GS2961A Datasheet, PDF (66/104 Pages) Gennum Corporation – Ancillary data extraction

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 4-31.
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 4-31:Y/1ANC and C/2ANC Signal Timing
ANC DATA
CSUM
BLANK
4.17.1 Programmable Ancillary Data Detection
As described above in Section 4.17, the GS2961A detects and indicates all ancillary data
types by default.
It is possible to program which ancillary data types are to be detected and indicated. Up
to 5 different ancillary data types may be programmed for detection by the GS2961A in
the ANC_TYPE_DS1 registers for SD, HD and 3G Level A data.
GS2961A 3Gb/s, HD, SD SDI Integrated Receiver
Data Sheet
54385 - 2
September 2012
66 of 104