GS2972 Datasheet, PDF (66/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

4.8.1.1 Separate Line Operating Mode
In Separate Line mode, it is possible to insert horizontal or vertical ancillary data on up
to four lines per video frame. In Separate Line mode, the ANC_PACKET_BANK bits are
separated in four sections. Each section consists of 64 x 16-bit registers.
ANC_PACKET_BANK_1 uses registers 040h to 07Fh. ANC_PACKET_BANK_2 uses
registers 080h to 0BFh. ANC_PACKET_BANK_3 uses registers 0C0h to 0FFh.
ANC_PACKET_BANK_4 uses registers 100h to 13Fh. HANC or VANC can be specified,
independently of each other, on a per-line basis. 025h FIRST_LINE_NUMBER, 027h
SECOND_LINE_NUMBER, 029h THIRD_LINE_NUMBER and 02Bh
FOURTH_LINE_NUMBER. For each of the four video lines, up to 128 x 8-bit HANC or
VANC data words can be inserted. Separate Line mode is selected by setting the
ANC_INS_MODE bit in the host interface LOW. By default, at power up, Separate Line
mode is selected.
The lines on which ancillary data is to be inserted is programmed in the host register
addresses 025h to 02Ch.
For HD formats, the stream into which the ancillary data is to be inserted (Luma or
Chroma) is also programmed in these register addresses.
The non-zero video line numbers on which to insert the ancillary data, the ancillary data
type (HANC or VANC), and the total number of words to insert per line must be provided
via the host interface (see Section 4.14). At power up, or after system reset, all ancillary
data insertion line numbers and total number of words default to zero.
If the total number of Data Words specified per line exceeds 128 only the first 128 Data
Words will be inserted, the rest will be ignored.
The data words are programmed as two 8-bit values per address, starting at host
interface address 040h in the ANC_PACKET_BANK register (see Table 4-34).
The device automatically converts the provided 8-bit Data Words into the 10-bit data,
formatted according to SMPTE ST 291 prior to insertion.
4.8.1.2 Concatenated Operating Mode
In Concatenated mode, it is possible to insert up to 512 8-bit horizontal or vertical
ancillary Data Words on one line per video frame. Concatenated Line mode can be
selected by setting the ANC_INS_MODE bit in the host interface HIGH. By default, at
power up, Separate Line mode is selected.
In Concatenated mode, only the FIRST_LINE registers of the host interface need to be
programmed (addresses 025h and 026h). See Table 4-34.
The non-zero video line number on which to insert the ancillary data, the ancillary data
type (HANC or VANC), and the total number of words to insert must be provided via the
host interface. At power up, or after system reset, the ancillary data insertion line
number and total number of words default to zero.
If the total number of data words specified exceeds 512 only the first 512 Data Words
will be inserted, the rest will be ignored.
The data words are programmed as two 8-bit values per address, starting at host
interface address 040h in the ANC_PACKET_BANK register. See Table 4-34.
The device automatically converts the provided 8-bit data words into the 10-bit data
formatted according to SMPTE ST 291 prior to insertion.
GS2972 3G/HD/SD-SDI Serializer with Complete
SMPTE Audio & Video Support
Final Data Sheet Rev. 9
GENDOC-047479 September 2013
www.semtech.com
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