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GS9090B Datasheet(PDF) 33 Page - Gennum Corporation

Part # GS9090B
Description  GenLINX짰 III 270Mb/s Deserializer for SDI
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Manufacturer  GENNUM [Gennum Corporation]
Direct Link  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GS9090B Datasheet(HTML) 33 Page - Gennum Corporation

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GS9090B Data Sheet
40749 - 2
January 2007
33 of 71
3.9.2 Ancillary Data Detection and Indication
The GS9090B will detect all types of ancillary data in either the vertical or horizontal
data spaces. The ANC status signal is provided to indicate the position of ancillary
data in the output data stream. This signal is available for output on the
multi-function output port pins (see Section 3.12).
The ANC status signal is synchronous with PCLK and can be used as a clock
enable to external logic, or as a write enable to an external FIFO or other memory
device. The ANC signal will be asserted HIGH whenever ancillary data is detected
in the video data stream (see Figure 3-7). Both 8-bit and 10-bit ancillary data
preambles will be detected by the GS9090B.
NOTE: When the internal FIFO is configured for video mode, the ANC signal will
be timed to the data output from the FIFO (see Section 3.10.1).
Figure 3-7: ANC Status Signal
3.9.2.1 Programmable Ancillary Data Detection
The GS9090B will detect all types of ancillary data by default. In addition, up to five
different ancillary data types can be programmed for detection. This is
accomplished by programming the ANC_TYPE registers with the DID and/or SDID
values, via the host interface, for each data type to be detected (see Table 3-4).
The GS9090B will compare the received DID and/or SDID with the programmed
values and assert ANC only if an exact match is found.
If the DID or SDID values are set to zero in the ANC_TYPE register, a comparison
or match for that codeword will not be made. For example, if the DID is
programmed but the SDID is set to zero, the device will detect all ancillary data
types matching the DID value, regardless of the SDID. If both DID and SDID values
are non-zero, then the received ancillary data type must match both the DID and
SDID cases before the device will assert ANC HIGH.
In the case where all five DID and SDID values are set to zero, the GS9090B will
detect all ancillary data types. This is the default setting after a device reset.
If greater than one, but less than five, DID and/or SDID values have been
programmed, then only those matching ancillary data types will be detected and
indicated.
NOTE: See SMPTE 291M for a definition of ancillary data terms.
3FF
000
3FF
DID
DBN
DC
ANC DATA
ANC DATA
CSUM
BLANK
ANC
Y'CbCr DATA
PCLK


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