GS2960 Datasheet, PDF (61/97 Pages) Semtech Corporation – 3Gb/s, HD, SD SDI Receiver Complete with SMPTE Video Processing

The FF_CRC_ERR bit in the VIDEO_ERROR_STAT_X register is set HIGH when a Full
Field CRC mismatch has been detected in field 1 or 2.
EDH CRC errors are only indicated when the device is operating in SD mode and when
the device has correctly received EDH packets.
4.16.4 HD & 3G Line Number Error Detection
If a mismatch in the calculated and received line numbers is detected, the LNUM_ERR
bit in the VIDEO_ERROR_STAT_X register is set HIGH.
4.17 Ancillary Data Detection & Indication
The GS2960 detects ancillary data in both the vertical and horizontal ancillary data
spaces. Status signal outputs Y/1ANC and C/2ANC are provided to indicate the position
of ancillary data in the output data streams. These signals may be selected on the
multi-function I/O port pins (STAT[5:0]).
The GS2960 indicates the presence of all types of ancillary data by detecting the 000h,
3FFh, 3FFh (00h, FFh, FFh for 8-bit video) ancillary data preamble.
NOTE: Both 8 and 10-bit ancillary data preambles are detected by the device.
By default (at power up or after system reset) the GS2960 indicates all types of ancillary
data. Up to 5 types of ancillary data can be specifically programmed for recognition.
For HD video signals, ancillary data may be placed in both the Y and Cb/Cr video data
streams separately. For SD video signals, the ancillary data is multiplexed and combined
into the YCbCr data space.
For 3G signals, ancillary data may be placed in either or both of the virtual interface data
streams. Both data streams are examined for ancillary data.
For a 3G data stream formatted as per Level A mapping:
• The ancillary data is placed in Data Stream 1 first, with overflow into Data Stream 2
• SMPTE 352M packets are duplicated in both data streams
For a 3G data stream formatted as per Level B mapping:
• Each multiplexed data stream forming the 3G signal contains ancillary data
embedded according to SMPTE 291M
• Each multiplexed data stream forming the 3G signal contains SMPTE 352M packets
embedded according to SMPTE 425M
When operating in HD mode, the Y/1ANC signal is HIGH whenever ancillary data is
detected in the Luma data stream, and C/2ANC is HIGH whenever ancillary data is
detected in the Chroma data stream. The signals are asserted HIGH at the start of the
ancillary data preamble, and remain HIGH until after the ancillary data checksum.
When detecting ancillary data in 3G Level A data, the Y/1ANC status output is HIGH
whenever Data Stream 1 ancillary data is detected and the C/2ANC status output is
HIGH whenever Data Stream 2 ancillary data is detected.
When detecting ancillary data in 3G Level B data, the Y/1ANC status output is HIGH
whenever Data Stream 1 ancillary data is detected on either Y or C channels and the
GS2960 3Gb/s, HD, SD SDI Receiver Complete with
SMPTE Video Processing
Data Sheet
48003 - 6
September 2012
61 of 97