
VSYNC BY PVBEG[4:0]
For all NTSC/PAL Vsync timing controls, both the V bit in the
AV code and the Vsync on the VS pin are modified.
0
DELAY BEGIN OF
VSYNC BY PVBEG[4:0]
1
PVENDSIGN
ADVANCE END OF
VSYNC BY PVEND[4:0]
NOT VALID FOR USER
PROGRAMMING
0
DELAY END OF VSYNC
BY PVEND[4:0]
ODD FIELD?
YES
NO
PVBEGDELO
PVBEGDELE
NOT VALID FOR USER
PROGRAMMING
ODD FIELD?
0
1
PVENDDELO
ADDITIONAL
DELAY BY
1 LINE
ADDITIONAL
DELAY BY
1 LINE
1
0
0
ADDITIONAL
DELAY BY
1 LINE
1
VSBHE
0
0
1
LE
VSBHO
VSEHO
ADVANCE BY
0.5 LINE
B
SO
VSYNC BEGIN
1
1
ADDITIONAL
DELAY BY
1 LINE
VSEHE
0
0
ADVANCE BY
0.5 LINE
04984-027
ADVANCE BY
0.5 LINE
PVENDDELE
1
ADVANCE BY
0.5 LINE
Figure 27. PAL Vsync Begin
VSYNC END
PVBEGDELO PAL Vsync Begin Delay on Odd Field,
Address 0xE8[7]
When PVBEGDELO is 0 (default), there is no delay.
Setting PVBEGDELO to 1 delays Vsync going high on an odd
field by a line relative to PVBEG.
O
PVBEGDELE PAL Vsync Begin Delay on Even Field,
Address 0xE8[6]
When PVBEGDELE is 0, there is no delay.
Setting PVBEGDELE to 1 (default) delays Vsync going high on
an even field by a line relative to PVBEG.
PVBEGSIGN PAL Vsync Begin Sign, Address 0xE8[5]
Setting PVBEGSIGN to 0 delays the beginning of Vsync. Set for
user manual programming.
04984-028
0
NO
TE
1
YES
Figure 28. PAL Vsync End
PVENDDELO PAL Vsync End Delay on Odd Field,
Address 0xE9[7]
When PVENDDELO is 0 (default), there is no delay.
Setting PVENDDELO to 1 delays Vsync going low on an odd
field by a line relative to PVEND.
PVENDDELE PAL Vsync End Delay on Even Field,
Address 0xE9[6]
When PVENDDELE is 0 (default), there is no delay.
Setting PVENDDELE to 1 delays Vsync going low on an even
field by a line relative to PVEND.
PVENDSIGN PAL Vsync End Sign, Address 0xE9[5]
Setting PVBEGSIGN to 1(default) advances the beginning of
Vsync. Not recommended for user programming.
Setting PVENDSIGN to 0 (default) delays the end of Vsync.
Set for user manual programming.
PVBEG[4:0] PAL Vsync Begin, Address 0xE8[4:0]
Setting PVENDSIGN to 1 advances the end of Vsync. Not
recommended for user programming.
The default value of PVBEG is 00101, indicating the PAL Vsync
begin position.
Rev. B | Page 45 of 100
ADV7181B
PVEND[4:0] PAL Vsync End, Address 0xE9[4:0]
SYNC PROCESSING
The default value of PVEND is 10100, indicating the PAL Vsync
end position.
The ADV7181B has two additional sync processing blocks that
postprocess the raw synchronization information extracted
from the digitized input video. If preferred, the blocks can be
disabled via the following two I2C bits.
For all NTSC/PAL Vsync timing controls, both the V bit in the
AV code and the Vsync on the VS pin are modified.
ENHSPLL Enable Hsync Processor, Address 0x01[6]
PFTOGDELO PAL Field Toggle Delay on Odd Field,
Address 0xEA[7]
The Hsync processor is designed to filter incoming Hsyncs that
have been corrupted by noise, providing improved performance
for video signals with stable time bases but poor SNR.
When PFTOGDELO is 0 (default), there is no delay.
Setting PFTOGDELO to 1 delays the F toggle/transition on an
odd field by a line relative to PFTOG.
Setting ENHSPLL to 0 disables the Hsync processor.
TE
Setting ENHSPLL to 1 (default) enables the Hsync processor.
PFTOGDELE PAL Field Toggle Delay on Even Field,
Address 0xEA[6]
ENVSPROC Enable Vsync Processor, Address 0x01[3]
When PFTOGDELE is 0, there is no delay.
This block provides extra filtering of the detected Vsyncs to give
improved vertical lock.
Setting PFTOGDELE to 1 (default) delays the F toggle/
transition on an even field by a line relative to PFTOG.
Setting ENVSPROC to 0 disables the Vsync processor.
Setting ENVSPROC to 1(default) enables the Vsync processor.
Setting PFTOGSIGN to 0 delays the field transition. Set for user
manual programming.
VBI DATA DECODE
LE
PFTOGSIGN PAL Field Toggle Sign, Address 0xEA[5]
Setting PFTOGSIGN to 1 (default) advances the field transition.
Not recommended for user programming.
•
B
SO
PFTOG PAL Field Toggle, Address 0xEA[4:0]
The following low data rate VBI signals can be decoded by the
ADV7181B:
The default value of PFTOG is 00011, indicating the PAL field
toggle position.
For all NTSC/PAL Field timing controls, the F bit in the AV
code and the field signal on the FIELD/DE pin are modified.
1
PFTOGSIGN
NOT VALID FOR USER
PROGRAMMING
ODD FIELD?
YES
NO
PFTOGDELO
PFTOGDELE
0
0
ADDITIONAL
DELAY BY
1 LINE
1
•
Closed captioning (CC)
•
EDTV
•
Gemstar 1×- and 2×-compatible data recovery
The user should start an read sequence with VS by first
examining the VBI Info register. Then, depending on what data
was detected, the appropriate data registers should be read.
ADDITIONAL
DELAY BY
1 LINE
FIELD
TOGGLE
Copy generation management systems (CGMS)
All VBI data registers are double-buffered with the field signals.
This means that data is extracted from the video lines and
appears in the appropriate I2C registers with the next field
transition. They are then static until the next field.
04984-029
1
•
The presence of any of the above signals is detected and, if
applicable, a parity check is performed. The result of this testing
is contained in a confidence bit in the VBI Info[7:0] register.
Users are encouraged to first examine the VBI Info register
before reading the corresponding data registers. All VBI data
decode bits are read only.
DELAY TOGGLE OF
FIELD BY PFTOG[4:0]
O
ADVANCE TOGGLE OF
FIELD BY PFTOG[4:0]
0
Wide screen signaling (WSS)
The data registers are filled with decoded VBI data even if their
corresponding detection bits are low; it is likely that bits within
the decoded data stream are wrong.
Figure 29. PAL F Toggle
Rev. B | Page 46 of 100
ADV7181B
The closed captioning data (CCAP) is available in the I2C
registers, and is also inserted into the output video data stream
during horizontal blanking.
CGMSD CGMS-A Sequence Detected, Address 0x90[3]
Logic 1 for this bit indicates the data in the CGMS1, 2, 3
registers is valid. The CGMSD bit goes high if a valid CRC
checksum has been calculated from a received CGMS packet.
The Gemstar-compatible data is not available in the I2C
registers, and is inserted into the data stream only during
horizontal blanking.
When CGMSD is 0, no CGMS transmission is detected and
confidence in decoded data is low.
WSSD Wide Screen Signaling Detected, Address 0x90[0]
When CGMSD is 1, the CGMS sequence is decoded and
confidence in decoded data is high.
Logic 1 for this bit indicates the data in the WSS1 and WSS2
registers is valid.
CRC_ENABLE CRC CGMS-A Sequence, Address 0xB2[2]
The WSSD bit goes high if the rising edge of the start bit is
detected within a time window, and if the polarity of the parity
bit matches the transmitted data.
TE
For certain video sources, the CRC data bits can have an invalid
format. In such circumstances, the CRC checksum validation
procedure can be disabled. The CGMSD bit goes high if the
rising edge of the start bit is detected within a time window.
When WSSD is 0, no WSS is detected and confidence in the
decoded data is low.
When CRC_ENABLE is 0, no CRC check is performed. The
CGMSD bit goes high if the rising edge of the start bit is
detected within a time window.
When WSSD is 1, WSS is detected and confidence in the
decoded data is high.
LE
CCAPD Closed Caption Detected, Address 0x90[1]
The CCAPD bit goes high if the rising edge of the start bit is
detected within a time window, and if the polarity of the parity
bit matches the transmitted data.
Wide Screen Signaling Data
WSS1[7:0], Address 0x91[7:0],
WSS2[7:0], Address 0x92[7:0]
B
SO
Logic 1 for this bit indicates the data in the CCAP1 and CCAP2
registers is valid.
When CRC_ENABLE is 1 (default), CRC checksum is used to
validate the CGMS sequence. The CGMSD bit goes high for a
valid checksum. ADI recommended setting.
Figure 30 shows the bit correspondence between the analog
video waveform and the WSS1/WSS2 registers. WSS2[7:6] are
undetermined and should be masked out by software.
When CCAPD is 0, no CCAP signals are detected and
confidence in the decoded data is low.
When CCAPD is 1, the CCAP sequence is detected and
confidence in the decoded data is high.
EDTV Data Registers
EDTV1[7:0], Address 0x93[7:0],
EDTV2[7:0], Address 0x94[7:0],
EDTV3[7:0], Address 0x95[7:0]
EDTVD EDTV Sequence Detected, Address 0x90[2]
Logic 1 for this bit indicates the data in the EDTV1, 2, 3
registers is valid.
Figure 31 shows the bit correspondence between the analog
video waveform and the EDTV1/EDTV2/EDTV3 registers.
The EDTVD bit goes high if the rising edge of the start bit is
detected within a time window, and if the polarity of the parity
bit matches the transmitted data.
O
EDTV3[7:6] are undetermined and should be masked out by
software. EDTV3[5] is reserved for future use and, for now,
contains a 0. The three LSBs of the EDTV waveform are
currently not supported.
When EDTVD is 0, no EDTV sequence is detected. Confidence
in decoded data is low.
When EDTVD is 1, an EDTV sequence is detected. Confidence
in decoded data is high.
WSS1[7:0]
0
RUN-IN
SEQUENCE
1
2
3
4
5
WSS2[5:0]
6
7
0
1
START
CODE
2
3
4
5
ACTIVE
VIDEO
11.0μs
04984-030
38.4μs
42.5μs
Figure 30. WSS Data Extraction
Rev. B | Page 47 of 100
ADV7181B
Table 57. WSS Access Information
Signal Name
WSS1[7:0]
WSS2[5:0]
Register Location
WSS 1[7:0]
WSS 2[5:0]
EDTV1[7:0]
0
1
Address
0x91
0x92
145d
146d
EDTV2[7:0]
Register Default Value
Readback only
Readback only
EDTV3[5:0]
2
NOT SUPPORTED
4
5
6
7
0
1
2 3 4
5
6 7
0
1 2
3
4
5
LE
04984-031
TE
3
Figure 31. EDTV Data Extraction
Table 58. EDTV Access Information
Register Location
EDTV 1[7:0]
EDTV 2[7:0]
EDTV 3[7:0]
147d
148d
149d
Address
0x93
0x94
0x95
Register Default Value
Readback only
Readback only
Readback only
B
SO
CGMS Data Registers
CGMS1[7:0], Address 0x96[7:0]
CGMS2[7:0], Address 0x97[7:0]
CGMS3[7:0], Address 0x98[7:0]
Closed Caption Data Registers
CCAP1[7:0], Address 0x99[7:0]
CCAP2[7:0], Address 0x9A[7:0]
Figure 33 shows the bit correspondence between the analog
video waveform and the CCAP1/CCAP2 registers.
O
Figure 32 shows the bit correspondence between the analog
video waveform and the CGMS1/CGMS2/CGMS3 registers.
CGMS3[7:4] are undetermined and should be masked out by
software.
CCAP1[7] contains the parity bit from the first word.
CCAP2[7] contains the parity bit from the second word.
Refer to the GDECAD Gemstar Decode Ancillary Data Format,
Address 0x4C[0] section.
+100 IRE
REF
+70 IRE
CGMS1[7:0]
0
1
2
3
4
5
CGMS2[7:0]
6
7
0
1
2
3
4
CGMS3[3:0]
5
6
7
0
1
2
3
0 IRE
49.1μs ± 0.5μs
–40 IRE
11.2μs
CRC SEQUENCE
2.235μs ± 20ns
Figure 32. CGMS Data Extraction
Rev. B | Page 48 of 100
04984-032
Signal Name
EDTV1[7:0]
EDTV2[7:0]
EDTV3[7:0]
ADV7181B
Table 59. CGMS Access Information
Register Location
CGMS 1[7:0]
CGMS 2[7:0]
CGMS 3[3:0]
150d
151d
152d
10.5 ± 0.25μs
Address
0x96
0x97
0x98
Register Default Value
Readback Only
Readback Only
Readback Only
12.91μs
7 CYCLES
OF 0.5035MHz
(CLOCK RUN-IN)
CCAP2[7:0]
CCAP1[7:0]
S
T
A
R
T
BYTE 0
40 IRE
P
A
R
I
T
Y
P
A
R
I
T
Y
TE
50 IRE
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
REFERENCE COLOR BURST
(9 CYCLES)
FREQUENCY = FSC = 3.579545MHz
AMPLITUDE = 40 IRE
10.003μs
33.764μs
LE
27.382μs
BYTE 1
04984-033
Signal Name
CGMS1[7:0]
CGMS2[7:0]
CGMS3[3:0]
Figure 33. Closed Caption Data Extraction
Table 60. CCAP Access Information
Signal Name
CCAP1[7:0]
CCAP2[7:0]
Register Location
CCAP 1[7:0]
CCAP 2[7:0]
B
SO
Letterbox Detection
153d
154d
Incoming video signals can conform to different aspect ratios
(16:9 wide screen of 4:3 standard). For certain transmissions in
the wide screen format, a digital sequence (WSS) is transmitted
with the video signal. If a WSS sequence is provided, the aspect
ratio of the video can be derived from the digitally decoded bits
WSS contains.
O
In the absence of a WSS sequence, letterbox detection can be
used to find wide screen signals. The detection algorithm
examines the active video content of lines at the start and end
of a field. If black lines are detected, it indicates the picture
currently displayed is in wide screen format.
The active video content (luminance magnitude) over a line of
video is summed together. At the end of a line, this accumulated
value is compared with a threshold, and a decision is made as to
whether or not a particular line is black. The threshold value
needed can depend on the type of input signal; some control is
provided via LB_TH[4:0].
Detection at the Start of a Field
The ADV7181B expects a section of at least six consecutive
black lines of video at the top of a field. Once those lines are
detected, Register LB_LCT[7:0] reports back the number of
black lines that were actually found. By default, the ADV7181B
starts looking for those black lines in sync with the beginning of
active video, for example, straight after the last VBI video line.
Address
0x99
0x9A
Register Default Value
Readback only
Readback only
LB_SL[3:0] allows the user to set the start of letterbox detection
from the beginning of a frame on a line-by-line basis. The
detection window closes in the middle of the field.
Detection at the End of a Field
The ADV7181B expects at least six continuous lines of black
video at the bottom of a field before reporting back the number
of lines actually found via the LB_LCB[7:0] value. The activity
window for letterbox detection (end of field) starts in the middle of an active field. Its end is programmable via LB_EL[3:0].
Detection at the Midrange
Some transmissions of wide screen video include subtitles
within the lower black box. If the ADV7181B finds at least two
black lines followed by some more nonblack video, for example,
the subtitle, and is then followed by the remainder of the
bottom black block, it reports back a midcount via LB_LCM[7:0].
If no subtitles are found, LB_LCM[7:0] reports the same number
as LB_LCB[7:0].
There is a two-field delay in the reporting of any line count
parameters.
There is no letterbox detected bit. The user is asked to read the
LB_LCT[7:0] and LB_LCB[7:0] register values and to conclude
whether or not the letterbox-type video is present in software.
Rev. B | Page 49 of 100
ADV7181B
LB_LCT[7:0] Letterbox Line Count Top,
Address 0x9B[7:0]; LB_LCM[7:0] Letterbox Line Count
Mid, Address 0x9C[7:0]; LB_LCB[7:0] Letterbox Line Count
Bottom, Address 0x9D[7:0]
Table 61. LB_LCx Access Information
Address
0x9B
0x9C
0x9D
Register Default Value
Readback only
Readback only
Readback only
The format of the data packet depends on the following criteria:
LB_TH[4:0] Letterbox Threshold Control,
Address 0xDC[4:0]
•
Transmission is 1× or 2×.
•
Data is output in 8-bit or 4-bit format (see the GDECAD
Gemstar Decode Ancillary Data Format,
Address 0x4C[0] section).
Table 62. LB_TH Function
Description
Default threshold for detection of black lines
Increase threshold (need larger active video
content before identifying non-black lines)
Decrease threshold (even small noise levels
can cause the detection of non-black lines)
•
Data is closed caption (CCAP) or Gemstar-compatible.
Data packets are output if the corresponding enable bit is set
(see the GDECEL[15:0] Gemstar Decoding Even Lines,
Address 0x48[7:0]; Address 0x49[7:0] and GDECOL[15:0]
Gemstar Decoding Odd Lines, Address 0x4A[7:0]; Address
0x4B[7:0] sections), and if the decoder detects the presence of
data. This means that for video lines where no data has been
decoded, no data packet is output even if the corresponding line
enable bit is set.
LE
LB_TH[4:0]
01100 (default)
01101 to
10000
00000 to
01011
TE
Signal Name
LB_LCT[7:0]
LB_LCM[7:0]
LB_LCB[7:0]
The recovered data is not available through I2C, but is inserted
into the horizontal blanking period of an ITU-R BT.656-compatible data stream. The data format is intended to comply with
the recommendation by the International Telecommunications
Union, ITU-R BT.1364. See Figure 34. For more information,
see the ITU website at www.itu.ch.
LB_SL[3:0] Letterbox Start Line, Address 0xDD[7:4]
The LB_SL[3:0] bits are set at 0100b by default. This means the
letterbox detection window starts after the EDTV VBI data line.
For an NTSC signal, this window is from Line 23 to Line 286.
B
SO
Changing the bits to 0101, the detection window starts on
Line 24 and ends on Line 287.
Each data packet starts immediately after the EAV code of the
preceding line. Figure 34 and Table 63 show the overall
structure of the data packet.
Entries within the packet are as follows:
LB_EL[3:0] Letterbox End Line, Address 0xDD[3:0]
•
Fixed preamble sequence of 0x00, 0xFF, 0xFF.
•
Data identification word (DID). The value for the DID
marking a Gemstar or CCAP data packet is 0x140
(10-bit value).
•
Secondary data identification word (SDID) contains
information about the video line from which data was
retrieved, whether the Gemstar transmission was of 1× or
2× format, and whether it was retrieved from an even or
odd field.
•
Data count byte, giving the number of user data-words that
follow.
The block is configured via I2C in the following ways:
•
User data section.
•
•
Optional padding to ensure the length of the user dataword section of a packet is a multiple of four bytes,
requirement as set in ITU-R BT.1364.
•
Checksum byte.
The LB_EL[3:0] bits are set at 1101b by default. This means that
letterbox detection window ends with the last active video line.
For an NTSC signal, this window is from Line 262 to Line 525.
Changing the bits to 1100, the detection window starts on
Line 261 and ends on Line 254.
Gemstar Data Recovery
O
The Gemstar-compatible data recovery block (GSCD) supports
1× and 2× data transmissions. In addition, it can also serve as a
closed caption decoder. Gemstar-compatible data transmissions
can only occur in NTSC. Closed caption data can be decoded in
both PAL and NTSC.
•
•
GDECEL[15:0] allows data recovery on selected video lines
on even fields to be enabled and disabled.
GDECOL[15:0] enables the data recovery on selected lines
for odd fields.
GDECAD configures the way in which data is embedded
in the video data stream.
Table 63 lists the values within a generic data packet that are
output by the ADV7181B in 8-bit format. In 8-bit systems,
Bits D1 and D0 in the data packets are disregarded.
Rev. B | Page 50 of 100
ADV7181B
00
FF
FF
DID
SECONDARY DATA IDENTIFICATION
SDID
DATA
COUNT
OPTIONAL PADDING
BYTES
USER DATA
PREAMBLE FOR ANCILLARY DATA
CHECK
SUM
04984-034
DATA IDENTIFICATION
USER DATA (4 OR 8 WORDS)
Figure 34. Gemstar and CCAP Embedded Data Packet (Generic)
Table 63. Generic Data Output Packet
D[8]
0
1
1
1
EP
EP
EP
EP
EP
EP
EP
EP
EP
EP
CS[8]
D[7]
0
1
1
0
EF
0
0
0
0
0
0
0
0
0
CS[7]
Table 64. Data Byte Allocation
Raw Information Bytes
Retrieved from the Video Line
4
4
2
2
D[5]
0
1
1
0
D[4]
0
1
1
0
D[3]
0
1
1
0
Line[3:0]
0
DC[1]
Word1[7:4]
Word1[3:0]
Word2[7:4]
Word2[3:0]
Word3[7:4]
Word3[3:0]
Word4[7:4]
Word4[3:0]
CS[4]
CS[3]
0
CS[5]
D[2]
0
1
1
0
DC[0]
GDECAD
0
1
0
1
CS[2]
User Data-Words
(Including Padding)
8
4
4
4
B
SO
2×
1
1
0
0
D[6]
0
1
1
1
2X
0
0
0
0
0
0
0
0
0
CS[6]
D[1]
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
D[0]
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count (DC)
User data-words
User data-words
User data-words
User data-words
User data-words
User data-words
User data-words
User data-words
Checksum
TE
D[9]
0
1
1
0
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!CS[8]
LE
Byte
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Padding Bytes
0
0
0
2
DC[1:0]
10
01
01
01
Gemstar Bit Names
DID. The data identification value is 0x140 (10-bit value).
Care has been taken so the two LSBs do not carry vital
information in 8-bit systems.
O
•
•
EP and !EP. The EP bit is set to ensure even parity on the
data-word D[8:0]. Even parity means there is always an
even number of 1s within the D[8:0] bit arrangement. This
includes the EP bit. !EP describes the logic inverse of EP
and is output on D[9]. The !EP is output to ensure the
reserved codes of 00 and FF cannot happen.
•
EF. Even field identifier. EF = 1 indicates the data was
recovered from a video line on an even field.
•
2×. This bit indicates whether the data sliced was in
Gemstar 1× or 2× format. A high indicates 2× format.
•
line[3:0]. This entry provides a code that is unique for each
of the possible 16 source lines of video from which
Gemstar data can be retrieved. See Table 73 and Table 74.
•
DC[1:0]. Data count value. The number of user data-words
(UDW) in the packet divided by 4. The number of UDWs
in any packet must be an integral number of 4. Padding is
required at the end, if necessary (requirement as set in
ITU-R BT.1364). See Table 64.
•
The 2× bit determines whether the raw information
retrieved from the video line was 2 or 4 bytes. The state of
the GDECAD bit affects whether the bytes are transmitted
straight (that is, two bytes transmitted as two bytes) or
whether they are split into nibbles (that is, two bytes
transmitted as four half bytes). Padding bytes are then
added where necessary.
Rev. B | Page 51 of 100
ADV7181B
•
CS[8:2]. The checksum is provided to determine the
integrity of the ancillary data packet. It is calculated by
summing up D[8:2] of DID, SDID, the data count byte, and
all UDWs, and ignoring any overflow during the
summation. Since all data bytes that are used to calculate
the checksum have their two LSBs set to 0, the CS[1:0] bits
are also always 0.
Gemstar 2× Format, Half-Byte Output Mode
Half-byte output mode is selected by setting CDECAD = 0;
full-byte output mode is selected by setting CDECAD = 1.
See the GDECAD Gemstar Decode Ancillary Data Format,
Address 0x4C[0] section.
Gemstar 1× Format
Half-byte output mode is selected by setting CDECAD = 0;
full-byte output mode is selected by setting CDECAD = 1.
See the GDECAD Gemstar Decode Ancillary Data Format,
Address 0x4C[0] section.
!CS[8] describes the logic inversion of CS[8]. The value
!CS[8] is included in the checksum entry of the data
packet to ensure the reserved values of 0x00 and 0xFF do
not occur.
TE
Table 65 to Table 68 outline the possible data packages.
Table 65. Gemstar 2× Data, Half-Byte Mode
D[8]
0
1
1
1
EP
EP
EP
EP
EP
EP
EP
EP
EP
EP
CS[8]
D[7]
0
1
1
0
EF
0
0
0
0
0
0
0
0
0
CS[7]
D[6]
0
1
1
1
1
0
0
0
0
0
0
0
0
0
CS[6]
D[5]
0
1
1
0
0
D[4]
0
1
1
0
D[3]
0
1
1
0
Line[3:0]
0
1
Gemstar Word1[7:4]
Gemstar Word1[3:0]
Gemstar Word2[7:4]
Gemstar Word2[3:0]
Gemstar Word3[7:4]
Gemstar Word3[3:0]
Gemstar Word4[7:4]
Gemstar Word4[3:0]
CS[4]
CS[3]
D[2]
0
1
1
0
D[1]
0
1
1
0
0
0
0
0
0
0
0
0
0
0
CS[1]
LE
D[9]
0
1
1
0
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!CS[8]
B
SO
Byte
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CS[5]
0
CS[2]
D[0]
0
1
1
0
0
0
0
0
0
0
0
0
0
0
CS[0]
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count
User data-words
User data-words
User data-words
User data-words
User data-words
User data-words
User data-words
User data-words
Checksum
Table 66. Gemstar 2× Data, Full-Byte Mode
D[9]
0
1
1
0
!EP
!EP
D[8]
0
1
1
1
EP
EP
D[7]
0
1
1
0
EF
0
CS[8]
CS[7]
O
Byte
0
1
2
3
4
5
6
7
8
9
10
!CS[8]
D[6]
D[5]
0
0
1
1
1
1
1
0
1
0
0
Gemstar Word1[7:0]
Gemstar Word2[7:0]
Gemstar Word3[7:0]
Gemstar Word4[7:0]
CS[6]
CS[5]
D[4]
D[3]
0
0
1
1
1
1
0
0
Line[3:0]
0
0
D[2]
0
1
1
0
CS[4]
CS[2]
CS[3]
Rev. B | Page 52 of 100
1
D[1]
0
1
1
0
0
0
0
0
0
0
CS[1]
D[0]
0
1
1
0
0
0
0
0
0
0
CS[0]
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count
User data-words
User data-words
User data-words
User data-words
Checksum
ADV7181B
Table 67. Gemstar 1× Data, Half-Byte Mode
D[9]
0
1
1
0
!EP
!EP
!EP
!EP
!EP
!EP
!CS[8]
D[8]
0
1
1
1
EP
EP
EP
EP
EP
EP
CS[8]
D[7]
0
1
1
0
EF
0
0
0
0
0
CS[7]
D[6]
0
1
1
1
0
0
0
0
0
0
CS[6]
D[5]
0
1
1
0
0
CS[5]
D[4]
0
1
1
0
D[3]
0
1
1
0
Line[3:0]
0
0
Gemstar Word1[7:4]
Gemstar Word1[3:0]
Gemstar Word2[7:4]
Gemstar Word2[3:0]
CS[4]
CS[3]
Table 68. Gemstar 1× Data, Full-Byte Mode
D[8]
0
1
1
1
EP
EP
D[7]
0
1
1
0
EF
0
1
1
!CS[8]
0
0
CS[8]
0
0
CS[7]
D[6]
D[5]
0
0
1
1
1
1
1
0
0
0
0
Gemstar Word1[7:0]
Gemstar Word2[7:0]
0
0
0
0
CS[6]
CS[5]
D[4]
0
1
1
0
1
CS[2]
D[1]
0
1
1
0
0
0
0
0
0
0
CS[1]
D[3]
0
1
1
0
Line[3:0]
0
D[2]
0
1
1
0
0
0
0
CS[4]
D[0]
0
1
1
0
0
0
0
0
0
0
CS[0]
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count
User data-words
User data-words
User data-words
User data-words
Checksum
D[1]
0
1
1
0
0
0
0
0
0
0
CS[1]
D[0]
0
1
1
0
0
0
0
0
0
0
CS[0]
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count
User data-words
User data-words
UDW padding 0x200
UDW padding 0x200
Checksum
D[1]
0
1
1
0
0
0
0
0
0
0
CS[1]
D[0]
0
1
1
0
0
0
0
0
0
0
CS[0]
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count
User data-words
User data-words
User data-words
User data-words
Checksum
LE
D[9]
0
1
1
0
!EP
!EP
B
SO
Byte
0
1
2
3
4
5
6
7
8
9
10
D[2]
0
1
1
0
TE
Byte
0
1
2
3
4
5
6
7
8
9
10
0
0
CS[3]
1
0
0
CS[2]
Table 69. NTSC CCAP Data, Half-Byte Mode
D[9]
0
1
1
0
!EP
!EP
!EP
!EP
!EP
!EP
!CS[8]
D[8]
0
1
1
1
EP
EP
EP
EP
EP
EP
CS[8]
D[7]
0
1
1
0
EF
0
0
0
0
0
CS[7]
O
Byte
0
1
2
3
4
5
6
7
8
9
10
D[6]
0
1
1
1
0
0
0
0
0
0
CS[6]
D[5]
0
1
1
0
1
0
CS[5]
D[4]
D[3]
0
0
1
1
1
1
0
0
0
1
0
0
CCAP Word1[7:4]
CCAP Word1[3:0]
CCAP Word2[7:4]
CCAP Word2[3:0]
CS[4]
CS[3]
Rev. B | Page 53 of 100
D[2]
0
1
1
0
1
1
CS[2]
ADV7181B
NTSC CCAP Data
PAL CCAP Data
Half-byte output mode is selected by setting CDECAD = 0; the
full-byte mode is enabled by CDECAD = 1. See the GDECAD
Gemstar Decode Ancillary Data Format,
Address 0x4C[0] section. The data packet formats are shown in
Table 69 and Table 70.
Half-byte output mode is selected by setting CDECAD = 0;
full-byte output mode is selected by setting CDECAD = 1.
See the GDECAD Gemstar Decode Ancillary Data Format,
Address 0x4C[0] section. Table 71 and Table 72 list the bytes
of the data packet.
NTSC closed caption data is sliced on Line 21d on even and
odd fields. The corresponding enable bit has to be set high.
See the GDECEL[15:0] Gemstar Decoding Even Lines,
Address 0x48[7:0]; Address 0x49[7:0] and the GDECOL[15:0]
Gemstar Decoding Odd Lines, Address 0x4A[7:0]; Address
0x4B[7:0] sections.
PAL closed caption data is sliced from Lines 22 and 335. The
corresponding enable bits have to be set.
Table 70. NTSC CCAP Data, Full-Byte Mode
1
1
!CS[8]
D[8]
0
1
1
1
EP
EP
D[7]
0
1
1
0
EF
0
D[6]
D[5]
0
0
1
1
1
1
1
0
0
1
0
0
CCAP Word1[7:0]
CCAP Word2[7:0]
0
0
0
0
CS[6]
CS[5]
D[4]
0
1
1
0
0
0
D[3]
0
1
1
0
1
0
0
0
CS[8]
0
0
CS[7]
D[2]
0
1
1
0
1
1
D[1]
0
1
1
0
0
0
0
0
0
0
CS[1]
LE
D[9]
0
1
1
0
!EP
!EP
B
SO
Byte
0
1
2
3
4
5
6
7
8
9
10
TE
See the GDECEL[15:0] Gemstar Decoding Even Lines,
Address 0x48[7:0]; Address 0x49[7:0] and the GDECOL[15:0]
Gemstar Decoding Odd Lines, Address 0x4A[7:0]; Address
0x4B[7:0] sections.
0
0
CS[4]
0
0
CS[3]
0
0
CS[2]
D[0]
0
1
1
0
0
0
0
0
0
0
CS[0]
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count
User data-words
User data-words
UDW padding 0x200
UDW padding 0x200
Checksum
Table 71. PAL CCAP Data, Half-Byte Mode
D[9]
0
1
1
0
!EP
!EP
!EP
!EP
!EP
!EP
!CS[8]
D[8]
0
1
1
1
EP
EP
EP
EP
EP
EP
CS[8]
D[7]
0
1
1
0
EF
0
0
0
0
0
CS[7]
O
Byte
0
1
2
3
4
5
6
7
8
9
10
D[6]
0
1
1
1
0
0
0
0
0
0
CS[6]
D[5]
0
1
1
0
1
0
CS[5]
D[4]
D[3]
0
0
1
1
1
1
0
0
0
1
0
0
CCAP Word1[7:4]
CCAP Word1[3:0]
CCAP Word2[7:4]
CCAP Word2[3:0]
CS[4]
CS[3]
Rev. B | Page 54 of 100
D[2]
0
1
1
0
0
1
CS[2]
D[1]
0
1
1
0
0
0
0
0
0
0
CS[1]
D[0]
0
1
1
0
0
0
0
0
0
0
CS[0]
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count
User data-words
User data-words
User data-words
User data-words
Checksum
ADV7181B
Table 72. PAL CCAP Data, Full-Byte Mode
D[9]
0
1
1
0
!EP
!EP
D[8]
0
1
1
1
EP
EP
D[7]
0
1
1
0
EF
0
1
1
!CS[8]
0
0
CS[8]
0
0
CS[7]
D[6]
D[5]
0
0
1
1
1
1
1
0
0
1
0
0
CCAP Word1[7:0]
CCAP Word2[7:0]
0
0
0
0
CS[6]
CS[5]
D[4]
0
1
1
0
0
0
D[3]
0
1
1
0
1
0
D[2]
0
1
1
0
0
1
0
0
CS[4]
0
0
CS[3]
0
0
CS[2]
GDECEL[15:0] Gemstar Decoding Even Lines,
Address 0x48[7:0]; Address 0x49[7:0]
D[1]
0
1
1
0
0
0
0
0
0
0
CS[1]
D[0]
0
1
1
0
0
0
0
0
0
0
CS[0]
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count
User data-words
User data-words
UDW padding 0x200
UDW padding 0x200
Checksum
TE
Byte
0
1
2
3
4
5
6
7
8
9
10
GDECAD Gemstar Decode Ancillary Data Format,
Address 0x4C[0]
The decoded data from Gemstar-compatible transmissions
or closed caption transmissions is inserted into the horizontal
blanking period of the respective line of video. A potential
problem can arise if the retrieved data bytes have the value 0x00
or 0xFF. In an ITU-R BT.656-compatible data stream, those
values are reserved and used only to form a fixed preamble.
LE
The 16 bits of the GDECEL[15:0] are interpreted as a collection
of 16 individual line decode enable signals. Each bit refers to a
line of video in an even field. Setting the bit enables the decoder
block trying to find Gemstar or closed caption-compatible data
on that particular line. Setting the bit to 0 prevents the decoder
from trying to retrieve data. See Table 73 and Table 74.
B
SO
To retrieve closed caption data services on NTSC (Line 284),
GDECEL[11] must be set.
The GDECAD bit allows the data to be inserted into the
horizontal blanking period in two ways
•
The default value of GDECEL[15:0] is 0x0000. This setting
instructs the decoder not to attempt to decode Gemstar or
CCAP data from any line in the even field.
Insert all data straight into the data stream, even the reserved
values of 0x00 and 0xFF, if they occur. This can violate the
output data format specification ITU-R BT.1364.
•
Split all data into nibbles and insert the half-bytes over
double the number of cycles in a 4-bit format.
GDECOL[15:0] Gemstar Decoding Odd Lines, Address
0x4A[7:0]; Address 0x4B[7:0]
When GDECAD is 0, the data is split into half-bytes and
inserted (default).
The 16 bits of the GDECOL[15:0] form a collection of 16
individual line decode enable signals. See Table 73 and Table 74.
When GDECAD is 1, the data is output straight in 8-bit format.
O
To retrieve closed caption data services on PAL (Line 335),
GDECEL[14] must be set.
To retrieve closed caption data services on NTSC (Line 21),
GDECOL[11] must be set.
To retrieve closed caption data services on PAL (Line 22),
GDECOL[14] must be set.
The default value of GDEC0L[15:0] is 0x0000. This setting
instructs the decoder not to attempt to decode Gemstar or
CCAP data from any line in the odd field.
Rev. B | Page 55 of 100
ADV7181B
Enable Bit
GDECOL[0]
GDECOL[1]
GDECOL[2]
GDECOL[3]
GDECOL[4]
GDECOL[5]
GDECOL[6]
GDECOL[7]
GDECOL[8]
GDECOL[9]
GDECOL[10]
GDECOL[11]
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
22
23
24
25
273 (10)
274 (11)
275 (12)
276 (13)
277 (14)
278 (15)
279 (16)
280 (17)
281 (18)
282 (19)
283 (20)
284 (21)
GDECOL[12]
GDECOL[13]
GDECOL[14]
GDECOL[15]
GDECEL[0]
GDECEL[1]
GDECEL[2]
GDECEL[3]
GDECEL[4]
GDECEL[5]
GDECEL[6]
GDECEL[7]
GDECEL[8]
GDECEL[9]
GDECEL[10]
GDECEL[11]
12
13
14
15
285 (22)
286 (23)
287 (24)
288 (25)
GDECEL[12]
GDECEL[13]
GDECEL[14]
GDECEL[15]
Comment
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar or
closed caption
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar or
closed caption
Gemstar
Gemstar
Gemstar
Gemstar
Line[3:0]
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
Line Number
(ITU-R BT.470)
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
321 (8)
322 (9)
323 (10)
324 (11)
325 (12)
326 (13)
327 (14)
328 (15)
329 (16)
330 (17)
331 (18)
332 (19)
333 (20)
334 (21)
335 (22)
336 (23)
LE
Line Number
(ITU-R BT.470)
10
11
12
13
14
15
16
17
18
19
20
21
O
B
SO
Line[3:0]
0
1
2
3
4
5
6
7
8
9
10
11
Table 74. PAL Line Enable Bits and Corresponding Line
Numbering
Enable Bit
GDECOL[0]
GDECOL[1]
GDECOL[2]
GDECOL[3]
GDECOL[4]
GDECOL[5]
GDECOL[6]
GDECOL[7]
GDECOL[8]
GDECOL[9]
GDECOL[10]
GDECOL[11]
GDECOL[12]
GDECOL[13]
GDECOL[14]
GDECOL[15]
GDECEL[0]
GDECEL[1]
GDECEL[2]
GDECEL[3]
GDECEL[4]
GDECEL[5]
GDECEL[6]
GDECEL[7]
GDECEL[8]
GDECEL[9]
GDECEL[10]
GDECEL[11]
GDECEL[12]
GDECEL[13]
GDECEL[14]
GDECEL[15]
Comment
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Closed caption
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Not valid
Closed caption
Not valid
TE
Table 73. NTSC Line Enable Bits and Corresponding Line
Numbering
Rev. B | Page 56 of 100
ADV7181B
I2C Interrupt System
IF Compensation Filter
IF FILTSEL[2:0] IF Filter Select Address 0xF8[2:0]
The IF FILTSEL[2:0] register allows the user to compensate
for SAW filter characteristics on a composite input as would
be observed on tuner outputs. Figure 35 and Figure 36 show
IF filter compensation for NTSC and PAL.
The ADV7181B has a comprehensive interrupt register set. This
map is located in Register Access Page 2. See Table 83 or details
of the interrupt register map.
Steps to access this map are presented in Figure 37.
Bypass mode (default)
•
NTSC—consists of three filter characteristics
•
PAL—consists of three filter characteristics
See Table 85 for programming details.
6
B
SO
–8
2.5
3.0
3.5
4.0
4.5
5.0
FREQUENCY (MHz)
Figure 35. NTSC IF Compensation Filter Responses
Table 75. INTRQ_DUR_SEL
INTRQ_DURSEL[1:0]
00
01
10
11
Description
3 Xtal periods (default)
15 Xtal periods
63 Xtal periods
Active until cleared
When the active until cleared interrupt duration is selected and
the event that caused the interrupt is no longer in force, the
interrupt persists until it is masked or cleared.
–4
For example, if the ADV7181B loses lock, an interrupt is
generated and the INTRQ pin goes low. If the ADV7181B
returns to the locked state, INTRQ continues to drive low
until the SD_LOCK bit is either masked or cleared.
–6
Interrupt Drive Level
0
O
AMPLITUDE (dB)
INTERRUPT REGISTER SPACE
INTRQ_DURSEL[1:0], Interrupt Duration Select
Address 0x40 (Interrupt Space)[7:6]
–6
2
NORMAL REGISTER SPACE
LE
–4
04984-035
AMPLITUDE (dB)
–2
4
I2C SPACE
REGISTER ACCESS PAGE 2
ADDRESS 0x40 ≥ 0x4C
When an interrupt event occurs, the interrupt pin INTRQ
goes low with a programmable duration given by
INTRQ_DUR_SEL[1:0]
0
6
I2C SPACE
REGISTER ACCESS PAGE 1
ADDRESS 0x40 ≥ 0xFF
Interrupt Request Output Operation
2
–12
2.0
ADDRESS 0x0E BIT 6, 5 = 01b
Figure 37. Register Access, Page 1 and Page 2
4
–10
ADDRESS 0x0E BIT 6, 5 = 00b
TE
•
3.5
4.0
4.5
5.0
5.5
FREQUENCY (MHz)
Figure 36. PAL IF Compensation Filter Responses
6.0
04984-036
–2
–8
3.0
04984-037
COMMON I2C SPACE
ADDRESS 0x00 ≥ 0x3F
The options for this feature are as follows:
The ADV7181B resets with open drain enabled and all interrupts
masked off. Therefore, INTRQ is in a high impedance state after
reset. 01 or 10 must to be written to INTRQ_OP_SEL[1:0] for a
logic level to be driven out from the INTRQ pin.
It is also possible to write to a register in the ADV7181B that
manually asserts the INTRQ pin. This bit is MPU_STIM_INTRQ.
Rev. B | Page 57 of 100
ADV7181B
Macrovision Interrupt Selection Bits
INTRQ_OP_SEL[1:0], Interrupt Duration Select
Address 0x40 (Interrupt Space)[1:0]
The user can select between pseudo sync pulse and color stripe
detection as follows:
Table 76. INTRQ_OP_SEL
Description
Open drain (default)
Drive low when active
Drive high when active
Reserved
MV_INTRQ_SEL[1:0], Macrovision Interrupt Selection
Bits, Address 0x40 (Interrupt Space)[5:4]
Table 77. MV_INTRQ_SEL
Multiple Interrupt Events
Description
Reserved
Pseudo sync only (default)
Color stripe only
Either pseudo sync or color stripe
Additional information relating to the interrupt system is
detailed in Table 83.
O
B
SO
LE
If Interrupt Event 1 occurs and then Interrupt Event 2 occurs
before the system controller has cleared or masked Interrupt
Event 1, the ADV7181B does not generate a second interrupt
signal. The system controller should check all unmasked
interrupt status bits since more than one can be active.
MV_INTRQ_SEL[1:0]
00
01
10
11
TE
INTRQ_OP_SEL[1:0]
00
01
10
11
Rev. B | Page 58 of 100
ADV7181B
PIXEL PORT CONFIGURATION
The ordering of components, for example, Cr vs. Cb or
CHA/B/C, can be changed. Refer to the SWPC Swap Pixel
Cr/Cb, Address 0x27[7] section. Table 78 shows the default
positions for the Cr/Cb components.
OF_SEL[3:0] Output Format Selection, Address 0x03[5:2]
The modes in which the ADV7181B pixel port can be configured
are under the control of OF_SEL[3:0]. See Table 79 for details.
SWPC Swap Pixel Cr/Cb, Address 0x27[7]
This bit allows Cr and Cb samples to be swapped.
The following I2C write allows the user to select between the
LLC1 (nominally at 27 MHz) and LLC2 (nominally at
13.5 MHz).
The LLC2 signal is useful for LLC2-compatible wide bus
(16-bit) output modes. See the OF_SEL[3:0] Output Format
Selection, Address 0x03[5:2] section for additional information.
The LLC2 signal and data on the data bus are synchronized. By
default, the rising edge of LLC1/LLC2 is aligned with the Y
data; the falling edge occurs when the data bus holds C data.
The polarity of the clock, and therefore the Y/C assignments to
the clock edges, can be altered by using the polarity LLC pin.
When LLC_PAD_SEL is 000, the output is nominally 27 MHz
LLC on the LLC1 pin (default).
When LLC_PAD_SEL is 101, the output is nominally 13.5 MHz
LLC on the LLC1 pin.
LE
The default LLC frequency output on the LLC1 pin is approximately 27 MHz. For modes that operate with a nominal data
rate of 13.5 MHz (0001, 0010), the clock frequency on the LLC1
pin stays at the higher rate of 27 MHz. For information on
outputting the nominal 13.5 MHz clock on the LLC1 pin,
see the LLC1 Output Selection, LLC_PAD_SEL[2:0],
Address 0x8F[6:4] section.
LLC1 Output Selection, LLC_PAD_SEL[2:0],
Address 0x8F[6:4]
TE
The ADV7181B has a very flexible pixel port that can be configured in a variety of formats to accommodate downstream ICs.
Table 78 and Table 79 summarize the various functions that the
ADV7181B pins can have in different modes of operation.
B
SO
When SWPC is 0 (default), no swapping is allowed.
When SWPC is 1, the Cr and Cb values can be swapped.
Table 78. P15–P0 Output/Input Pin Mapping
Format and Mode
Video Out, 8-Bit, 4:2:2
Video Out, 16-Bit, 4:2:2
15
14
13
12
11
YCrCb[7:0] OUT
Y[7:0] OUT
Data Port Pins P[15:0]
10
9
8
7
6
5
4
3
CrCb[7:0] OUT
O
Table 79. Standard Definition Pixel Port Modes
OF_SEL[3:0]
0010
0011
0110-1111
Format
16-bit @ LLC2 4:2:2
8-bit @ LLC1 4:2:2 (default)
Reserved
Rev. B | Page 59 of 100
P[15:8]
Y[7:0]
YCrCb[7:0]
P[15: 0]
P[7: 0]
CrCb[7:0]
Three-state
Reserved
2
1
0
ADV7181B
MPU PORT DESCRIPTION
The ADV7181B supports a 2-wire (I2C-compatible) serial interface. Two inputs, serial data (SDA) and serial clock (SCLK),
carry information between the ADV7181B and the system I2C
master controller. Each slave device is recognized by a unique
address. The ADV7181B’s I2C port allows the user to set up and
configure the decoder and to read back captured VBI data. The
ADV7181B has four possible slave addresses for both read and
write operations, depending on the logic level on the ALSB pin.
These four unique addresses are shown in Table 80. The
ADV7181B’s ALSB pin controls Bit 1 of the slave address. By
altering the ALSB, it is possible to control two ADV7181Bs in
an application without having a conflict with the same slave
address. The LSB (Bit 0) sets either a read or write operation.
Logic 1 corresponds to a read operation; Logic 0 corresponds to
a write operation.
Logic 0 on the LSB of the first byte means that the master writes
information to the peripheral. Logic 1 on the LSB of the first
byte means that the master reads information from the
peripheral.
Table 80. I2C Address for ADV7181B
Stop and start conditions can be detected at any stage during the
data transfer. If these conditions are asserted out of sequence with
normal read and write operations, they cause an immediate
jump to the idle condition. During a given SCLK high period,
the user should only issue one start condition, one stop condition,
or a single stop condition followed by a single start condition. If
an invalid subaddress is issued by the user, the ADV7181B does
not issue an acknowledge and returns to the idle condition.
Slave Address
0x40
0x41
0x42
0x43
TE
R/W
0
1
0
1
LE
ALSB
0
0
1
1
The ADV7181B acts as a standard slave device on the bus.
The data on the SDA pin is eight bits long, supporting the 7-bit
addresses plus the R/W bit. The ADV7181B has 249 subaddresses to enable access to the internal registers. It therefore
interprets the first byte as the device address and the second
byte as the starting subaddress. The subaddresses autoincrement, allowing data to be written to or read from the
starting subaddress. A data transfer is always terminated by a
stop condition. The user can also access any unique subaddress
register on a one-by-one basis without updating all the registers.
To control the device on the bus, a specific protocol must be
followed. First, the master initiates a data transfer by establishing a start condition, which is defined by a high-to-low
transition on SDA while SCLK remains high. This indicates that
an address/data stream follows. All peripherals respond to the
start condition and shift the next eight bits (7-bit address +
R/W bit). The bits are transferred from MSB down to LSB. The
peripheral that recognizes the transmitted address responds by
pulling the data line low during the ninth clock pulse; this is
known as an acknowledge bit. All other devices withdraw from
the bus at this point and maintain an idle condition. The idle
condition is where the device monitors the SDA and SCLK
lines, waiting for the start condition and the correct transmitted
address. The R/W bit determines the direction of the data.
B
SO
If in auto-increment mode the user exceeds the highest
subaddress, the following occurs:
In read mode, the highest subaddress register contents
continue to be output until the master device issues a no
acknowledge. This indicates the end of a read. A no
acknowledge condition is when the SDA line is not pulled
low on the ninth pulse.
•
In write mode, the data for the invalid byte is not loaded
into any subaddress register, a no acknowledge is issued by
the ADV7181B, and the part returns to the idle condition.
O
•
SCLOCK
S
1–7
8
9
1–7
8
9
1–7
START ADDR R/W ACK SUBADDRESS ACK
DATA
8
9
P
ACK
STOP
04984-038
SDATA
Figure 38. Bus Data Transfer
S SLAVE ADDR A(S)
SUB ADDR
A(S)
DATA
LSB = 0
READ
SEQUENCE
S SLAVE ADDR A(S)
S = START BIT
P = STOP BIT
A(S)
DATA
A(S) P
LSB = 1
SUB ADDR
A(S) S
SLAVE ADDR A(S)
A(S) = ACKNOWLEDGE BY SLAVE
A(M) = ACKNOWLEDGE BY MASTER
DATA
A(M)
A(S) = NO-ACKNOWLEDGE BY SLAVE
A(M) = NO-ACKNOWLEDGE BY MASTER
Figure 39. Read and Write Sequence
Rev. B | Page 60 of 100
DATA
A(M) P
04984-039
WRITE
SEQUENCE
ADV7181B
REGISTER ACCESSES
I2C SEQUENCER
The MPU can write to or read from all of the ADV7181B’s
registers, except the subaddress register, which is write only.
The subaddress register determines which register the next read
or write operation accesses. All communications with the part
through the bus start with an access to the subaddress register.
Then, a read/write operation is performed from/to the target
address, which then increments to the next address until a stop
command on the bus is performed.
An I2C sequencer is used when a parameter exceeds eight bits
and is, therefore, distributed over two or more I2C registers, for
example, HSB[11:0].
Register Select (SR to SR0)
To avoid this problem, the I2C sequencer holds the already
updated bits of the parameter in local memory; all bits of the
parameter are updated together once the last register write
operation has completed.
The correct operation of the I2C sequencer relies on the
following:
•
All I2C registers for the parameter in question must be
written to in order of ascending addresses. For example, for
HSB[10:0], write to Address 0x34 first, followed by 0x35.
•
No other I2C taking place between the two (or more) I2C
writes for the sequence. For example, for HSB[10:0], write
to Address 0x34 first, immediately followed by 0x35.
LE
The following sections describe the configuration of each
register. The communications register is an 8-bit, write only
register. After the part has been accessed over the bus and a
read/write operation is selected, the subaddress is set up. The
subaddress register determines to/from which register the
operation takes place. Table 82 lists the various operations
under the control of the subaddress register for the control port.
TE
REGISTER PROGRAMMING
When a parameter is changed using two or more I2C write
operations, the parameter can hold an invalid value for the time
between the first I2C completion and the last I2C completion.
This means that the top bits of the parameter can already hold
the new value while the remaining bits of the parameter still
hold the previous value.
O
B
SO
These bits are set up to point to the required starting address.
Rev. B | Page 61 of 100
ADV7181B
I2C REGISTER MAPS
Table 81. Common and Normal (Page 1) Register Map Details
O
Dec
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26 to 28
29
30 to 38
39
40 to 42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59 to 60
61
Subaddress
Hex
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A to 0x1C
0x1D
0x1E to 0x26
0x27
0x28 to 0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
0x32
0x33
0x34
0x35
0x36
0x37
0x38
0x39
0x3A
0x3B to 0x3C
0x3D
TE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
LE
Reset Value
0000 0000
1100 1000
0000 0100
0000 1100
01xx 0101
0000 0000
0000 0010
0111 1111
1000 0000
1000 0000
0000 0000
0000 0000
0011 0110
0111 1100
0000 0000
0000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
0001 0010
0100 xxxx
xxxx xxxx
0000 0001
1001 0011
1111 0001
xxxx xxxx
0000 0xxx
xxxx xxxx
0101 1000
xxxx xxxx
1110 0001
1010 1110
1111 0100
0000 0000
1111 xxxx
xxxx xxxx
0001 0010
0100 0001
1000 0100
0000 0000
0000 0010
0000 0000
0000 0001
1000 0000
1100 0000
0001 0000
xxxx xxxx
0100 0011
B
SO
Register Name
Input Control
Video Selection
Reserved
Output Control
Extended Output Control
Reserved
Reserved
Autodetect Enable
Contrast
Reserved
Brightness
Hue
Default Value Y
Default Value C
ADI Control
Power Management
Status 1
Ident
Status 2
Status 3
Analog Clamp Control
Digital Clamp Control 1
Reserved
Shaping Filter Control
Shaping Filter Control 2
Comb Filter Control
Reserved
ADI Control 2
Reserved
Pixel Delay Control
Reserved
Misc Gain Control
AGC Mode Control
Chroma Gain Control 1
Chroma Gain Control 2
Luma Gain Control 1
Luma Gain Control 2
Vsync Field Control 1
Vsync Field Control 2
Vsync Field Control 3
Hsync Position Control 1
Hsync Position Control 2
Hsync Position Control 3
Polarity
NTSC Comb Control
PAL Comb Control
ADC Control
Reserved
Manual Window Control
Rev. B | Page 62 of 100
ADV7181B
O
Dec
62 to 64
65
66 to 71
72
73
74
75
76
77
78
79
80
81
82 to142
143
144
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158 to 177
178
179 to 194
195
196
197 to 219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235 to 243
Subaddress
Hex
0x3E to 0x40
0x41
0x42 to 0x47
0x48
0x49
0x4A
0x4B
0x4C
0x4D
0x4E
0x4F
0x50
0x51
0x52 to 0x8E
0x8F
0x90
0x90
0x91
0x92
0x93
0x94
0x95
0x96
0x97
0x98
0x99
0x9A
0x9B
0x9C
0x9D
0x9E to 0xB1
0xB2
0xB2 to 0xC2
0xC3
0xC4
0xC5 to 0xDB
0xDC
0xDD
0xDE
0xDF
0xE0
0xE1
0xE2
0xE3
0xE4
0xE5
0xE6
0xE7
0xE8
0xE9
0xEA
0xEB to 0xF3
TE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
w
w
r
r
r
r
r
r
r
r
r
r
r
r
r
r
rw
w
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
LE
Reset Value
xxxx xxxx
0100 0001
xxxx xxxx
00000000
0000 0000
0000 0000
0000 0000
xxxx xxx0
1110 1111
0000 1000
xxxx xxxx
0000 1000
0010 0100
xxxx xxxx
0000 0000
0000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
0001 1100
xxxx xxxx
xxxx xxxx
0xxx xxxx
xxxx xxxx
1010 1100
0100 1100
0000 0000
0000 0000
0001 0100
1000 0000
1000 0000
1000 0000
1000 0000
0010 0101
0000 0100
0110 0011
0110 0101
0001 0100
0110 0011
xxxx xxxx
B
SO
Register Name
Reserved
Resample Control
Reserved
Gemstar Ctrl 1
Gemstar Ctrl 2
Gemstar Ctrl 3
Gemstar Ctrl 4
GemStar Ctrl 5
CTI DNR Ctrl 1
CTI DNR Ctrl 2
Reserved
CTI DNR Ctrl 4
Lock Count
Reserved
Free-Run Line Length 1
Reserved
VBI Info
WSS 1
WSS 2
EDTV 1
EDTV 2
EDTV 3
CGMS 1
CGMS 2
CGMS 3
CCAP 1
CCAP 2
Letterbox 1
Letterbox 2
Letterbox 3
Reserved
CRC Enable
Reserved
ADC Switch 1
ADC Switch 2
Reserved
Letterbox Control 1
Letterbox Control 2
Reserved
Reserved
Reserved
SD Offset Cb
SD Offset Cr
SD Saturation Cb
SD Saturation Cr
NTSC V Bit Begin
NTSC V Bit End
NTSC F Bit Toggle
PAL V Bit Begin
PAL V Bit End
PAL F Bit Toggle
Reserved
Rev. B | Page 63 of 100
ADV7181B
Register Name
Drive Strength
Reserved
IF Comp Control
VS Mode Control
Reset Value
xx01 0101
xxxx xxxx
0000 0000
0000 0000
rw
rw
rw
rw
rw
Dec
244
245-247
248
249
Subaddress
Hex
0xF4
0xF5-0xF7
0xF8
0xF9
Table 82. Common and Normal (Page 1) Register Map Bit Names
Bit 5
VID_SEL.1
BETACAM
Bit 4
VID_SEL.0
Bit 3
INSEL.3
ENVSPROC
VBI_EN
TOD
OF_SEL.3
OF_SEL.2
OF_SEL.1
OF_SEL.0
TIM_OE
BL_C_VBI
EN_SFL_PI
RANGE
AD_PALN_EN
AD_PALM_EN
AD_NTSC_EN
AD_PAL_EN
BT656-4
AD_SECAM_EN
AD_N443_EN
CON.7
CON.6
CON.5
BRI.7
HUE.7
DEF_Y.5
BRI.6
HUE.6
DEF_Y.4
BRI.5
HUE.5
DEF_Y.3
DEF_C.7
DEF_C.6
DEF_C.5
RES
AD_P60_EN
LE
AD_SEC525_EN
AD_RESULT.2
IDENT.6
PAL SW LOCK
INTERLACE
AD_RESULT.1
IDENT.5
FSC NSTD
STD FLD LEN
DCT.1
DCT.0
CSFM.1
CSFM.0
WYSFMOVR
TRI_LLC
EN28XTAL
VS_JIT_COMP_EN
SWPC
AUTO_PDC_EN
CTA.2
Bit 1
INSEL.1
CAGT.1
CAGT.0
CMG.7
CMG.6
LAGT.1
LGAT.0
SD_DUP_AV
CON.3
CON.2
CON.1
CON.0
BRI.4
HUE.4
DEF_Y.2
BRI.3
HUE.3
DEF_Y.1
BRI.2
HUE.2
DEF_Y.0
BRI.0
HUE.0
DEF_VAL_EN
DEF_C.4
SUB_USR_EN.0
DEF_C.3
DEF_C.2
BRI.1
HUE.1
DEF_VAL_
AUTO_EN
DEF_C.1
DEF_C.0
PDBP
AD_RESULT.0
IDENT.4
LL NSTD
FREE_RUN_ACT
CCLEN
FOLLOW_PW
IDENT.3
MV AGC DET
FSC_LOCK
IDENT.2
MV PS DET
SD_OP_50 Hz
LOST_LOCK
IDENT.1
MVCS T3
GEMD
IN_LOCK
IDENT.0
MVCS DET
INST_HLOCK
YSFM.4
YSFM.3
YSFM.2
YSFM.1
YSFM.0
WYSFM.4
WYSFM.3
WYSFM.2
WYSFM.1
WYSFM.0
NSFSEL.1
NSFSEL.0
PSFSEL.1
PSFSEL.0
LTA.1
LTA.0
CTA.1
CTA.0
CKE
LAGC.2
Bit 0
INSEL.0
CON.4
PWRDN
COL_KILL
IDENT.7
CSFM.2
Bit 2
INSEL.2
TE
Bit 6
VID_SEL.2
ENHSPLL
O
Default Value C
ADI Control
Power
Management
Status 1
Ident
Status 2
Status 3
Analog Clamp
Control
Digital Clamp
Control 1
Reserved
Shaping Filter
Control
Shaping Filter
Control 2
Comb Filter
Control
Reserved
ADI Control 2
Reserved
Pixel Delay
Control
Reserved
Misc Gain
Control
AGC Mode
Control
Chroma Gain
Control 1
Chroma Gain
Control 2
Luma Gain
Control 1
Bit 7
VID_SEL.3
B
SO
Register
Name
Input Control
Video
Selection
Reserved
Output
Control
Extended
Output
Control
Reserved
Reserved
Autodetect
Enable
Contrast
Reserved
Brightness
Hue
Default Value Y
PW_UPD
LAGC.1
CMG.5
LAGC.0
CMG.4
CAGC.1
CAGC.0
CMG.11
CMG.10
CMG.9
CMG.8
CMG.3
CMG.2
CMG.1
CMG.0
LMG.11
LMG.10
LMG.9
LMG.8
Rev. B | Page 64 of 100
ADV7181B
Bit 7
LMG.7
Bit 6
LMG.6
VSBHO
VSBHE
VSEHO
VSEHE
Bit 5
LMG.5
Bit 4
LMG.4
Bit 3
LMG.3
NEWAVMODE
HVSTIM
Bit 2
LMG.2
Bit 1
LMG.1
Bit 0
LMG.0
HSE.10
HSE.9
HSE.8
HSB.9
HSB.8
HSB.7
HSB.6
HSB.5
HSB.4
HSB.3
HSB.2
HSB.1
HSB.0
HSE.7
HSE.6
HSE.5
HSE.4
HSE.3
HSE.2
HSE.1
HSE.0
PHS
CTAPSN.1
CTAPSN.0
PVS
CCMN.2
CCMN.1
CTAPSP.1
CTAPSP.0
CCMP.2
CCMP.1
SFL_INV
CKILLTHR.1
CKILLTHR.0
PF
CCMN.0
YCMN.2
YCMN.1
PCLK
YCMN.0
CCMP.0
YCMP.2
YCMP.1
YCMP.0
PWRDN_AD C_0
PWRDN_AD C_1
PWRDN_ADC_2
LE
CKILLTHR.2
TE
HSB.10
GDECEL.14
GDECEL.6
GDECOL.14
GDECOL.6
GDECEL.13
GDECEL.5
GDECOL.13
GDECOL.5
GDECEL.12
GDECEL.4
GDECOL.12
GDECOL.4
GDECEL.11
GDECEL.3
GDECOL.11
GDECOL.3
GDECEL.10
GDECEL.2
GDECOL.10
GDECOL.2
GDECEL.9
GDECEL.1
GDECOL.9
GDECOL.1
CTI_C_TH.7
CTI_C_TH.6
DNR_EN
CTI_C_TH.5
CTI_C_TH.4
CTI_AB.1
CTI_C_TH.3
CTI_AB.0
CTI_C_TH.2
CTI_AB_EN
CTI_C_TH.1
GDECEL.8
GDECEL.0
GDECOL.8
GDECOL.0
GDECAD
CTI_EN
CTI_C_TH.0
DNR_TH.7
FSCLE
DNR_TH.6
SRLS
DNR_TH.5
COL.2
DNR_TH.4
COL.1
DNR_TH.3
COL.0
DNR_TH.2
CIL.2
DNR_TH.1
CIL.1
DNR_TH.0
CIL.0
LLC_PAD_SEL.2
LLC_PAD_SEL.1
LLC_PAD_SEL.0
WSS1.6
WSS2.6
EDTV1.6
EDTV2.6
EDTV3.6
CGMS1.6
CGMS2.6
CGMS3.6
CCAP1.6
CCAP2.6
LB_LCT.6
LB_LCM.6
LB_LCB.6
WSS1.5
WSS2.5
EDTV1.5
EDTV2.5
EDTV3.5
CGMS1.5
CGMS2.5
CGMS3.5
CCAP1.5
CCAP2.5
LB_LCT.5
LB_LCM.5
LB_LCB.5
WSS1.4
WSS2.4
EDTV1.4
EDTV2.4
EDTV3.4
CGMS1.4
CGMS2.4
CGMS3.4
CCAP1.4
CCAP2.4
LB_LCT.4
LB_LCM.4
LB_LCB.4
CGMSD
WSS1.3
WSS2.3
EDTV1.3
EDTV2.3
EDTV3.3
CGMS1.3
CGMS2.3
CGMS3.3
CCAP1.3
CCAP2.3
LB_LCT.3
LB_LCM.3
LB_LCB.3
EDTVD
WSS1.2
WSS2.2
EDTV1.2
EDTV2.2
EDTV3.2
CGMS1.2
CGMS2.2
CGMS3.2
CCAP1.2
CCAP2.2
LB_LCT.2
LB_LCM.2
LB_LCB.2
CCAPD
WSS1.1
WSS2.1
EDTV1.1
EDTV2.1
EDTV3.1
CGMS1.1
CGMS2.1
CGMS3.1
CCAP1.1
CCAP2.1
LB_LCT.1
LB_LCM.1
LB_LCB.1
WSSD
WSS1.0
WSS2.0
EDTV1.0
EDTV2.0
EDTV3.0
CGMS1.0
CGMS2.0
CGMS3.0
CCAP1.0
CCAP2.0
LB_LCT.0
LB_LCM.0
LB_LCB.0
ADC0_SW.1
ADC2_SW.1
ADC0_SW.0
ADC2_SW.0
B
SO
GDECEL.15
GDECEL.7
GDECOL.15
GDECOL.7
WSS1.7
WSS2.7
EDTV1.7
EDTV2.7
EDTV3.7
CGMS1.7
CGMS2.7
CGMS3.7
CCAP1.7
CCAP2.7
LB_LCT.7
LB_LCM.7
LB_LCB.7
O
Register
Name
Luma Gain
Control 2
Vsync Field
Control 1
Vsync Field
Control 2
Vsync Field
Control 3
Hsync
Position
Control 1
Hsync
Position
Control 2
Hsync
Position
Control 3
Polarity
NTSC Comb
Control
PAL Comb
Control
ADC Control
Reserved
Manual
Window
Control
Reserved
Resample
Control
Reserved
Gemstar Ctrl 1
Gemstar Ctrl 2
Gemstar Ctrl 3
Gemstar Ctrl 4
Gemstar Ctrl 5
CTI DNR Ctrl 1
CTI DNR Ctrl 2
Reserved
CTI DNR Ctrl 4
Lock Count
Reserved
Free Run Line
Length 1
Reserved
VBI Info
WSS 1
WSS 2
EDTV 1
EDTV 2
EDTV 3
CGMS 1
CGMS 2
CGMS 3
CCAP 1
CCAP 2
Letterbox 1
Letterbox 2
Letterbox 3
Reserved
CRC Enable
Reserved
ADC Switch 1
ADC Switch 2
Reserved
CRC_ENABLE
ADC1_SW.3
ADC_SW_M AN
ADC1_SW.2
ADC1_SW.1
ADC1_SW.0
ADC0_SW.3
ADC2_SW.3
Rev. B | Page 65 of 100
ADC0_SW.2
ADC2_SW.2
ADV7181B
Bit 6
Bit 5
Bit 4
LB_TH.4
Bit 3
LB_TH.3
Bit 2
LB_TH.2
Bit 1
LB_TH.1
Bit 0
LB_TH.0
LB_SL.3
LB_SL.2
LB_SL.1
LB_SL.0
LB_EL.3
LB_EL.2
LB_EL.1
LB_EL.0
SD_OFF_CB.7
SD_OFF_CR.7
SD_SAT_CB.7
SD_OFF_CB.6
SD_OFF_CR.6
SD_SAT_CB.6
SD_OFF_CB.5
SD_OFF_CR.5
SD_SAT_CB.5
SD_OFF_CB.4
SD_OFF_CR.4
SD_SAT_CB.4
SD_OFF_CB.3
SD_OFF_CR.3
SD_SAT_CB.3
SD_OFF_CB.2
SD_OFF_CR.2
SD_SAT_CB.2
SD_OFF_CB.1
SD_OFF_CR .1
SD_SAT_CB.1
SD_OFF_CB.0
SD_OFF_CR.0
SD_SAT_CB.0
SD_SAT_CR.7
SD_SAT_CR.6
SD_SAT_CR.5
SD_SAT_CR.4
SD_SAT_CR.3
SD_SAT_CR.2
SD_SAT_CR.1
SD_SAT_CR.0
NVBEGDEL O
NVBEGDEL E
NVBEGSIGN
NVBEG.4
NVBEG.3
NVBEG.2
NVBEG.1
NVBEG.0
NVENDDEL O
NVENDDEL E
NVENDSIGN
NVEND.4
NVEND.3
NVEND.2
NVEND.1
NVEND.0
NFTOGDEL O
NFTOGDEL E
NFTOGSIGN
NFTOG.4
NFTOG.3
NFTOG.2
NFTOG.1
NFTOG.0
PVBEGDEL O
PVBEGDEL E
PVBEGSIGN
PVBEG.4
PVBEG.3
PVBEG.2
PVBEG.1
PVBEG.0
PVENDDEL O
PFTOGDEL O
PVENDDEL E
PFTOGDEL E
PVENDSIGN
PFTOGSIGN
PVEND.4
PFTOG.4
PVEND.3
PFTOG.3
PVEND.2
PFTOG.2
PVEND.1
PFTOG.1
PVEND.0
PFTOG.0
DR_STR_C.0
DR_STR_S.1
DR_STR_S.0
IFFILTSEL.2
IFFILTSEL.1
IFFILTSEL.0
VS_COAST_
MODE.0
EXTEND_VS_
MIN_FREQ
EXTEND_VS_
MAX_FREQ
LE
DR_STR.1
TE
Bit 7
DR_STR.0
DR_STR_C.1
VS_COAST_
MODE.1
O
B
SO
Register
Name
Letterbox
Control 1
Letterbox
Control 2
Reserved
Reserved
Reserved
SD Offset Cb
SD Offset Cr
SD Saturation
Cb
SD Saturation
Cr
NTSC V Bit
Begin
NTSC V Bit
End
NTSC F Bit
Toggle
PAL V Bit
Begin
PAL V Bit End
PAL F Bit
Toggle
Reserved
Drive
Strength
Reserved
IF Comp
Control
VS Mode
Control
Rev. B | Page 66 of 100
ADV7181B
I2C REGISTER MAP DETAILS
The following registers are located in Register Access Page 2.
Table 83. Interrupt Register Map Bit Names 1
rw
Interrupt
Config 0
Reserved
Interrupt
Status 1
Interrupt
Clear 1
Interrupt
Maskb 1
0001 x000
rw
Subaddress
Dec
Hex
64
0x40
r
65
66
0x41
0x42
w
67
0x43
x000 0000
x000 0000
Reserved
Interrupt
Status 2
rw
68
0x44
r
69
70
0x45
0x46
Interrupt
Clear 2
0xxx 0000
w
71
0x47
Interrupt
Maskb 2
0xxx 0000
rw
72
0x48
Raw Status 3
r
73
0x49
Interrupt
Status 3
r
74
0x4A
w
75
0x4B
Interrupt
Maskb 3
Bit 5
Bit 4
Bit 2
Bit 1
Bit 0
MV_INTRQ
MV_INTRQ
MPU_
DUR_SEL.1
DUR_SEL.0
_SEL.1
_SEL.0
STIM_INTRQ
INTRQ_
OP_SEL.1
INTRQ_
OP_SEL.0
MV_PS_
CS_Q
SD_FR_
CHNG_Q
SD_
UNLOCK_Q
SD_LOCK_
Q
MV_PS_
CS_CLR
SD_FR_
CHNG_CLR
SD_UNLO
CK_CLR
SD_LOCK
_CLR
MV_PS_
CS_MSKB
SD_FR_
CHNG_
MSKB
SD_
UNLOCK_
MSKB
SD_LOCK
_MSKB
MPU_
STIM_
INTRQ_Q
MPU_
STIM_INT
RQ_CLR
MPU_
STIM_INT
RQ_MSKB
xx00 0000
rw
76
0x4C
PAL_SW_
LK_
CHNG_Q
PAL_SW_
LK_CHNG
_CLR
PAL_SW_
LK_CHNG
_MSKB
Bit 3
SCM_
LOCK
SCM_
LOCK_
CHNG_Q
SCM_
LOCK_
CHNG_CLR
SCM_
LOCK_CH
NG_MSKB
WSS_
CHNGD_Q
CGMS_
CHNGD_Q
GEMD_Q
CCAPD_Q
WSS_
CHNGD_
CLR
WSS_CHN
GD_MSKB
CGMS_
CHNGD_
CLR
CGMS_
CHNGD_
MSKB
SD_H_
LOCK
SD_H_
LOCK_
CHNG_Q
SD_H_
LOCK_
GEMD_
CLR
CCAPD_
CLR
GEMD_
MSKB
CCAPD_
MSKB
SD_AD_
CHNG_Q
SD_AD_
CHNG_
CLR
SD_AD_
CHNG_
MSKB
CHNG_CLR
SD_H_
LOCK_CH
NG_MSKB
To access the Interrupt Register map, the bits of the register access page[1:0] in Register Address 0x0E must be programmed to 01b.
O
1
xx00 0000
Bit 6
INTRQ_
B
SO
Interrupt
Clear 3
Bit 7
INTRQ_
TE
Reset
Value
LE
Register
Name
Rev. B | Page 67 of 100
SD_V_
SD_OP_
LOCK
50HZ
SD_V_
SD_OP_
LOCK_
CHNG_Q
CHNG_Q
SD_V_LO SD_OP_
CK_CHNG CHNG_CLR
_CLR
SD_V_
SD_OP_
LOCK_CH
CHNG_
NG_MSKB
MSKB
ADV7181B
Table 84. Interrupt Register Map Details
Register
Interrupt
Config 1
Register
Access
Page 2
Bit Description
INTRQ_OP_SEL[1:0].
Interrupt Drive Level Select.
7
6
Bit
3
2
SD_LOCK_Q.
Read Only
SD_UNLOCK_Q.
Register
Access
Page 2
x
0
0
1
1
x
0
1
0
1
x
0
0
1
1
0
1
0
1
x
x
x
O
0x43
Interrupt
Clear 1
x
Notes
x
0
1
No change
SD input has caused the decoder
to go from an unlocked state to
a locked state
No change
SD input has caused the
decoder to go from a locked
state to an unlocked state
These bits
can be
cleared or
masked in
Registers
0x43 and
0x44,
respectively.
x
x
0
1
No change
Denotes a change in the freerun status
No change
Pseudo sync/color striping
detected; see
0
1
MV_INTRQ_SEL[1:0],
Macrovision Interrupt
Selection Bits, Address 0x40
(Interrupt Space)[5:4] for
selection
x
0
1
SD_UNLOCK_CLR.
0
1
Reserved.
Reserved.
Reserved.
SD_FR_CHNG_CLR.
0
0
0
0
1
MV_PS_CS_CLR.
Reserved.
Comments
Open drain
Drive low when active
Drive high when active
Reserved
Manual interrupt mode disabled
Manual interrupt mode enabled
Not used
Reserved
Pseudo sync only
Color stripe only
Pseudo sync or color stripe
3 Xtal periods
15 Xtal periods
63 Xtal periods
Active until cleared
x
Write Only
Register
Access
Page 2
x
0
1
MV_PS_CS_Q.
Reserved.
SD_LOCK_CLR.
0
0
1
0
1
0
1
B
SO
Reserved.
Reserved.
Reserved.
SD_FR_CHNG_Q.
1
0
0
1
1
LE
INTRQ_DUR_SEL[1:0].
Interrupt Duration Select.
Reserved
Interrupt
Status 1
4
MPU_STIM_INTRQ[1:0].
Manual Interrupt Set Mode.
Reserved.
MV_INTRQ_SEL[1:0].
Macrovision Interrupt
Select.
0x41
0x42
5
TE
Subaddress
0x40
0
1
x
Rev. B | Page 68 of 100
Do not clear
Clears SD_LOCK_Q bit
Do not clear
Clears SD_UNLOCK_Q bit
Not used
Not used
Not used
Do not clear
Clears SD_FR_CHNG_Q bit
Do not clear
Clears MV_PS_CS_Q bit
Not used
ADV7181B
Subaddress
0x44
Register
Interrupt
Mask 1
Bit Description
SD_LOCK_MSKB.
7
6
5
4
Bit
3
2
SD_UNLOCK_MSKB.
Register
Access
Page 2
0
1
Reserved.
Reserved.
Reserved.
SD_FR_CHNG_MSKB.
0
0
0
0
1
MV_PS_CS_MSKB.
Reserved.
0x45
0x46
Reserved
Interrupt
Status 2
0
0
1
0
1
x
x
x
x
x
CCAPD_Q.
x
x
x
x
0
1
Register
Access
Page 2
GEMD_Q.
0
1
CGMS_CHNGD_Q.
0
1
B
SO
WSS_CHNGD_Q.
Reserved.
Reserved.
Reserved.
MPU_STIM_INTRQ_Q.
0x47
Interrupt
Clear 2
0
1
x
x
x
0
1
CCAPD_CLR.
0
1
GEMD_CLR.
0
1
O
Write Only
Register
Access
Page 2
CGMS_CHNGD_CLR.
0
1
WSS_CHNGD_CLR.
Reserved.
Reserved.
Reserved.
MPU_STIM_INTRQ_CLR.
Notes
Closed captioning not detected
in the input video signal
Closed captioning data detected
in the video input signal
Gemstar data not detected in
the input video signal
Gemstar data detected in the
input video signal
No change detected in CGMS
data in the input video signal
A change is detected in the
CGMS data in the input video
signal
No change detected in WSS
data in the input video signal
A change is detected in the WSS
data in the input video signal
Not used
Not used
Not used
Manual interrupt not set
Manual interrupt set
Do not clear
Clears CCAPD_Q bit
Do not clear
Clears GEMD_Q bit
Do not clear
Clears CGMS_CHNGD_Q bit
Do not clear
Clears WSS_CHNGD_Q bit
Not used
Not used
Not used
Do not clear
Clears MPU_STIM_INTRQ_Q bit
These bits
can be
cleared or
masked by
Registers
0x47 and
0x48,
respectively.
LE
Read Only
Register
Comments
Masks SD_LOCK_Q bit
Unmasks SD_LOCK_Q bit
Masks SD_UNLOCK_Q bit
Unmasks SD_UNLOCK_Q bit
Not used
Not used
Not used
Masks SD_FR_CHNG_Q bit
Unmasks SD_FR_CHNG_Q bit
Masks MV_PS_CS_Q bit
Unmasks MV_PS_CS_Q bit
Not used
TE
Read/Write
Register
1
0
1
x
x
x
0
1
Rev. B | Page 69 of 100
ADV7181B
Subaddress
0x48
Register
Interrupt
Mask 2
Bit Description
CCAPD_MSKB.
7
6
5
4
Bit
3
2
GEMD_MSKB.
CGMS_CHNGD_MSKB.
Raw
Status 3
Read Only
Register
0
1
WSS_CHNGD_MSKB.
Reserved.
Reserved.
Reserved.
MPU_STIM_INTRQ_MSKB.
0x49
0
1
0
1
0
0
0
0
SD_OP_50Hz.
SD 60/50Hz frame rate at
output.
SD_V_LOCK.
0
1
0
1
Register
Access
Page 2
SD_H_LOCK.
x
B
SO
0
1
Interrupt
Status 3
Read Only
Register
Register
Access
Page 2
Reserved.
Reserved.
Reserved.
SD_OP_CHNG_Q.
SD 60/50 Hz frame rate at
input.
x
x
x
0
1
SD_V_LOCK_CHNG_Q.
SD_H_LOCK_CHNG_Q.
O
0x4A
0
1
Reserved.
SCM_LOCK.
SECAM Lock.
0
1
0
1
SD_AD_CHNG_Q.
SD autodetect changed.
x
SCM_LOCK_CHNG_Q.
SECAM Lock.
0
1
PAL_SW_LK_CHNG_Q.
Reserved.
Reserved.
Comments
Masks CCAPD_Q bit
Unmasks CCAPD_Q bit
Masks GEMD_Q bit
Unmasks GEMD_Q bit
Masks CGMS_CHNGD_Q bit
Unmasks CGMS_CHNGD_Q bit
Masks WSS_CHNGD_Q bit
Unmasks WSS_CHNGD_Q bit
Not used
Not used
Not used
Masks MPU_STIM_INTRQ_Q bit
Unmasks MPU_STIM_INTRQ_Q
bit
SD 60 Hz signal output
SD 50 Hz signal output
TE
Register
Access
Page 2
0
0
1
SD vertical sync lock not
established
SD vertical sync lock established
SD horizontal sync lock not
established
SD horizontal sync lock
established
Not used
SECAM lock not established
SECAM lock established
Not used
Not used
Not used
No change in SD signal standard
detected at the input
A change in SD signal standard
is detected at the input
No change in SD vertical sync
lock status
SD vertical sync lock status has
changed
No change in SD horizontal sync
lock status
SD horizontal sync lock status
has changed
No change in AD_RESULT[2:0]
bits in Status Register 1
AD_RESULT[2:0] bits in Status
Register 1 have changed
No change in SECAM lock status
SECAM lock status has changed
No change in PAL swinging
burst lock status
PAL swinging burst lock status
has changed
Not used
Not used
LE
Read/
Write
1
x
x
x
Rev. B | Page 70 of 100
Notes
These bits
cannot be
cleared or
masked.
Register
0x4A is used
for this
purpose.
These bits
can be
cleared and
masked by
Registers
0x4B and
0x4C,
respectively.
ADV7181B
Subaddress
0x4B
Register
Interrupt
Clear 3
Bit Description
SD_OP_CHNG_CLR.
7
6
5
4
Bit
3
2
SD_V_LOCK_CHNG_CLR.
Register
Access
Page 2
0
1
SD_H_LOCK_CHNG_CLR.
0
1
SD_AD_CHNG_CLR.
0
1
SCM_LOCK_CHNG_CLR.
0
1
PAL_SW_LK_CHNG_CLR.
0x4C
Interrupt
Mask 2
Reserved.
Reserved.
SD_OP_CHNG_MSKB.
0
1
x
x
0
1
Register
Access
Page 2
0
1
SD_H_LOCK_CHNG_MSKB.
SD_AD_CHNG_MSKB.
0
1
0
1
0
1
B
SO
SCM_LOCK_CHNG_MSKB.
PAL_SW_LK_CHNG_MSKB.
0
1
x
x
O
Reserved.
Reserved.
Comments
Do not clear
Clears SD_OP_CHNG_Q bit
Do not clear
Clears SD_V_LOCK_CHNG_Q bit
Do not clear
Clears SD_H_LOCK_CHNG_Q bit
Do not clear
Clears SD_AD_CHNG_Q bit
Do not clear
Clears SCM_LOCK_CHNG_Q bit
Do not clear
Clears PAL_SW_LK_CHNG_Q bit
Not used
Not used
Masks SD_OP_CHNG_Q bit
Unmasks SD_OP_CHNG_Q bit
Masks SD_V_LOCK_CHNG_Q bit
Unmasks SD_V_LOCK_CHNG_Q
bit
Masks SD_H_LOCK_CHNG_Q bit
Unmasks SD_H_LOCK_CHNG_Q
bit
Masks SD_AD_CHNG_Q bit
Unmasks SD_AD_CHNG_Q bit
Masks SCM_LOCK_CHNG_Q bit
Unmasks SCM_LOCK_CHNG_Q
bit
Masks PAL_SW_LK_CHNG_Q bit
Unmasks PAL_SW_LK_CHNG_Q
bit
Not used
Not used
LE
SD_V_LOCK_CHNG_MSKB.
Read /
Write
Register
0
0
1
TE
Write Only
Register
1
Rev. B | Page 71 of 100
Notes
ADV7181B
Table 85. Common and Normal (Page 1) Register Map Details
Register
Bit Description
0x00
Input
Control
INSEL[3:0]. The INSEL bits allow the
user to select an input channel as
well as the input format.
7 6
0 0
0
Bits
4 3
0
0
0
0
0
0
0
0
1
1
1
2
0
0
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
0
0
1
0
1
0
1
0
1
0
1
0
Comments
1
1
1
1
1
0
1
1
1
1
1
0
0
1
1
1
0
1
0
1
Reserved
Reserved
Reserved
Reserved
Reserved
Autodetect PAL
(B/G/H/I/D), NTSC
(without pedestal), SECAM
Autodetect PAL
(B/G/H/I/D), NTSC-M (with
pedestal), SECAM
Autodetect PAL (N), NTSC
(M) (without pedestal),
SECAM
Autodetect PAL (N), NTSC
(M) (with pedestal),
SECAM
NTSC-J
NTSC-M
PAL60
NTSC-4.43
PAL-B/G/H/I/D
PAL-N (B/G/H/I/D without
pedestal)
PAL-M (without pedestal)
PAL-M
PAL-combination N
PAL-combination N
SECAM (with pedestal)
SECAM (with pedestal)
Set to default
Disable Vsync processor
Enable Vsync processor
Set to default
Standard video input
Betacam input enable
Disable Hsync processor
Enable Hsync processor
Set to default
0
Composite
Reserved
Reserved
Reserved
Reserved
Reserved
S-Video
Reserved
Reserved
YPrPb
Reserved
LE
VID_SEL[3:0]. The VID_SEL bits allow
the user to select the input video
standard.
5
0
1
0 0
1
0
0 0
1
1
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
0
0
0
1
0
1
0
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
1
0x01
O
B
SO
0 0
Video
Selection
Reserved.
ENVSPROC.
0
0
1
Reserved.
BETACAM.
0
0
1
ENHSPL.
Reserved.
Notes
TE
Subaddress
0
1
1
Rev. B | Page 72 of 100
0
0
ADV7181B
Register
Bit Description
0x03
Output
Control
SD_DUP_AV. Duplicates the AV
codes from the Luma into the
chroma path.
7 6
5
Bits
4 3
2
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
1
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
AV codes to suit 8-bit
interleaved data output
AV codes duplicated (for
16-bit interfaces)
Set as default
Reserved
Reserved
16-bit @ LLC1 4:2:2
8-bit @ LLC1 4:2:2
ITU-R BT.656
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Output pins enabled
LE
Reserved.
OF_SEL[3:0]. Allows the user to
choose from a set of output formats.
Comments
TOD. Three-state output drivers.
This bit allows the user to threestate the output drivers: P[19:0], HS,
VS, FIELD, and SFL.
0
1
B
SO
Extended
Output
Control
0
1
0
1
BL_C_VBI. Blank chroma during VBI.
If set, enables data in the VBI region
to be passed through the decoder
undistorted.
TIM_OE. Timing signals output
enable.
Reserved.
Reserved.
BT656-4. Allows the user to select an
output mode compatible with
ITU- R BT656-3/4.
0
1
0
1
x
See TIM_OE,
Address 0x04[3] and
TRI_LLC, Address
0x1D[7]
Drivers three-stated
All lines filtered and scaled
Only active video region
filtered
0
1
O
0x04
VBI_EN. Allows VBI data (Lines 1 to
21) to be passed through with only
a minimum amount of filtering
performed.
RANGE. Allows the user to select the
range of output values. Can be
BT656-compliant, or can fill the
whole accessible number range.
EN_SFL_PIN.
Notes
TE
Subaddress
16 < Y < 235, 16 < C < 240
1 < Y < 254, 1 < C < 254
ITU-R BT.656.
Extended range.
SFL output is disabled
SFL information output on
the SFL pin
SFL output enables
encoder and
decoder to be
connected directly.
During VBI.
Decode and output color
Blank Cr and Cb
HS, VS, F three-stated
HS, VS, F forced active
x
1
0
1
Rev. B | Page 73 of 100
BT656-3-compatible
BT656-4-compatible
Controlled by TOD.
ADV7181B
Subaddress
Register
Bit Description
0x07
AutodetectE
AD_PAL_EN. PAL B/G/I/H autodetect
enable.
nable
7 6
5
Bits
4 3
2
AD_NTSC_EN. NTSC autodetect
enable.
1
0
0
1
0
1
AD_PALM_EN. PAL M autodetect
enable.
1
Enable
Disable
0
1
0
1
AD_N443_EN. NTSC443 autodetect
enable.
Enable
Disable
0
1
Enable
Disable
0
LE
AD_SECAM_EN. SECAM autodetect
enable.
Enable
Disable
TE
AD_P60_EN. PAL60 autodetect
enable.
1
AD_SEC525_EN. SECAM 525
autodetect enable.
0
0
0
0
0
0
Reserved.
BRI[7:0]. This register controls the
brightness of the video signal.
1 0
0 0
0
0
0
0
0
0
0
0
0
0
0
0
HUE[7:0]. This register contains the
value for the color hue adjustment.
DEF_VAL_EN. Default value enable.
0 0
0
0
0
0
0
0
CON[7:0]. Contrast adjust. This is the
user control for contrast adjustment.
0x09
0x0A
Reserved
Brightness
Register
0x0B
Hue
Register
Default
Value Y
B
SO
Contrast
Register
0x0C
Enable
Disable
0
1
1 0
0x08
0
1
0
1
0x0E
O
DEF_VAL_AUTO_EN. Default value.
0x0D
Enable
Luma gain = 1
Free-run mode dependent
on DEF_VAL_AUTO_EN
Force free-run mode on
and output blue screen
Disable free-run mode
Enable automatic free-run
mode (blue screen)
0 0
1
1
0
1
Default
Value C
DEF_C[7:0]. Default value C. The Cr
and Cb default values are defined in
this register.
0 1
1
1
1
1
0
0
Cr[7:0] = DEF_C[7:4],0, 0, 0, 0}
Cb[7:0] = DEF_C[3:0], 0, 0, 0, 0}
ADI
Control
Reserved.
0
0
0
0
0
Set as default
Reserved.
0
1
0 0
Rev. B | Page 74 of 100
0x00 Gain = 0;
0x80 Gain = 1;
0xFF Gain = 2.
0x00 = 0IRE;
0x7F = +100IRE;
0x80 = –100IRE.
Hue range =
–90° to +90°.
DEF_Y[5:0]. Default value Y. This
register holds the Y default value.
SUB_USR_EN. Enables the user to
access the Interrupt map.
Notes
Disable
Enable
Disable
Enable
Disable
0
AD_PALN_EN. PAL N autodetect
enable.
Comments
Y[7:0] = {DEF_Y[5:0],0, 0}
Access user reg map
Access interrupt reg map
Set as default
When lock is lost,
free-run mode can
be enabled to
output stable
timing, clock, and a
set color.
Default Y value
output in free-run
mode.
Default Cb/Cr value
output in free-run
mode. Default
values give blue
screen output.
See Figure 37.
ADV7181B
Subaddress
Register
Bit Description
0x0F
Power
Reserved.
7 6
5
Bits
4 3
2
1
0
0
0
Comments
Notes
Set to default
Management
PDBP. Power-down bit priority
selects between PWRDN bit and PIN.
0
0
Chip power-down
controlled by pin
Bit has priority (pin
disregarded)
Set to default
System functional
Powered down
Set to default
Normal operation
1
Start reset sequence
1
Reserved.
PWRDN. Power-down places the
decoder in a full power-down mode.
0x10
Status
Register 1.
(Read
Only)
0
0
Executing reset
takes approximately
2 ms. This bit is selfclearing.
Provides
information about
the internal status
of the decoder.
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Detected standard.
x
x
x
IN_LOCK.
LOST_LOCK.
FSC_LOCK.
x
x
FSC lock (right now) = 1
x
Peak white AGC mode
active = 1
NTSM-MJ
NTSC-443
PAL-M
PAL-60
PAL-B/G/H/I/D
SECAM
PAL-combination N
SECAM 525
Color kill is active = 1
LE
FOLLOW_PW.
In lock (right now) = 1
Lost lock (since last read) = 1
x
0x11
0x12
B
SO
AD_RESULT[2:0]. Autodetection
result reports the standard of the
input video.
(Read Only)
COL_KILL.
IDENT[7:0] Provides identification
on the revision of the part.
Status
Register 2
MVCS DET.
MVCS T3.
IDENT
(Read Only)
x
x
O
MV PS DET.
MV AGC DET.
LL NSTD.
FSC NSTD.
0x13
Status
Register 3
(Read Only)
Reserved.
INST_HLOCK.
x
x
x
x
x
x
MV pseudo sync detected
MV AGC pulses detected
Nonstandard line length
FSC frequency
nonstandard
x
x
x
x
x
x
x
x
INTERLACED.
MV color striping detected
MV color striping type
Color kill.
ADV7181B = 0x13.
1 = detected.
0 = Type 2,
1 = Type 3.
1 = detected.
1 = detected.
1 = detected.
1 = detected.
x
GEMD.
SD_OP_50HZ.
Reserved.
FREE_RUN_ACT.
STD FLD_LEN.
PAL_SW_LOCK.
x
x
x
See PDBP, 0x0F Bit 2.
TE
Reserved.
RES. Chip reset loads all I2C bits with
default values.
0
0
1
x
x
Rev. B | Page 75 of 100
1 = horizontal lock
achieved
1 = Gemstar data detected
SD 60 Hz detected
SD 50 Hz detected
1 = Free-run mode active
1 = Field length standard
1 = Interlaced video
detected
1 = Swinging burst
detected
Unfiltered.
SD field rate detect.
Blue screen output.
Correct field length
found.
Field sequence
found.
Reliable swinging
burst sequence.
ADV7181B
Shaping
Filter
Control
5
Reserved.
CCLEN. Current clamp enable allows
the user to switch off the current
sources in the analog front.
Bits
4 3
0
0
2
0
1
1
0
0
Comments
0 0
0 0
0
1
Set to default
Current sources switched
off
Current sources enabled
Set to default
Set to default
Slow (TC = 1 sec)
Medium (TC = 0.5 sec)
Fast (TC = 0.1 sec)
TC dependent on video
Set to default
Auto wide notch for poor
quality sources or wideband filter with comb for
good quality input
Auto narrow notch for
poor quality sources or
wideband filter with comb
for good quality input
SVHS 1
SVHS 2
SVHS 3
SVHS 4
SVHS 5
SVHS 6
SVHS 7
SVHS 8
SVHS 9
SVHS 10
SVHS 11
SVHS 12
SVHS 13
SVHS 14
SVHS 15
SVHS 16
SVHS 17
SVHS 18 (CCIR601)
PAL NN1
PAL NN2
PAL NN3
PAL WN 1
PAL WN 2
NTSC NN1
NTSC NN2
NTSC NN3
NTSC WN1
NTSC WN2
NTSC WN3
Reserved
Auto selection 15 MHz
Auto selection 2.17 MHz
0
0
1
1
1
1
0
1
0
1
0
1
SH1
SH2
SH3
SH4
SH5
Wideband mode
1
Reserved.
Reserved.
DCT[1:0]. Digital clamp timing
determines the time constant of the
digital fine clamp circuitry.
0 0
0
0
0
1
1
0
1
0
1
Reserved.
YSFM[4:0]. Selects Y Shaping Filter
mode when in CVBS only mode.
0
Allows the user to select a wide
range of low-pass and notch filters.
If either auto mode is selected, the
decoder selects the optimum Y filter
depending on the CVBS video
source quality (good vs. bad).
0
x
x
x
x
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
1
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
LE
0x17
Digital
Clamp
Control 1
7 6
B
SO
0x15
Bit Description
O
0x14
Register
Analog
Clamp
Control
CSFM[2:0].
C shaping filter mode allows the
selection from a range of low-pass
chrominance filters, SH1 to SH5 and
wideband mode.
1
1
0
0
1
1
Notes
Decoder selects
optimum Y shaping
filter depending on
CVBS quality.
TE
Subaddress
Rev. B | Page 76 of 100
If one of these
modes is selected,
the decoder does
not change filter
modes. Depending
on video quality, a
fixed filter response
(the one selected) is
used for good and
bad quality video.
Automatically
selects a C filter for
the specified 3 dB
cutoff.
ADV7181B
Subaddress
Register
Bit Description
0x18
Shaping
Filter
Control 2
WYSFM[4:0]. Wideband Y shaping
filter mode allows the user to select
which Y shaping filter is used for the
Y component of Y/C, YPbPr, B/W
input signals; it is also used when a
good quality input CVBS signal is
detected. For all other inputs, the Y
shaping filter chosen is controlled
by YSFM[4:0].
5
Bits
4 3
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 1
0 1
0 1
0 1
0 1
0 1
0 1
0 1
1 0
1 0
1 0
1 0
1 0
~ ~
1 1
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
~
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
~
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
~
1
Comments
Reserved; do not use
Reserved; do not use
SVHS 1
SVHS 2
SVHS 3
SVHS 4
SVHS 5
SVHS 6
SVHS 7
SVHS 8
SVHS 9
SVHS 10
SVHS 11
SVHS 12
SVHS 13
SVHS 14
SVHS 15
SVHS 16
SVHS 17
SVHS 18 (CCIR 601)
Reserved; do not use
Reserved; do not use
Reserved; do not use
LE
TE
7 6
0x19
0
0
0
1
B
SO
Reserved.
WYSFMOVR. Enables the use of
automatic WYSFN filter.
Comb
Filter
Control
PSFSEL[1:0]. Controls the signal
bandwidth that is fed to the comb
filters (PAL).
NSFSEL[1:0]. Controls the signal
bandwidth that is fed to the comb
filters (NTSC).
ADI
Control 2
Reserved.
Reserved.
VS_JIT_COMP_EN.
O
0x1D
1 1
1
0
0
1
0
1
0
x
0
1
EN28XTAL.
TRI_LLC.
1
0
0
1
1
0
1
0
1
Rev. B | Page 77 of 100
0
0
1
1
0
1
0
1
x
x
Set to default
Autoselection of best filter
Manual select filter using
WYSFM[4:0]
Narrow
Medium
Wide
Widest
Narrow
Medium
Medium
Wide
Set as default
Set to default
Enabled
Disabled
Use 27 MHz crystal
Use 28 MHz crystal
LLC pin active
LLC pin three-stated
Notes
ADV7181B
Register
Bit Description
0x27
Pixel Delay
Control
LTA[1:0]. Luma timing adjust allows
the user to specify a timing difference
between chroma and luma samples.
7 6
Reserved.
CTA[2:0]. Chroma timing adjust
allows a specified timing difference
between the luma and chroma
samples.
PW_UPD. Peak white update
determines the rate of gain.
2
1
0
0
0
Comments
Notes
No delay
1
0
Luma 1 clk (37 ns) delayed
1
0
Luma 2 clk (74 ns) early
1
1
Luma 1 clk (37 ns) early
CVBS mode
LTA[1:0] = 00b;
S-Video mode
LTA[1:0]= 01b,
YPrPb mode
LTA[1:0] = 01b.
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
Set to 0
Not valid setting
Chroma +2 pixels (early)
Chroma +1 pixel (early)
No delay
Chroma -1 pixel (late)
Chroma -2 pixels (late)
Chroma -3 pixels (late)
Not valid setting
Use values in LTA[1:0] and
CTA[2:0] for delaying
luma/chroma
0
No swapping
1
Swap the Cr and Cb O/P
samples
Update once per video
line
Update once per field
0
B
SO
1
Reserved.
CKE. Color kill enable allows the
color kill function to be switched on
and off.
AGC Mode
Control
Reserved.
CAGC[1:0]. Chroma automatic gain
control selects the basic mode of
operation for the AGC in the chroma
path.
1
0
0
0
Set to default
Color kill disabled
Color kill enabled
1
Reserved.
LAGC[2:0]. Luma automatic gain
control selects the mode of
operation for the gain control in the
luma path.
Reserved.
0
0
1
O
0x2C
CVBS mode
CTA[2:0] = 011b.
S-Video mode
CTA[2:0] = 101b.
YPrPb mode
CTA[2:0] = 110b.
LTA and CTA values
determined automatically
LE
SWPC. Allows the Cr and Cb samples
to be swapped.
Misc Gain
Control
Bits
4 3
0
0
0
0
0
1
1
1
1
AUTO_PDC_EN. Automatically
programs the LTA/CTA values so
that luma and chroma are aligned at
the output for all modes of
operation.
0x2B
5
TE
Subaddress
0
0
1
0
1
0
1
1
Set to default
Manual fixed gain
Use luma gain for chroma
Automatic gain
0
0
0
0
0
1
Freeze chroma gain
Set to 1
Manual fixed gain
Peak white algorithm off
0
1
0
Peak white algorithm onl
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
AGC no override through
peak white; automatic IRE
control
AGC auto-override through
peak white; automatic IRE
control
AGC active video with
peak white
AGC active video with
average video
Freeze gain
Set to 1
1
1
Rev. B | Page 78 of 100
1
See
Swap_CR_CB_WB,
Addr 0x89.
Peak white must be
enabled. See
LAGC[2:0].
For SECAM color kill,
threshold is set at
8%.
See CKILLTHR[2:0].
Use CMG[11:0].
Based on color
burst.
Use LMG[11:0].
Blank level to sync
tip.
Blank level to sync
tip.
Blank level to sync
tip.
Blank level to sync
tip.
ADV7181B
Register
Bit Description
0x2D
Chroma
Gain
Control 1
CMG[11:8]. Chroma manual gain can
be used to program a desired
manual chroma gain. Reading back
from this register in AGC mode gives
the current gain.
Reserved.
CAGT[1:0]. Chroma automatic gain
timing allows adjustment of the
chroma AGC tracking speed.
7 6
Chroma
Gain
Control 2
CMG[7:0]. Chroma manual gain
lower 8 bits. See CMG[11:8] for
description.
0x2F
Luma Gain
Control 1
LMG[11:8]. Luma manual gain can
be used to program a desired
manual chroma gain, or to read
back the actual gain value used.
Reserved.
LAGT[1:0]. Luma automatic gain
timing allows adjustment of the
luma AGC tracking speed.
1
0
0
1
1
0
0
1
0
1
0
0
1
0
0
1
1
x
0
1
0
1
x
Luma Gain
Control 2
LMG[7:0]. Luma manual gain can be
used to program a desired manual
chroma gain or read back the actual
used gain value.
0x31
VS and
FIELD
Control 1
Reserved.
HVSTIM. Selects where the VS signal
is asserted within a line of video.
x
NEWAVMODE. Sets the EAV/SAV
mode.
Vsync Field
Control 2
2
1
1
0
0
0
1
0
0
x
B
SO
0x30
0x32
Bits
4 3
0
0
0
0
x
x
x
1
Reserved.
Reserved.
VSBHE.
0 0
x
x
x
x
x
0
1
0
0
1
0
1
0
0
0
0
0
0
1
0
0
0
1
0
0
0
O
1
VSBHO.
0x33
Vsync Field
Control 3
Comments
0
1
Reserved.
VSEHE.
0
1
VSEHO.
0
1
Rev. B | Page 79 of 100
Notes
CAGC[1:0] settings
decide in which
mode CMG[11:0]
operates.
Set to 1
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
CMG[11:0] = 750d; gain is
1 in NTSC
CMG[11:0] = 741d; gain is
1 in PAL
LAGC[1:0] settings decide
in which mode LMG[11:0]
operates
Set to 1
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
LMG[11:0] = 1234d; gain is
1 in NTSC LMG[11:0] =
1266d; gain is 1 in PAL
LE
0x2E
5
TE
Subaddress
Set to default
Start of line relative to HSE
Start of line relative to HSB
EAV/SAV codes generated
to suit ADI encoders
Manual VS/field position
controlled by registers
0x32, 0x33, and 0xE5–0xEA
Set to default
Set to default
VS goes high in the middle
of the line (even field)
VS changes state at the
start of the line (even field)
VS goes high in the middle
of the line (odd field)
VS changes state at the
start of the line (odd field)
Set to default
VS goes low in the middle
of the line (even field)
VS changes state at the
start of the line (even
field)
VS goes low in the middle
of the line (odd field)
VS changes state at the
start of the line (odd field)
Has an effect only if
CAGC[1:0] is set to
auto gain (10).
Min value is 0 d
(G = –60 dB)
Max value is 3750
(Gain = 5).
Has an effect only if
LAGC[1:0] is set to
auto gain (001, 010,
011, or 100).
Min value
NTSC 1024 (G = 0.85),
PAL (G = 0.81).
Max value
NTSC 2468 (G = 2),
PAL = 2532 (G = 2).
HSE = Hsync end.
HSB = Hsync begin.
NEWAVMODE bit
must be set high.
NEWAVMODE bit
must be set high.
ADV7181B
Subaddress
Register
Bit Description
0x34
HS Position
Control 1
HSE[10:8]. HS end allows the
positioning of the HS output within
the video line.
Reserved.
HSB[10:8]. HS begin allows the
positioning of the HS output within
the video line.
Reserved.
7 6
0x35
HS Position
Control 2
HSB[7:0] Using HSB[10:0] and
HSE[10:0], the user can program the
position and length of HS output signal.
0x36
HS Position
Control 3
Polarity
HSE[7:0] See Notes, above.
Bits
4 3
0
0
0
0 0
0
0
0
0
1
0
0 0
0
0
0
0
0
0
0
1
0
0
1
Reserved.
PVS. Sets the VS Polarity.
0
0
0
1
O
CCMN[2:0]. Chroma
comb mode, NTSC.
CTAPSN[1:0]. Chroma
comb taps, NTSC.
Comments
Notes
HS output ends HSE[10:0]
pixels after the falling edge
of Hsync
Set to 0
HS output starts HSB[10:0]
pixels after the falling edge
of Hsync
Set to 0
Using HSB and
HSE,the user can
program the
position and length
of the output Hsync.
Invert polarity
Normal polarity as per the
timing diagrams
Set to 0
Active high
Active low
Set to 0
Active high
Active low
Set to 0
Active high
Active low
Adaptive 3-line, 3-tap luma
Use low-pass notch
Fixed luma comb (2-line)
Fixed luma comb (3-Line)
Fixed luma comb (2-line)
LE
YCMN[2:0]. Luma
comb mode, NTSC.
0
0
1
B
SO
NTSC
Comb
Control
0
0
0
Reserved.
PF. Sets the FIELD polarity.
0x38
1
0
0
PCLK. Sets the polarity of LLC1.
Reserved.
PHS. Sets the HS Polarity.
2
0
TE
0x37
5
0
0
1
1
0
1
1
1
1
0
0
0
1
1
0
0
0
1
1
1
0
1
1
1
0
1
0
1
Rev. B | Page 80 of 100
0
0
0
1
1
0
0
1
0
1
Top lines of memory.
All lines of memory.
Bottom lines of
memory.
3-line adaptive for
CTAPSN = 01
4-line adaptive for
CTAPSN = 10
5-line adaptive for
CTAPSN = 11
Disable chroma comb
Fixed 2-line for
CTAPSN = 01
Fixed 3-line for
CTAPSN = 10
Fixed 4-line for
CTAPSN = 11
Fixed 3-line for
CTAPSN = 01
Fixed 4-line for
CTAPSN = 10
Fixed 5-line for
CTAPSN = 11
Fixed 2-line for
CTAPSN = 01
Fixed 3-line for
CTAPSN = 10
Fixed 4-line for
CTAPSN = 11
Adapts 3 lines – 2 lines
Not used
Adapts 5 lines – 3 lines
Adapts 5 lines – 4 lines
Top lines of
memory.
All lines of memory.
Bottom lines of
memory.
ADV7181B
Register
Bit Description
0x39
PAL Comb
Control
YCMP[2:0]. Luma comb mode, PAL.
7 6
5
0
CCMP[2:0]. Chroma comb mode,
PAL.
1
1
Bits
4 3
0
Comments
2
0
1
0
0
0
1
1
0
1
0
0
Adaptive 5-line, 3-tap
luma comb
Use low-pass notch
Fixed luma comb
1
1
1
1
0
1
Fixed luma comb (5-line)
Fixed luma comb (3-line)
0
0
0
Notes
Top lines of
memory.
All lines of memory.
Bottom lines of
memory.
3-line adaptive for
CTAPSN = 01
4-line adaptive for
CTAPSN = 10
5-line adaptive for
CTAPSN = 11
Disable chroma comb
TE
Subaddress
0
1
Fixed 2-line for CTAPSN = 01
Top lines of
memory.
Fixed 3-line for CTAPSN = 10
Fixed 4-line for CTAPSN = 11
1
1
Fixed 3-line for CTAPSN = 01
0
All lines of memory.
LE
Fixed 4-line for CTAPSN = 10
Fixed 5-line for CTAPSN = 11
1
1
Fixed 2-line for CTAPSN = 01
1
Bottom lines of
memory.
Fixed 3-line for CTAPSN = 10
Fixed 4-line for CTAPSN = 11
0 0
0 1
B
SO
CTAPSP[1:0]. Chroma comb taps, PAL.
1 0
1 1
0x3A
Reserved.
PWRDN_ADC_2. Enables powerdown of ADC2.
0
0
1
PWRDN_ADC_1. Enables powerdown of ADC1.
0
1
PWRDN_ADC_0. Enables powerdown of ADC0.
Reserved.
Reserved.
CKILLTHR[2:0].
0 0
0
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Reserved.
0
O
0x3D
Manual
Window
Control
0
1
0
Rev. B | Page 81 of 100
0
1
1
Not used
Adapts 5-lines – 3 lines
(2 taps)
Adapts 5 lines – 3 lines
(3 taps)
Adapts 5 lines – 4 lines
(4 taps)
Set as default
ADC2 normal operation
Power down ADC2
ADC1 normal operation
Power down ADC1
ADC0 normal operation
Power down ADC0
Set as default
Set to default
Kill at 0.5%
Kill at 1.5%
Kill at 2.5%
Kill at 4%
Kill at 8.5%
Kill at 16%
Kill at 32%
Reserved
Set to default
CKE = 1 enables the
color kill function
and must be
enabled for
CKILLTHR[2:0] to
take effect.
ADV7181B
Subaddress
Register
Bit Description
0x41
Resample
Control
Reserved.
SFL_INV. Controls the behavior of
the PAL switch bit.
7 6
5
0
Bits
4 3
1 0
2
0
1
0
0
0
0
1
Reserved.
GDECEL[15:8]. See the Comments
column.
GDECEL[7:0]. See the Comments
column.
0
0 0
0
0
0
0
0
0
0 0
0
0
0
0
0
0
0x4A
Gemstar
Control 3
GDECOL[15:8]. See the Comments
column.
0 0
0
0
0
0x4B
Gemstar
Control 4
GDECOL[7:0]. See the Comments
column.
0 0
0
0
0
0x4C
Gemstar
Control 5
GDECAD. Controls the manner in
which decoded Gemstar data is
inserted into the horizontal blanking
period.
CTI DNR
Control 1
Reserved.
CTI_EN. CTI enable.
x
x
x
x
CTI_AB_EN. Enables the mixing of
the transient improved chroma with
the original signal.
CTI_AB[1:0]. Controls the behavior
of the alpha-blend circuitry.
Reserved.
DNR_EN. Enable or bypass the DNR
block.
0x50
CTI DNR
Control 2
CTI DNR
Control 4
0
0
0
0
0
GDECOL[15:0]; 16
individual enable bits that
select the lines of video
(odd field Lines 10 to 25)
that the decoder checks
for Gemstar-compatible
data
x
x
0
Split data into half byte
1
Output in straight 8-bit
format
x
0
1
0
1
0
0
1
1
0
1
0
1
0
0
1
Reserved.
CTI_CTH[7:0]. Specifies how big the
amplitude step must be to be
steepened by the CTI block.
1 1
0 0
0
0
1
0
0
0
DNR_TH[7:0]. Specifies the
maximum edge that is interpreted
as noise and is therefore blanked.
0 0
0
0 1
0
0
0
O
0x4E
0
LE
0x4D
B
SO
0x49
Set to default
SFL compatible with
ADV7190/ADV7191/
ADV7194 encoders
SFL compatible with
ADV717x/ADV7173x
encoders
Set to default
GDECEL[15:0]; 16
individual enable bits that
select the lines of video
(even field Lines 10 to 25)
that the decoder checks
for Gemstar-compatible
data
Notes
LSB = Line 10;
MSB = Line 25.
Default = Do not
check for Gemstarcompatible data on
any lines[10 to 25]
in even fields.
LSB = Line 10;
MSB = Line 25.
Default = Do not
check for Gemstarcompatible data on
any lines[10 to 25]
in odd fields.
To avoid 00/FF
code.
TE
Gemstar
Control 1
Gemstar
Control 2
0x48
Comments
Rev. B | Page 82 of 100
Undefined
Disable CTI
Enable CTI
Disable CTI alpha blender
Enable CTI alpha blender
Sharpest mixing
Sharp mixing
Smooth
Smoothest
Set to default
Bypass the DNR block
Enable the DNR block
Set to default
Set to 0x04 for A/V input;
set to 0x0A for tuner input
ADV7181B
Register
Bit Description
0x51
Lock Count
CIL[2:0]. Count-into-lock determines
the number of lines the system must
remain in lock before showing a
locked status.
7 6
COL[2:0]. Count-out-of-lock
determines the number of lines the
system must remain out-of-lock
before showing a lost-locked status.
0
0
0
0
1
1
1
1
SRLS. Select raw lock signal. Selects
the determination of the locked
status.
0
1
0
Bits
4 3
0
0
1
1
0
0
1
1
2
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0x90
Free Run
Line
Length 1
Reserved.
LLC_PAD_SEL[2:0]. Enables manual
selection of clock for LLC1 pin.
0
0
0
0
1
0
1
B
SO
0x8F
VBI Info
(Read
Only)
Reserved.
WSSD. Screen signaling detected.
CCAPD. Closed caption data.
O
WSS1
0x92
WSS2
(Read Only)
0x93
EDTV1
(Read Only)
0x94
EDTV2
(Read Only)
0x95
EDTV3
(Read Only)
0x96
CGMS1
(Read Only)
0x97
CGMS2
(Read Only)
0x98
CGMS3
(Read Only)
0
0
0
1
0
1
0
1
CGMSD. CGMS sequence.
(Read Only)
0
0
EDTVD. EDTV sequence.
0x91
Comments
1 line of video
2 lines of video
5 lines of video
10 lines of video
100 lines of video
500 lines of video
1000 lines of video
100000 lines of video
1 line of video
2 lines of video
5 lines of video
10 lines of video
100 lines of video
500 lines of video
1000 lines of video
100000 lines of video
Over field with vertical
info
Line-to-line evaluation
Lock status set only by
horizontal lock
Lock status set by
horizontal lock and
subcarrier lock
Set to default
LLC1 (nominal 27 MHz)
selected out on LLC1 pin
LLC2 (nominally 13.5 MHz)
selected out on LLC1 pin
Set to default
No WSS detected
WSS detected
No CCAP signals detected
CCAP sequence detected
No EDTV sequence
detected
EDTV sequence detected
No CGMS transition
detected
CGMS sequence decoded
LE
FSCLE. Fsc lock enable.
5
Notes
TE
Subaddress
0
1
Reserved.
WSS1[7:0]
Wide screen signaling data.
x
x
x
x
x
x
x
x
x
x
x
x
WSS2[7:0]
Wide screen signaling data.
x x
x
x
x
x
x
x
EDTV1[7:0]
EDTV data register.
EDTV2[7:0]
EDTV data register.
EDTV3[7:0]
EDTV data register.
CGMS1[7:0]
CGMS data register.
CGMS2[7:0]
CGMS data register.
CGMS3[7:0]
CGMS data register.
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Rev. B | Page 83 of 100
For 16-bit 4:2:2 out,
OF_SEL[3:0] = 0010.
Read only status
bits.
WSS2[7:6] are
undetermined
EDTV3[7:6] are
undetermined
CGMS3[7:4] are
undetermined
EDTV3[5] is reserved
for future use.
ADV7181B
Subaddress
Register
Bit Description
0x99
CCAP1
0x9A
CCAP2
CCAP1[7:0]
Closed caption data register.
CCAP2[7:0]
Closed caption data register.
LB_LCT[7:0]
Letterbox data register.
0x9B
Letterbox 1
(Read Only)
0x9C
Letterbox 2
(Read Only)
LB_LCM[7:0]
Letterbox 3
(Read Only)
LB_LCB[7:0]
CRC Enable
Write
Register
Reserved.
0x9D
0xB2
1
x
0
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x x
x
x
x
x
x
x
x x
x
x
x
x
x
x
Letterbox data register.
0
CRC_ENABLE. Enable CRC checksum
decoded from CGMS packet to
validate CGMSD.
ADC0_SW[3:0]. Manual muxing
control for ADC0.
0 0
0
1
B
SO
ADC
SWITCH 1
2
x
Letterbox data register.
Reserved.
ADC1_SW[3:0]. Manual muxing
control for ADC1.
O
0xC3
Bits
4 3
x x
Comments
CCAP1[7] contains parity
bit for byte 0
CCAP2[7] contains parity
bit for byte 0
Reports the number of
black lines detected at the
top of active video
Reports the number of
black lines detected in the
bottom half of active video
if subtitles are detected
Reports the number of
black lines detected at the
bottom of active video.
Set as default
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Notes
This feature
examines the active
video at the start
and at the end of
each field. It enables
format detection
even if the video is
not accompanied
by a CGMS or WSS
sequence.
TE
(Read Only)
5
x
0
0
Turn off CRC check
1
CGMSD goes high with
valid checksum
Set as default
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
No connection
AIN2
No connection
No connection
AIN4
AIN6
No connection
No connection
No connection
AIN1
No connection
No connection
AIN3
AIN5
No connection
No connection
No connection
No connection
No connection
No connection
AIN4
AIN6
No connection
No connection
No connection
No connection
No connection
No connection
AIN3
AIN5
No connection
No connection
LE
(Read Only)
7 6
x x
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Rev. B | Page 84 of 100
SETADC_sw_
man_en = 1.
SETADC_sw_
man_en = 1.
ADV7181B
Register
Bit Description
0xC4
ADC
SWITCH 2
ADC2_SW[3:0]. Manual muxing
control for ADC2.
7 6
Reserved.
x
Letterbox
Control 1
0xDD
Letterbox
Control 2
0xDE
0xDF
0xE0
0xE1
0xE2
SD Offset
Cb
SD Offset
Cr
SD
Saturation
Cb
SD
Saturation
Cr
NTSC V Bit
Begin
0xE4
0xE5
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Comments
Notes
No connection
No connection
No connection
No connection
No connection
AIN6
No connection
No connection
No connection
No connection
No connection
No connection
No connection
AIN5
No connection
No connection
SETADC_sw_
man_en = 1.
Disable
Enable
Default threshold for the
detection of black lines
Set as default
LB detection ends with
the last line of active video
on a field.;1100b: 262/525
Letterbox detection
aligned with the start of
active video; 0100b:
23/286 NTSC
0
1 0
0 1
1
1
0
0
1
1
0
0
1
0
0
Reserved.
0 0
0
0
0
0
0
0
Reserved.
0 0
0
0
0
0
0
0
Reserved.
0 0
0
1
0
1
0
0
SD_OFF_CB[7:0]. Adjusts the hue by
selecting the offset for the Cb
channel.
SD_OFF_CR[7:0]. Adjusts the hue by
selecting the offset for the Cr
channel.
SD_SAT_CB[7:0]. Adjusts the
saturation of the picture by
affecting gain on the Cb channel.
SD_SAT_CR[7:0]. Adjusts the
saturation of the picture by
affecting gain on the Cr channel.
NVBEG[4:0]. How many lines after
lCOUNT rollover to set V high.
NVBEGSIGN.
1 0
0
0
0
0
0
0
1 0
0
0
0
0
0
0
1 0
0
0
0
0
0
0
Chroma gain = 0 dB
1 0
0
0
0
0
0
0
Chroma gain = 0 dB
0
0
1
0
1
NTSC default (BT.656)
O
0xE3
LB_TH[4:0]. Sets the threshold value
that determines if a line is black.
Reserved.
LB_EL[3:0]. Programs the end line of
the activity window for LB detection
(end of field).
LB_SL[3:0]. Program the start line of
the activity window for LB detection
(start of field).
B
SO
0xDC
x
0
1
Bits
4 3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
x
LE
ADC_SW_MAN_EN. Enable manual
setting of the input signal muxing.
5
TE
Subaddress
0
1
NVBEGDELE. Delay V bit going high
by one line relative to NVBEG (even
field).
NVBEGDELO. Delay V bit going high
by one line relative to NVBEG (odd
field).
0
1
0
1
Rev. B | Page 85 of 100
Set to low when manual
programming
Not suitable for user
programming
No delay
Additional delay by 1 line
No delay
Additional delay by 1 line
ADV7181B
Subaddress
Register
Bit Description
0xE6
NTSC V Bit
End
NVEND[4:0]. How many lines after
lCOUNT rollover to set V low.
NVENDSIGN.
7 6
5
Bits
4 3
0 0
2
1
1
0
0
0
0
NTSC F Bit
Toggle
0
1
0
1
No delay
Additional delay by 1 line
0
0
PAL V Bit
Begin
1
1
0
1
0
1
No delay
Additional delay by 1 line
0
0
1
0
1
0
B
SO
PAL V Bit
End
PVBEGDELE. Delay V bit going high
by one line relative to PVBEG (even
field).
PVBEGDELO. Delay V bit going high
by one line relative to PVBEG (odd
field).
PVEND[4:0]. How many lines after
lCOUNT rollover to set V low.
PVENDSIGN.
0
1
0
1
1
No delay
Additional delay by 1 line
0
1
0
0
0
O
0xEA
PAL F Bit
Toggle
0
1
0
1
No delay
Additional delay by 1 line
0
0
0
1
PFTOGDELE. Delay F transition by
one line relative to PFTOG (even
field).
PFTOGDELO. Delay F transition by
one line relative to PFTOG (odd
field).
PAL default (BT.656)
Set to low when manual
programming
Not suitable for user
programming
No delay
Additional delay by 1 line
1
PVENDDELE. Delay V bit going low
by one line relative to PVEND (even
field).
PVENDDELO. Delay V bit going low
by one line relative to PVEND (odd
field).
PFTOG[4:0]. How many lines after
lCOUNT rollover to toggle F signal.
PFTOGSIGN.
PAL default (BT.656)
Set to low when manual
programming
Not suitable for user
programming
No delay
Additional delay by 1 line
1
0xE9
NTSC default
LE
0xE8
0
Set to low when manual
programming
Not suitable for user
programming
No delay
Additional delay by 1 line
1
NFTOGDELE. Delay F transition by
one line relative to NFTOG (even
field).
NFTOGDELO. Delay F transition by
one line relative to NFTOG (odd
field).
PVBEG[4:0]. How many lines after
lCOUNT rollover to set V high.
PVBEGSIGN.
0
TE
0xE7
Notes
NTSC default (BT.656)
Set to low when manual
programming
Not suitable for user
programming
No delay
Additional delay by 1 line
1
NVENDDELE. Delay V bit going low
by one line relative to NVEND (even
field).
NVENDDELO. Delay V bit going low
by one line relative to NVEND (odd
field).
NFTOG[4:0]. How many lines after
lCOUNT rollover to toggle F signal.
NFTOGSIGN.
Comments
0
1
0
1
Rev. B | Page 86 of 100
0
1
1
PAL default (BT.656)
Set to low when manual
programming
Not suitable for user
programming
No delay
Additional delay by 1 line
No delay
Additional delay by 1 line
ADV7181B
Subaddress
Register
Bit Description
0xF4
Drive
Strength
DR_STR_S[1:0]. Select the drive
strength for the Sync output signals.
7 6
5
Bits
4 3
DR_STR_C[1:0]. Select the drive
strength for the Clock output signal.
0
0
1
1
0xF9
x
VS Mode
Control
0
1
1
0
1
1
0
0
1
1
0
1
1
0
1
Comments
Notes
Low drive strength (1x)
Medium-low drive
strength (2x)
Medium-high drive
strength (3x)
High drive strength (4x)
Low drive strength (1x)
Medium-low drive
strength (2x)
Medium-high drive
strength (3x)
High drive strength (4x)
Low drive strength (1x)
Medium-low drive
strength (2x)
Medium-high drive
strength (3x)
High drive strength (4x)
No delay
Bypass mode
2 MHz
5 MHz
0
1
0
0
0
0 dB.
NTSC filters.
LE
IF Comp
Control
x
B
SO
0xF8
Reserved.
IFFILTSEL[2:0]. IF filter selection for
Pal and NTSC.
0
0
1
0
0
TE
DR_STR[1:0]. Select the drive
strength for the data output signals.
Can be increased or decreased for
EMC or crosstalk reasons.
2
Reserved.
EXTEND_VS_MAX_FREQ.
0 0
0
0
0
0
1
−3 dB
−2 dB
0
1
0
−6 dB
+3.5 dB
0
1
1
+5 dB
1
0
0
−10 dB
Reserved
3 MHz
1
0
1
−2 dB
6 MHz
+2 dB
1
1
0
−5 dB
+3 dB
1
1
1
−7 dB
+5 dB
0
Limit maximum Vsync
frequency to 66.25 Hz
(475 lines/frame)
Limit maximum Vsync
frequency to 70.09 Hz
(449 lines/frame)
Limit minimum Vsync
frequency to 42.75 Hz
(731 lines/frame)
Limit minimum Vsync
frequency to 39.51 Hz
(791 lines/frame)
Auto coast mode
50 Hz coast mode
60 Hz coast mode
Reserved
0
1
EXTEND_VS_MIN_FREQ.
0
O
1
VS_COAST_MODE[1:0].
Reserved.
0
0
1
1
0 0
0
PAL filters.
0
Rev. B | Page 87 of 100
0
1
0
1
This value sets up
the output coast
frequency.
ADV7181B
I2C PROGRAMMING EXAMPLES
EXAMPLES FOR 28 MHz CLOCK
Mode 1 CVBS Input (Composite Video on AIN6)
All standards are supported through autodetect, 8-bit, 4:2:2, ITU-R BT.656 output on P15 to P8.
Table 86. Mode 1 CVBS Input
0x20
0x18
0xED
0xC5
0x93
0x00
0xC9
0x40
0x3C
0xCA
0xD5
0x50
0x4E
0xDD
0x51
0xA0
0xEA
0x3E
0x0F
0x3E
0x00
TE
0x50
0x52
0x58
0x77
0x7C
0x7D
0x90
0x91
0x92
0x93
0x94
0xCF
0xD0
0xD6
0xE5
0xD5
0xD7
0xE4
0xEA
0xE9
0x0E
Notes
Slow down digital clamps.
Set CSFM to SH1.
Enable 28 MHz crystal.
TRAQ.
Power down ADC 1 and ADC 2.
MWE enable manual window.
BGB to 36.
Set DNR threshold.
Man mux AIN6 to ADC0 (0101).
Enable manual muxing.
ADI recommended programming sequence. This sequence must be followed exactly when setting
up the decoder.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
LE
Register Value
0x00
0x41
0x40
0x40
0x16
0xC3
0xE4
0x04
0x05
0x80
0x80
O
B
SO
Register Address
0x15
0x17
0x1D
0x0F
0x3A
0x3D
0x3F
0x50
0xC3
0xC4
0x0E
Rev. B | Page 88 of 100
ADV7181B
Mode 2 S-Video Input (Y on AIN1 and C on AIN4)
All standards are supported through autodetect, 8-bit, ITU-R BT.656 output on P15 to P8.
Table 87. Mode 2 S-Video Input
0x20
0x18
0xED
0xC5
0x93
0x00
0xC9
0x40
0x3C
0xCA
0xD5
0x50
0x4E
0xDD
0x51
0xA0
0xEA
0x3E
0xE3
0x0F
0x00
TE
0x50
0x52
0x58
0x77
0x7C
0x7D
0x90
0x91
0x92
0x93
0x94
0xCF
0xD0
0xD6
0xE5
0xD5
0xD7
0xE4
0xE9
0xEA
0x0E
Notes
S-Video input.
Slow down digital clamps.
Enable 28 MHz crystal.
TRAQ.
Power down ADC 2.
MWE enable manual window.
BGB to 36.
Set DNR threshold.
Manual mux AIN2 to ADC0 (0001), AIN4 to ADC1 (0100).
Enable manual muxing.
ADI recommended programming sequence. This sequence must be followed exactly when
setting up the decoder.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
LE
Register Value
0x06
0x00
0x40
0x40
0x12
0xC3
0xE4
0x04
0x41
0x80
0x80
O
B
SO
Register Address
0x00
0x15
0x1D
0x0F
0x3A
0x3D
0x3F
0x50
0xC3
0xC4
0x0E
Rev. B | Page 89 of 100
ADV7181B
Mode 3 525i/625i YPrPb Input (Y on AIN1, Pr on AIN3, and Pb on AIN5)
All standards are supported through autodetect, 8-bit, ITU-R BT.656 output on P15 to P8.
Table 88. Mode 3 YPrPb Input 525i/625i
0x18
0xED
0xC5
0x93
0x00
0xC9
0x40
0x3C
0xCA
0xD5
0x50
0x4E
0xDD
0x51
0xA0
0x3E
0x3E
0x00
TE
0x52
0x58
0x77
0x7C
0x7D
0x90
0x91
0x92
0x93
0x94
0xCF
0xD0
0xD6
0xE5
0xD5
0xE4
0xE9
0x0E
Notes
YPrPb input.
Enable 28 MHz crystal.
TRAQ.
MWE enable manual window.
BGB to 36.
Set DNR threshold.
Manual mux AIN1 to ADC0 (1001), AIN3 to ADC1 (1100).
Enable manual muxing, Man mux AIN5 to ADC2 (1101).
ADI recommended programming sequence. This sequence must be followed exactly when
setting up the decoder.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
LE
Register Value
0x0A
0x40
0x40
0xC3
0xE4
0x04
0xC9
0x8D
0x80
O
B
SO
Register Address
0x00
0x1D
0x0F
0x3D
0x3F
0x50
0xC3
0xC4
0x0E
Rev. B | Page 90 of 100
ADV7181B
Mode 4 CVBS Tuner Input CVBS PAL on AIN6
All standards are supported through autodetect, 8-bit, ITU-R BT.656 output on P15 to P8.
Table 89. Mode 4 Tuner Input CVBS PAL Only
0x20
0x18
0xED
0xC5
0x93
0x00
0xC9
0x40
0x3C
0xCA
0xD5
0x50
0x4E
0xDD
0x51
0xA0
0xEA
0x3E
0x3E
0x0F
0x00
TE
0x50
0x52
0x58
0x77
0x7C
0x7D
0x90
0x91
0x92
0x93
0x94
0xCF
0xD0
0xD6
0xE5
0xD5
0xD7
0xE4
0xE9
0xEA
0x0E
Notes
Force PAL input only mode.
Enable PAL autodetection only.
Slow down digital clamps.
Set CSFM to SH1.
Stronger dot crawl reduction.
Enable 28 MHz crystal.
TRAQ.
Power down ADC 1 and ADC 2.
MWE enable manual window.
BGB to 36.
Set higher DNR threshold.
Manual mux AIN6 to ADC0 (0101).
Enable manual muxing.
ADI recommended programming sequence. This sequence must be followed exactly when
setting up the decoder.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
LE
Register Value
0x80
0x01
0x00
0x41
0xFA
0x40
0x40
0x16
0xC3
0xE4
0x0A
0x05
0x80
0x80
O
B
SO
Register Address
0x00
0x07
0x15
0x17
0x19
0x1D
0x0F
0x3A
0x3D
0x3F
0x50
0xC3
0xC4
0x0E
Rev. B | Page 91 of 100
ADV7181B
EXAMPLES FOR 27 MHz CLOCK
Mode 1 CVBS Input (Composite Video on AIN6)
All standards are supported through autodetect, 8-bit, 4:2:2, ITU-R BT.656 output on P15 to P8.
Table 90. Mode 1 CVBS Input
0x20
0x18
0xED
0xC5
0x93
0x00
0x48
0xA0
0xEA
0x3E
0x0F
0x3E
0x00
TE
0x50
0x52
0x58
0x77
0x7C
0x7D
0xD0
0xD5
0xD7
0xE4
0xEA
0xE9
0x0E
Notes
Slow down digital clamps.
Set CSFM to SH1.
Power down ADC 1 and ADC 2.
Set DNR threshold.
Manual mux AIN6 to ADC0 (0101).
Enable manual muxing.
ADI recommended programming sequence. This sequence must be followed exactly when
setting up the decoder.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting
Recommended setting.
LE
Register Value
0x00
0x41
0x16
0x04
0x05
0x80
0x80
B
SO
Register Address
0x15
0x17
0x3A
0x50
0xC3
0xC4
0x0E
Mode 2 S-Video Input (Y on AIN1 and C on AIN4)
All standards are supported through autodetect, 8-bit, ITU-R BT.656 output on P15 to P8.
Table 91. Mode 2 S-Video Input
0x50
0x52
0x58
0x77
0x7C
0x7D
0xD0
0xD5
0xD7
0xE4
0xE9
0xEA
0x0E
Register Value
0x06
0x00
0x12
0x04
0x41
0x80
0x80
O
Register Address
0x00
0x15
0x3A
0x50
0xC3
0xC4
0x0E
0x20
0x18
0xED
0xC5
0x93
0x00
0x48
0xA0
0xEA
0x3E
0xE3
0x0F
0x00
Notes
S-Video input.
Slow down digital clamps.
Power down ADC 2.
Set DNR threshold.
Manual mux AIN2 to ADC0 (0001), AIN4 to ADC1 (0100).
Enable manual muxing.
ADI recommended programming sequence. This sequence must be followed exactly when
setting up the decoder.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting
Recommended setting.
Recommended setting.
Rev. B | Page 92 of 100
ADV7181B
Mode 3 525i/625i YPrPb Input (Y on AIN1, Pr on AIN3, and Pb on AIN5)
All standards are supported through autodetect, 8-bit, ITU-R BT.656 output on P15 to P8.
Table 92. Mode 3 YPrPb Input 525i/625i
0x18
0xED
0xC5
0x93
0x00
0x48
0xA0
0x3E
0x3E
0x00
TE
0x52
0x58
0x77
0x7C
0x7D
0xD0
0xD5
0xE4
0xE9
0x0E
Notes
YPrPb Input.
Set DNR threshold.
Manual mux AIN1 to ADC0 (1001), AIN3 to ADC1 (1100).
Enable manual muxing, manual mux AIN5 to ADC2 (1101).
ADI recommended programming sequence. This sequence must be followed exactly when
setting up the decoder.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting
Recommended setting.
LE
Register Value
0x0A
0x04
0xC9
0x8D
0x80
O
B
SO
Register Address
0x00
0x50
0xC3
0xC4
0x0E
Rev. B | Page 93 of 100
ADV7181B
Mode 4 CVBS Tuner Input CVBS PAL on AIN6
All standards are supported through autodetect, 8-bit, ITU-R BT.656 output on P15 to P8.
Table 92. Mode 4 Tuner Input CVBS PAL Only
0x20
0x18
0xED
0xC5
0x93
0x00
0x48
0xA0
0xEA
0x3E
0x3E
0x0F
0x00
TE
0x50
0x52
0x58
0x77
0x7C
0x7D
0xD0
0xD5
0xD7
0xE4
0xE9
0xEA
0x0E
Notes
Force PAL input only mode.
Enable PAL autodetection only.
Slow down digital clamps.
Set CSFM to SH1.
Stronger dot crawl reduction.
Power down ADC 1 and ADC 2.
Set higher DNR threshold.
Manual mux AIN6 to ADC0 (0101).
Enable manual muxing.
ADI recommended programming sequence. This sequence must be followed exactly when
setting up the decoder.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting.
Recommended setting
Recommended setting.
Recommended setting.
LE
Register Value
0x80
0x01
0x00
0x41
0xFA
0x16
0x0A
0x05
0x80
0x80
O
B
SO
Register Address
0x00
0x07
0x15
0x17
0x19
0x3A
0x50
0xC3
0xC4
0x0E
Rev. B | Page 94 of 100
ADV7181B
PCB LAYOUT RECOMMENDATIONS
It is also recommended to use a single ground plane for the
entire board. This ground plane should have a space between
the analog and digital sections of the PCB (see Figure 41).
ADV7181B
ANALOG INTERFACE INPUTS
ANALOG
SECTION
POWER SUPPLY DECOUPLING
Experience has repeatedly shown that the noise performance is
the same or better with a single ground plane. Using multiple
ground planes can be detrimental because each separate ground
plane is smaller and long ground loops can result.
In some cases, using separate ground planes is unavoidable. For
those cases, it is recommended to place a single ground plane
under the ADV7181B. The location of the split should be under
the ADV7181B. For this case, it is even more important to place
components wisely because the current loops are much longer
(current takes the path of least resistance). An example of a
current loop: power plane to ADV7181B to digital output trace
to digital data receiver to digital ground plane to analog ground
plane.
B
SO
LE
It is recommended to decouple each power supply pin with
0.1 μF and 10 nF capacitors. The fundamental idea is to have a
decoupling capacitor within about 0.5 cm of each power pin.
Also, avoid placing the capacitor on the opposite side of the PC
board from the ADV7181B, as doing so interposes resistive vias
in the path. The decoupling capacitors should be located
between the power plane and the power pin. Current should
flow from the power plane to the capacitor to the power pin. Do
not make the power connection between the capacitor and the
power pin. Placing a via underneath the 100 nF capacitor pads,
down to the power plane, is generally the best approach (see
Figure 40).
Figure 41. PCB Ground Layout
TE
Care should be taken when routing the inputs on the PCB.
Track lengths should be kept to a minimum, and 75 Ω trace
impedances should be used when possible. Trace impedances
other than 75 Ω also increase the chance of reflections.
DIGITAL
SECTION
04984-041
The ADV7181B is a high precision, high speed mixed-signal
device. To achieve the maximum performance from the part, it
is important to have a PCB board with a good layout. The
following is a guide for designing a board using the ADV7181B.
VDD
VIA TO SUPPLY
10nF
100nF
VIA TO GND
04984-040
GND
Figure 40. Recommended Power Supply Decoupling
O
It is particularly important to maintain low noise and good
stability of PVDD. Careful attention must be paid to regulation,
filtering, and decoupling. It is highly desirable to provide
separate regulated supplies for each of the analog circuitry
groups (AVDD, DVDD, DVDDIO, and PVDD).
Some graphic controllers use substantially different levels of
power when active (during active picture time) and when idle
(during horizontal and vertical sync periods). This can result in
a measurable change in the voltage supplied to the analog
supply regulator, which can, in turn, produce changes in the
regulated analog supply voltage. This can be mitigated by
regulating the analog supply, or at least PVDD, from a different,
cleaner power source, for example, from a 12 V supply.
PLL
Place the PLL loop filter components as close as possible to the
ELPF pin. Do not place any digital or other high frequency
traces near these components. Use the values suggested in the
data sheet with tolerances of 10% or less.
DIGITAL OUTPUTS (BOTH DATA AND CLOCKS)
Try to minimize the trace length the digital outputs have to
drive. Longer traces have higher capacitance, which requires
more current, which causes more internal digital noise. Shorter
traces reduce the possibility of reflections.
Adding a 30 Ω to 50 Ω series resistor can suppress reflections,
reduce EMI, and reduce the current spikes inside the ADV7181B.
If series resistors are used, place them as close as possible to the
ADV7181B pins. However, try not to add vias or extra length to
the output trace to make the resistors closer.
If possible, limit the capacitance that each of the digital outputs
drives to less than 15 pF. This can easily be accomplished by
keeping traces short and by connecting the outputs to only one
device. Loading the outputs with excessive capacitance increases
the current transients inside the ADV7181B, creating more
digital noise on its power supplies.
Rev. B | Page 95 of 100
ADV7181B
DIGITAL INPUTS
CRYSTAL LOAD CAPACITOR VALUE SELECTION
The digital inputs on the ADV7181B are designed to work with
3.3 V signals, and are not tolerant of 5 V signals. Extra components are needed if 5 V logic signals are required to be applied
to the decoder.
Figure 43 shows an example reference clock circuit for the a
ADV7181B. Special care must be taken when using a crystal
circuit to generate the reference clock for the ADV7181B. Small
variations in reference clock frequency can cause autodetection
issues and impair the ADV7181B performance.
The load capacitance given in a crystal data sheet specifies the
parallel resonance frequency within the tolerance at 25°C. It is
therefore important to design a circuit that matches the load
capacitance in order to achieve the frequency stipulated by the
manufacturer. For detailed crystal circuit design and optimization, an applications note on crystal design considerations is
available for reference.
XTAL
XTAL 1
R = 1MΩ
C1
47pF
XTAL
28.63636MHz
LE
The buffer is a simple emitter-follower using a single npn
transistor. The antialiasing filter is implemented using passive
components. The passive filter is a third-order Butterworth
filter with a −3 dB point of 9 MHz. The frequency response of
the passive filter is shown in Figure 42. The flat pass band up to
6 MHz is essential. The attenuation of the signal at the output of
the filter due to the voltage divider of R24 and R63 is compensated for in the ADV7181B part using the automatic gain control.
Load capacitor values are dependant on crystal attributes.
Figure 43. Crystal Circuit
Use the following guidelines to ensure correct operation:
•
B
SO
The ac-coupling capacitor at the input to the buffer creates a
high-pass filter with the biasing resistors for the transistor. This
filter has a cut-off of
–1
{2 × π × (R39||R89) × C93} = 0.62 Hz
It is essential the cutoff of this filter be less than 1 Hz to ensure
correct operation of the internal clamps within the part. These
clamps ensure the video stays within the 5 V range of the
op amp used.
Use the correct frequency crystal, which is 28.63636 MHz.
Tolerance should be 50 ppm or better.
•
Use a parallel-resonant crystal.
•
Place a 1 MΩ shunt resistor across pins XTAL1 and
XTAL2 as is shown in Figure 43.
•
Know the CLOAD for the crystal part number selected. The
value of Capacitors C1 and C2 must match CLOAD for the
specific crystal part number in the user’s system.
To determine CLOAD, use the following guideline:
C1 = C2 = C
C = 2 ( CLOAD – Cs ) - Cpg
0
O
–20
where:
Cpg is the pin-to-ground capacitance; approximately
4 pF to 10 pF.
CS is the PCB stray capacitance, approximately
2 pF to-3 pF.
–40
–60
–80
For example,
CLOAD = 30 pF
C = 2 ( 30-3 ) − 4
= 50 pF
Therefore, two 47 pF capacitors can be chosen for
C1 and C2.
300k
1M
3M
10M
30M
FREQUENCY (Hz)
100M
300M
1G
04984-042
–100
–120
100k
C2
47pF
04984-046
For inputs from some video sources that are not bandwidth
limited, signals outside the video band can alias back into the
video band during A/D conversion and appear as noise on the
output video. The ADV7181B oversamples the analog inputs by
a factor of 4. This 54 MHz sampling frequency reduces the
requirement for an input filter; for optimal performance it is
recommended an antialiasing filter be used. The recommended
low-cost circuit for implementing this buffer and filter circuit
for all analog input signals is shown in Figure 44.
TE
ANTIALIASING FILTERS
Figure 42. Third-Order Butterworth Filter Response
Rev. B | Page 96 of 100
ADV7181B
TYPICAL CIRCUIT CONNECTION
Examples of how to connect the ADV7181B video decoder are shown in Figure 44 and Figure 45. For a detailed schematic diagram for
the ADV7181B, refer to the ADV7181B evaluation note.
AVDD_5V
BUFFER
R38
75Ω
R53
56Ω
R89
5.6kΩ
C
B
Q6
E
R24
470Ω
AGND
FILTER
L10
12μH
C95
22pF
C102
10pF
R63
820Ω
04984-043
R39
4.7kΩ
TE
C93
100μF
R43
0Ω
O
B
SO
LE
Figure 44. ADI Recommended Antialiasing Circuit for All Input Channels
Rev. B | Page 97 of 100
ADV7181B
FERRITE BEAD
DVDDIO
(3.3V)
33μF
PVDD
(1.8V)
33μF
0.1μF
AGND
10μF
0.1μF
AIN1
ANTI-ALIAS
FILTER CIRCUIT
100nF
AIN3
ANTI-ALIAS
FILTER CIRCUIT
100nF
ANTI-ALIAS
FILTER CIRCUIT
100nF
ADV7181B
AIN4
ANTI-ALIAS
FILTER CIRCUIT
0.01μF POWER SUPPLY
DECOUPLING FOR
EACH POWER PIN
AGND
0.01μF POWER SUPPLY
DECOUPLING FOR
EACH POWER PIN
AGND
0.01μF POWER SUPPLY
DECOUPLING FOR
EACH POWER PIN
DGND
P0
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P13
P14
P15
MULTI-FORMAT
PIXEL PORT
P15–P8 8-BIT ITU-R BT.656 PIXEL DATA @ 27MHz
P7–P0 Cb AND Cr 16-BIT ITU-R BT.656 PIXEL DATA @ 13.5MHz
P15–P8 Y1 AND Y2 16-BIT ITU-R BT.656 PIXEL DATA @ 13.5MHz
LE
AIN5
0.01μF POWER SUPPLY
DECOUPLING FOR
EACH POWER PIN
DGND
TE
100nF
DVDDIO
AVDD
AIN2
DGND
PVDD
DGND
100nF
DVDD
DGND
ANTI-ALIAS
FILTER CIRCUIT
CBVS
AGND
10μF
33μF
ANTI-ALIAS
FILTER CIRCUIT
Pb
0.1μF
AGND
AGND
FERRITE BEAD
AGND DGND
Pr
DGND
10μF
33μF
DVDD
(1.8V)
Y
0.1μF
AGND
AGND
FERRITE BEAD
AVDD
(3.3V)
S-VIDEO
10μF
DGND
DGND
FERRITE BEAD
100nF
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
AIN6
RECOMMENDED ANTI-ALIAS FILTER
CIRCUIT IS SHOWN IN FIGURE 44 ON THE
PREVIOUS PAGE. THIS CIRCUIT INCLUDES
A 75Ω TERMINATION RESISTOR, INPUT
BUFFER AND ANTI-ALIASING FILTER.
AGND
0.1μF
CAPY1
+
10μF
0.1μF
0.1nF
27MHz OUTPUT CLOCK
LLC
B
SO
CAPY2
0.1μF
AGND
+
10μF
0.1μF
0.1nF
CAPC2
AGND
CML
+
10μF
0.1μF
REFOUT
+
10μF
0.1μF
AGND
CAPACITOR VALUES
47pF
ARE DEPENDENT
ON XTAL ATTRIBUTES.
DGND
DVDDIO
XTAL
1MΩ
INTERRUPT O/P
INTRQ
SFL
28.63636MHz
XTAL1
SFL O/P
HS
HS O/P
VS
VS O/P
FIELD
FIELD O/P
47pF
DVDDIO
O
DGND
SELECT I2C
ADDRESS
DVDDIO
2kΩ
ELPF
DVDDIO
1.69kΩ
2kΩ
10nF
82nF
33Ω
SCLK
MPU INTERFACE
CONTROL LINES
33Ω
PVDD
SDA
DVDDIO
4.7kΩ
RESET
RESET
AGND
DGND
AGND
DGND
100nF
DGND
Figure 45. Typical Connection Diagram
Rev. B | Page 98 of 100
04984-044
DVSS
PWRDN
ALSB
ADV7181B
OUTLINE DIMENSIONS
9.00
BSC SQ
0.30
0.25
0.18
0.60 MAX
0.60 MAX
49
48
PIN 1
INDICATOR
8.75
BSC SQ
TOP
VIEW
PIN 1
INDICATOR
64
1
*7.25
7.10 SQ
6.95
EXPOSED PAD
(BOTTOM VIEW)
0.45
0.40
0.35
33
32
17
16
0.25 MIN
0.80 MAX
0.65 TYP
12° MAX
THE EXPOSED METAL PADDLE ON THE
BOTTOM OF THE LFCSP PACKAGE MUST
BE SOLDERED TO PCB GROUND FOR PROPER
HEAT DISSIPATION AND ALSO FOR NOISE
AND MECHANICAL STRENGTH BENEFITS.
TE
1.00
0.85
0.80
7.50
REF
0.05 MAX
0.02 NOM
0.50 BSC
SEATING
PLANE
0.20 REF
*COMPLIANT TO JEDEC STANDARDS MO-220-VMMD
EXCEPT FOR EXPOSED PAD DIMENSION
LE
Figure 46. 64-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
9 × 9 mm Body, Very Thin Quad (CP-64-3)
Dimensions shown in millimeters
0.75
0.60
0.45
12.00
BSC SQ
1.60
MAX
64
49
1
48
B
SO
PIN 1
1.45
1.40
1.35
0.15
0.05
SEATING
PLANE
VIEW A
0.20
0.09
7°
3.5°
0°
0.08 MAX
COPLANARITY
16
VIEW A
33
32
17
0.50
BSC
LEAD PITCH
ROTATED 90° CCW
COMPLIANT TO JEDEC STANDARDS MS-026-BCD
O
10.00
BSC SQ
TOP VIEW
(PINS DOWN)
Figure 47. 64-Lead Low Profile Quad Flat Package [LQFP]
(ST-64-2)
Dimensions shown in millimeters
Rev. B | Page 99 of 100
0.27
0.22
0.17
ADV7181B
ORDERING GUIDE
Model 1
ADV7181BBCPZ 2
ADV7181BBSTZ2
EVAL-ADV7181BEB
Temperature Range
–40°C to +85°C
–40°C to +85°C
Package Description
Lead Frame Chip Scale Package (LFCSP_VQ)
Low Profile Quad Flat Package (LQFP)
Evaluation Board
Package Option
CP-64-3
ST-64-2
1
The ADV7181B is a Pb-free, environmentally friendly product. It is manufactured using the most up-to-date materials and processes. The coating on the leads of each
device is 100% pure Sn electroplate. The device is suitable for Pb-free applications and can withstand surface-mount soldering at up to 255°C (±5°C). In addition, it is
backward-compatible with conventional SnPb soldering processes. This means the electroplated Sn coating can be soldered with Sn/Pb solder pastes at conventional
reflow temperatures of 220°C to 235°C.
2
Z = Pb-free part.
O
B
SO
LE
TE
Purchase of licensed I2C components of Analog Devices or one of its sublicensed AssociatedCompanies conveys a license for the purchaser under the Philips I2C Patent
Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips.
© 2005 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D04984–0–9/05(B)
Rev. B | Page 100 of 100