GS2962 Datasheet, PDF (41/82 Pages) Gennum Corporation – Integrated Narrow-Bandwidth PLL

When INSSYNCIN is set HIGH, the GS2962 inserts K28.5 sync characters into the data
stream. This function is used to assist system implementations where the GS2962 may
be preceded by a data FIFO.
The FIFO can be fed data at a rate somewhat less than 27MHz. The ‘FIFO empty’ signal
could be used to feed the INSSYNCIN pin, causing the GS2962 to pad the data up to the
transmission rate of 27MHz.
When KIN is set HIGH the data input is interpreted as a special character (such as a K28.5
sync character), as defined by the DVB-ASI standard. When KIN is set LOW the input is
interpreted as data.
After sync signal insertion, the GS2962 8b/10b encodes the data, generating a 10-bit
data stream for the parallel to serial conversion and transmission process.
4.5 Data-Through Mode
The GS2962 may be configured to operate as a simple parallel-to-serial converter. In this
mode, the device passes data to the serial output without performing any scrambling or
encoding.
Data-through mode is enabled only when both the SMPTE_BYPASS and DVB_ASI pins
are set LOW.
4.6 Standby Mode
The STANDBY pin reduces power to a minimum by disabling all circuits except for the
register configuration. Upon removal of the signal to the STANDBY pin, the device
returns to its previous operating condition within 1 second, without requiring input
from the host interface.
In addition, the serial digital output signals becomes high-impedance when the device
is powered-down.
4.7 ANC Data Insertion
Horizontal or vertical ancillary data words may be inserted on up to four different lines
per video frame.
Up to 512 data words may be inserted per frame with all Data Words - including the ANC
packet ADF, DBN, DCNT, DID, SDID and CSUM words - being provided by the user via
host interface configuration.
The CSUM word is re-calculated and inserted by the ANC Data Checksum Calculation
and Insertion function.
Note that any value may be used for the CSUM word, provided that it is outside the
protected ranges from 000h to 003h and from 3FCh to 3FFh. If a CSUM value in either of
these ranges is used, it will not be corrected by the device.
GS2962 3G/HD/SD-SDI Serializer with Complete
SMPTE Video Support
Data Sheet
48005 - 7
October 2010
41 of 82