Application: Multi-format Digital VTR/Video Server
V ideo Inputs
20-bit
Video
Processor
Storage:
Tape/HDD/Solid State
Audio
Processor
HV F /P CLK
AUDIO 1/ 2
AUDIO 3/ 4
AUDIO 5/ 6
AUDIO 7/ 8
Audio Clocks
GS2972
3G-SDI
TRS words, calculate and insert line numbers and line based
CRCs, re-map illegal code words, map 8-bit TRS to 10-bit
TRS, calculate and insert EDH CRCs and flags, and insert
SMPTE 352M payload identifier packets. All of the
processing features are optional, and may be disabled via
external control pins and/or via the Host Interface.
The GS2972 provides ancillary data insertion in SMPTE
mode as well. The entire ancillary packet is programmed
into internal registers through the GSPI Host Interface,
including the Ancillary Data Flag (ADF), Data Identification
words (DID and SDID) and checksum. The GS2972 then
recalculates the checksum and inserts the complete
ancillary packet into the video stream.
The user may present the parallel data as either SMPTE
425M Level B or Level A. If the parallel data is presented as
Level A, it may be processed and serialized as Level A or
converted to Level B (conversion only available for 1080p
50/60 4:2:2 10-bit). If the parallel data is presented as Level
B then the serial data will also be Level B.
In DVB-ASI mode, the device will perform 8b/10b encoding
prior to transmission.
In Data-Through mode, all SMPTE and DVB-ASI processing
is disabled, and the device can be used as a simple parallel
to serial converter.
The device can also be placed in a lower power Standby
mode. In this mode, no signal is generated at the output.
Parallel data inputs must be provided in 20-bit or 10-bit
multiplexed format for 3Gb/s, HD and SD video rates. For
1080p 50/60 4:2:2 10-bit video formats, the video data can
be presented at the parallel bus with Y on 10 bits and Cb/Cr
on the other 10 bits. As such, this parallel bus can interface
directly with video processor ICs. For all other format
described in SMPTE 425M, the user must map the data to the
20-bit virtual interface as described in the standard. The
device can accept both the 20-bit virtual interface directly,
or the equivalent pre-multiplexed 10-bit format. The
associated Parallel Clock input signal operates at 148.5 or
148.5/1.001MHz (for all 3Gb/s HD 10-bit multiplexed
modes), 74.25 or 74.25/1.001MHz (for HD 20-bit mode),
27MHz (for SD 10-bit mode) and 13.5MHz (for SD 20-bit
mode).
Note: for 3Gb/s 10-bit mode the device operates in Dual
Data Rate (DDR) mode, where the data is sampled at both
the rising and falling edges of the clock. This reduces the I/O
speed requirements of the downstream devices.
Audio Inputs
GS4911
Sync
Seperator
Analog
Sync
X TAL
Application: 3Gb/s SDI Test Signal Generator
Memory
X TAL
Analog
Sync
Sync
Seperator
20-bit
GS4911
HV F/PCLK
Video
Signal
Generator
HV F/PCLK
3G-SDI
AE S 1/ 2
Audio Clocks
GS2972
Audio
Generator
AE S 3/ 4
AE S 5/ 6
AE S 7/ 8
Application: Multi-format Presentation Switcher
(Output Stage)
P rogram AE S In
P reset AE S In
V oice-Over
AE S from Input Dem ux
P rogram AE S Out
Audio
Mixer
P review AE S Out
I2S Audio + Clocks
SD/HD/3G-SDI
Auxiliary
10-bit + Clk
GS2972
SD/HD/3G-SDI
Preview
20-bit + Clk
DVE
Mixers
Key & Fill
Keyer
Keyer
Logo
Inserter
GS2972
SD/HD/3G-SDI
Program
20-bit + Clk
GS2972
Key/Fill
Inputs
Image
Store
Analog
Sync
Sync
Seperator
GS4911
Clock &
Sync Distribution
X TAL
Description
The GS2972 is a complete SDI Transmitter, generating a
SMPTE 424M, SMPTE 292M, SMPTE 259M-C or DVB-ASI
compliant Serial Digital Output signal.
The integrated ClockCleaner™ allows the device to accept
parallel clocks with greater than 300ps input jitter and still
provide a SMPTE compliant Serial Digital Output.
The device can operate in four basic user-selectable modes:
SMPTE mode, DVB-ASI mode, Data-Through mode, and
Standby mode.
In SMPTE mode, the GS2972 performs SMPTE scrambling
and NRZ to NRZI coding. In addition, the device can insert
GS2972 3Gb/s, HD, SD SDI Transmitter
Product Brief
44723 - E
June 2008
2 of 4
GENNUM [ GENNUM CORPORATION ]
