GS2960 Datasheet, PDF (62/97 Pages) Semtech Corporation – 3Gb/s, HD, SD SDI Receiver Complete with SMPTE Video Processing

C/2ANC status output is HIGH whenever Data Stream 2 ancillary data is detected on
either Y or C channels.
When operating in SD mode, the Y/1ANC and C/2ANC signals depend on the output
data format. For 20-bit demultiplexed data, the Y/1ANC and C/2ANC signals operate
independently to indicate the first and last ancillary Data Word position in the Luma
and/or Chroma data streams. For 10-bit multiplexed data, the Y/1ANC signal is HIGH
whenever ancillary data is detected, and the C/2ANC signal is always LOW.
When operating in 3G modes, the Y/1ANC and C/2ANC flags are both zero if the 10-bit
multiplexed output format is selected.
These status signal outputs are synchronous with PCLK and may be used as
clock-enables for external logic, or as write-enables for an external FIFO or other
memory devices.
The operation of the Y/1ANC and C/2ANC signals is shown below in Figure 4-28.
NOTE 1: When I/O processing is disabled, the Y/1ANC and C/2ANC flags may toggle,
but they are invalid and should be ignored.
NOTE 2: In 3G Level B mode, if the ANC_EXT_SEL_DS2_DS1 bit is HIGH and the
ANC_DATA_DELETE bit is HIGH, the Y/1ANC and C/2ANC flags are not valid.
NOTE 3: For 3G Level B data, the Y/1ANC flag identifies all ANC data on Data Stream 1
(Link A), whether it is embedded in the Y or C component – ANC data is not identified
separately for each component. Similarly, the C/2ANC flag identifies all ANC data on
Data Stream 2 (Link B), whether it is embedded in the Y or C component.
PCLK
LUMA DATA OUT
CHROMA DATA OUT
Y/1ANC
C/2ANC
PCLK
M U LT IP LE X E D
Y 'C b C r
Y/1ANC
C/2ANC
PCLK
LUMA DATA OUT
CHROMA DATA OUT
Y/1ANC
C/2ANC
000
000
3FF
3FF
3FF
3FF
D ID
D ID
DBN
DBN
DC
ANC DATA
CSUM
BLANK
BLANK
DC
ANC DATA
ANC DATA
ANC DATA
CSUM
000
000
3FF
A N C D A T A D E T E C T IO N - H D T V 20 B IT O U T P U T M O D E
3FF
3FF
3FF
Y D ID
CANC
YCSUM
CCSUM
BLANK
000
3FF
3FF
A N C D A T A D E T E C T IO N - H D T V 1 0 B IT O U T P U T M O D E
D ID
DBN
DC
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
CSUM
BLANK
BLANK
BLANK
A N C D A T A D E T E C T IO N - S D T V 2 0 B IT O U T P U T M O D E
PCLK
M U LT IP LE X E D
Y 'C b C r
000
3FF
3FF
D ID
DBN
DC
ANC DATA
Y/1ANC
A N C D A T A D E T E C T IO N - S D T V 10 B IT O U T P U T M O D E
Figure 4-28: Y/1ANC and C/2ANC Signal Timing
ANC DATA
CSUM
GS2960 3Gb/s, HD, SD SDI Receiver Complete with
SMPTE Video Processing
Data Sheet
48003 - 6
September 2012
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