GS2960 Datasheet, PDF (57/97 Pages) Semtech Corporation – 3Gb/s, HD, SD SDI Receiver Complete with SMPTE Video Processing

Table 4-11: Data Format Register Codes (Continued)
YDATA_FORMAT[3:0] or
CDATA_FORMAT[3:0]
9h
Ah ~ Eh
Fh
Data Format
HD-SDTI
Reserved
Non-SMPTE data
format
Remarks
−
−
Detected data format is not SMPTE.
SMPTE_BYPASS = LOW or LOCKED =
LOW
The data format is determined using the following criteria:
• If TRS ID words are detected but no SDTI header or TDM header is detected, then
the data format is SDI
• If TRS ID words are detected and the SDTI header is available then the format is
SDTI
• If TRS ID words are detected and the TDM data header is detected then the format is
TDM video
• No TRS words are detected, but the PLL is locked, then the data format is unknown
NOTE: Two data format sets are provided for HD video rates. This is because the Y and
Cr/Cb channels can be used separately to carry SDTI data streams of different data
formats. In SD video mode, only the Y data format register contains the data, and the C
register is set to Fh (undefined format).
4.15 EDH Detection
4.15.1 EDH Packet Detection
The GS2960 determines if EDH packets are present in the incoming video data and
asserts the EDH_DETECT status according to the SMPTE standard.
EDH_DETECT is set HIGH when EDH packets have been detected and remains HIGH
until EDH packets are no longer present. It is set LOW at the end of the vertical blanking
(falling edge of V) if an EDH packet has not been detected during vertical blanking.
EDH_DETECT can be programmed to be output on the multi-function output port pins.
The EDH_DETECT bit is also available in the host interface.
4.15.2 EDH Flag Detection
The EDH flags for ancillary data, active picture, and full field regions are extracted from
the detected EDH packets and placed in the EDH_FLAG_IN register.
When the EDH_FLAG_UPDATE_MASK bit in the host interface is set HIGH, the GS2960
updates the Ancillary Data, Full Field, and Active Picture EDH flags according to SMPTE
RP165. The updated EDH flags are available in the EDH_FLAG_OUT register. The EDH
packet output from the device contains these updated flags.
One set of flags is provided for both fields 1 and 2. The field 1 flag data is overwritten by
the field 2 flag data.
GS2960 3Gb/s, HD, SD SDI Receiver Complete with
SMPTE Video Processing
Data Sheet
48003 - 6
September 2012
57 of 97