GS2962 Datasheet, PDF (51/82 Pages) Gennum Corporation – Integrated Narrow-Bandwidth PLL

NOTE: The only exception is when the SMPTE425M mapping is Level B twin
SMPTE292M streams, and one or both of the SMPTE292M streams carries HD-SDTI data.
In this case the HD-SDTI header packets are used for payload identification.
4.8.2.1 Level A and Level B Signals:
The GS2962 uses SMPTE 352M packets to determine the video format. The SMPTE 352M
packets used for format detection will either be:
• When the 352_INS (address 000h bit 6) bit is LOW, then if either bit 6 or 7 of address
20Ah are HIGH, the format is 3G Level B. If both are LOW, then it will look at the
information programmed at address 00Ah VIDEO_FORMAT_OUT_DS1_X. See
SMPTE 425M Standard for details.
• When the bit is HIGH, the format is 3G Level A.
Extraction of 352M packets cannot be done in 3G Level B.
The GS2962 uses the programmed SMPTE 352M packets if the 352_INS register bit in the
IOPROC register is HIGH.
If there are no SMPTE 352M packets embedded in the input signal, and the user does not
embed SMPTE 352M packets from the host interface, the GS2962 assumes an input
signal of 1080p/50 or 1080p/59.94. The GS2962 uses information from the
RASTER_STRUC_X registers to select between these two frame rates.
If there are no SMPTE 352M packets embedded in the input signal, the GS2962 will raise
an error flag in the “NO_352_ERR” bit.
If there are 352M packets present in the stream, the GS2962 reports the extracted SMPTE
352M packets in the VIDEO_FORMAT_352_IN registers in the host interface. The user
can use this information, along with the RASTER_STRUC_X registers, to determine the
video format.
If there is a conflict between the numbers in the registers and the format defined in the
SMPTE 352M packets, the GS2962 will raise a TIMING_ERROR_352 flag via the host
interface.
NOTE: SMPTE 352M packets will not be present in an HD-SDTI input stream, and will
not be embedded in an output HD-SDTI serial stream. This is controlled by the user as
described in Section 4.8.8.1.
By default (at power up or after system reset), the VIDEO_FORMAT_352_IN registers are
set to zero (undefined video format). These registers are also cleared when the
SMPTE_BYPASS pin is set LOW, or the LOCKED pin is LOW. The SMPTE 352M packet
should be received once per field for interlaced systems and once per frame for
progressive video systems. If the packet is not received for two complete video frames,
the VIDEO_FORMAT_352_IN registers are cleared to zero.
GS2962 3G/HD/SD-SDI Serializer with Complete
SMPTE Video Support
Data Sheet
48005 - 7
October 2010
51 of 82