GS2971A Datasheet, PDF (70/152 Pages) Gennum Corporation – Integrated audio clock generator

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 GS2971A 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 five different ancillary data types may be programmed for detection by the GS2971A
in the ANC_TYPE_DS1 registers for SD, HD and 3G Level A data.
When so programmed, the GS2971A only indicates the presence of the specified
ancillary data types, ignoring all other ancillary data. For each data type to be detected,
the user must program the DID and/or SDID of that ancillary data type. In the case
where no DID or SDID values are programmed, the GS2971A indicates the presence of
all ancillary data. In the case where one or more, DID and/or SDID values have been
programmed, then only those matching data types are detected and indicated.
The timing of the Y/1ANC and C/2ANC signals in this case is as shown in Figure 4-31.
The GS2971A compares the received DID and/or SDID with the programmed values. If
a match is found, ancillary data is indicated.
For any DID or SDID value set to zero, no comparison or match is made. For example, if
the DID is programmed and the SDID is not programmed, the GS2971A only detects a
match to the DID value.
GS2971A 3Gb/s, HD, SD SDI Receiver
Data Sheet
54311 - 2
September 2012
70 of 152