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PDF GS4911B Data sheet ( Hoja de datos )

Número de pieza GS4911B
Descripción HD/SD/Graphics Clock and Timing Generator
Fabricantes Gennum 
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GS4911B/GS4910B HD/SD/Graphics Clock and Timing Generator with GENLOCK
Key Features
Video Clock Synthesis
• Generates any video or graphics clock up to 165MHz
• Pre-programmed for 8 video and 13 graphics clocks
• Accuracy of free-running clock frequency limited only by
crystal reference
• One differential and two single-ended video/graphics clock
outputs
• Each clock may be individually delayed for skew control
• Video output clock may be directly connected to Gennum’s
serializers for a SMPTE-compliant HD-SDI output
Audio Clock Synthesis (GS4911B only)
• Three audio clock outputs
• Generates any audio clock up to 512*96kHz
• Pre-programmed for 7 audio clocks
Timing Generation
• Generates up to 8 timing signals at a time
• Choose from 9 pre-programmed timing signals: H and V sync
and blanking, F Sync, F Digital, AFS (GS4911B only), Display
Enable, 10FID, and up to 4 user-defined timing signals
• Pre-programmed to generate timing for 35 different video
formats and 13 different graphic display formats
Genlock Capability
• Clocks may be free-running or genlocked to an input
reference with a variable offset step size of 100-200ps
(depending on exact clock frequency)
• Variable timing offset step size of 100-200ps up to one frame
• Output may be cross-locked to a different input reference
• Freeze operation on loss of reference
• Optional crash or drift lock on application of reference
• Automatic input format detection
General Features
• Reduces design complexity and saves board space - 9mm x
9mm package plus crystal reference replaces multiple
VCXOs, PLLs and timing generators
• Pb-free and RoHS Compliant
• Low power operation typically 300mW
• 1.8V core and 1.8V or 3.3V I/O power supplies
• 64-PIN QFN package
Description
The GS4911B is a highly flexible, digitally controlled clock
synthesis circuit and timing generator with genlock capability. It
can be used to generate video and audio clocks and timing signals,
and allows multiple devices to be genlocked to an input reference.
The GS4910B includes all the features of the GS4911B, but does
not offer audio clocks or AFS pulse generation.
The GS4911B/GS4910B will recognize input reference signals
conforming to 36 different video standards and 16 different
graphic formats, and will genlock the output timing information to
the incoming reference. The GS4911B/GS4910B supports
cross-locking, allowing the output to be genlocked to an incoming
reference that is different from the output video standard
selected.
The user may select to output one of 8 different video sample
clock rates or 13 different graphic display clock rates, or may
program any clock frequency between 13.5MHz and 165MHz.
The chosen clock frequency can be further divided using internal
dividers, and is available on two video clock outputs and one
LVDS video clock output pair. The video clocks are frequency and
phased-locked to the horizontal timing reference, and can be
individually delayed with respect to the timing outputs for clock
skew control.
Eight user-selectable timing outputs are provided that can
automatically produce the following timing signals for 35
different video formats and 13 different graphics formats: HSync,
Hblanking, VSync, Vblanking, F sync, F digital, AFS (GS4911B
only), DE, and 10FID. These timing outputs may be locked to the
input reference signal for genlock timing and may be phase
adjusted via internal registers.
In addition, the GS4911B provides three audio sample clock
outputs that can produce audio clocks up to 512fs with fs ranging
from 9.7kHz to 96kHz. Audio to video phasing is accomplished by
an external 10FID input reference, a 10FID signal specified via
internal registers, or a user-programmed audio frame sequence.
The GS4911B/GS4910B is Pb-free, and the encapsulation
compound does not contain halogenated flame retardant (RoHS
Compliant).
Applications
• Video cameras; Digital audio and/or video recording/play
back devices; Digital audio and/or video processing devices;
Computer/video displays; DVD/MPEG devices; Digital Set
top boxes; Video projectors; High definition video systems;
Multi-media PC applications
GS4911B/GS4910B HD/SD/Graphics Clock and Timing
Generator with GENLOCK
Data Sheet
36655 - 5
June 2009
www.gennum.com
1 of 119

1 page




GS4911B pdf
Contents
Key Features ........................................................................................................................................................1
Applications ......................................................................................................................................................... 1
Description ........................................................................................................................................................... 1
Revision History .................................................................................................................................................4
1. Pin Out...............................................................................................................................................................8
1.1 GS4911B Pin Assignment ...............................................................................................................8
1.2 GS4910B Pin Assignment ...............................................................................................................9
1.3 Pin Descriptions ............................................................................................................................. 10
1.4 Pre-Programmed Recognized Video and Graphics Standards ...................................... 20
1.5 Output Timing Signals ................................................................................................................. 26
2. Electrical Characteristics ......................................................................................................................... 30
2.1 Absolute Maximum Ratings ....................................................................................................... 30
2.2 DC Electrical Characteristics ..................................................................................................... 30
2.3 AC Electrical Characteristics ..................................................................................................... 33
3. Detailed Description.................................................................................................................................. 37
3.1 Functional Overview .................................................................................................................... 37
3.2 Modes of Operation ...................................................................................................................... 37
3.2.1 Genlock Mode..................................................................................................................... 38
3.2.2 Free Run Mode ................................................................................................................... 41
3.3 Output Timing Format Selection .............................................................................................. 42
3.4 Input Reference Signals ............................................................................................................... 43
3.4.1 HSYNC, VSYNC, and FSYNC.......................................................................................... 43
3.4.2 10FID ..................................................................................................................................... 44
3.4.3 Automatic Polarity Recognition ................................................................................... 45
3.5 Reference Format Detector ........................................................................................................ 45
3.5.1 Horizontal and Vertical Timing Characteristic Measurements ......................... 45
3.5.2 Input Reference Validity................................................................................................. 46
3.5.3 Behaviour on Loss and Re-acquisition of the Reference Signal......................... 47
3.5.4 Allowable Frequency Drift on the Reference .......................................................... 49
3.6 Genlock ............................................................................................................................................. 50
3.6.1 Automatic Locking Process ............................................................................................ 50
3.6.2 Manual Locking Process.................................................................................................. 54
3.6.3 Adjustable Locking Time................................................................................................. 58
3.6.4 Adjustable Loop Bandwidth .......................................................................................... 58
3.6.5 Locking to Digital Timing from a Deserializer ......................................................... 60
3.7 Clock Synthesis .............................................................................................................................. 61
3.7.1 Video Clock Synthesis...................................................................................................... 61
3.7.2 Audio Clock Synthesis (GS4911B only)...................................................................... 63
3.8 Video Timing Generator .............................................................................................................. 67
3.8.1 10 Field ID Pulse................................................................................................................. 67
3.8.2 Audio Frame Synchronizing Pulse (GS4911B only)............................................... 68
3.8.3 USER_1~4 ............................................................................................................................. 69
GS4911B/GS4910B HD/SD/Graphics Clock and Timing
Generator with GENLOCK
Data Sheet
36655 - 5
June 2009
5 of 119

5 Page





GS4911B arduino
Table 1-1: Pin Descriptions (Continued)
Pin
Number
9
Name
CORE_GND
10 ANALOG_VDD
11, 20, 63
12
NC
ANALOG_GND
13 AUD_PLL_GND
(GS4911B only)
ANALOG_GND
(GS4910B only)
14 AUD_PLL_VDD
(GS4911B only)
ANALOG_GND
(GS4910B only)
15 10FID
16 HSYNC
Timing
Type Description
– Power
Supply
– Power
Supply
––
– Power
Supply
– Power
Supply
– Power
Supply
– Power
Supply
– Power
Supply
Non Input
Synchronous
Non Input
Synchronous
Ground connection for core and I/O. Solder to the ground plane of
the application board.
NOTE: The CORE_GND pin should be soldered to the same main
ground plane as the exposed ground pad on the bottom of the
device.
Most positive power supply connection for the analog input block.
Connect to +1.8V DC.
Do not connect.
Ground connection for the analog input block. Connect to GND.
Ground connection for the audio clock synthesis internal block.
Connect to GND.
Ground connection for the analog input block. Connect to GND.
Most positive power supply connection for the audio clock synthesis
internal block. Connect to +1.8V DC.
Ground connection for the analog input block. Connect to GND.
REFERENCE SIGNAL INPUT
Signal levels are LVCMOS/LVTTL compatible.
The 10FID external reference signal is applied to this pin by the
application layer. 10FID defines the field in which the video and
audio clock phase relationship is defined according to SMPTE
318-M. It is also used to define a 3:2 video cadence.
NOTE: If the input reference format does not include a 10 Field ID
signal, this pin should be held LOW. See Section 3.4.2 on page 44.
REFERENCE SIGNAL INPUT
Signal levels are LVCMOS/LVTTL compatible.
The HSYNC external reference signal is applied to this pin by the
application layer. When the GS4911B/GS4910B is operating in
Genlock mode, the device senses the polarity of the HSYNC input
automatically, and references to the leading edge.
If the user wishes to select one of the pre-programmed video and/or
timing output signals provided by the device, then this signal must
adhere to one of the 36 defined video or 16 different graphics
display standards supported by the device. In this mode of
operation, the HSYNC input provides a horizontal scanning
reference signal.
The HSYNC signal may have analog timing, such as from a sync
separator, or may be digital such as from an SDI deserializer.
Section 1.4 on page 20 describes the 36 video formats and 16
graphic formats recognized by the GS4911B/GS4910B.
GS4911B/GS4910B HD/SD/Graphics Clock and Timing
Generator with GENLOCK
Data Sheet
36655 - 5
June 2009
11 of 119

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