SMPTE291M.pdf
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1 Scope
1.1 This standard specifies the basic formatting
structure of the ancillary data space in the digital
video data stream in the form of 10-bit words.
Application of this standard includes 525-line,
625-line, component or composite, and high-
definition digital television interfaces which
provide 8- or 10-bit data ancillary data space.
1.2 Space available for ancillary data packets is
defined in the document specifying the connecting
interface.
1.3 Ancillary data packet formatting for a
specific application may be according to a
SMPTE standard or recommended practice. In
such a case, the format is considered a regis-
tered format, which is identified by a registered
data identification word.
2 Overview
2.1 The serial digital interface (ANSI/SMPTE
259M) and component parallel digital interface
(ANSI/SMPTE 125M) are capable of passing 10-
bit words (Data 9 -- Data 0), but some of the
existing equipment is only capable of processing
8-bit data words (carried on the interface as Data
9 -- Data 2). The passage of 10-bit words through
such equipment will therefore result in truncation
of the last two LSBs (Data 1 and Data 0) of the
ancillary data word. Upon serializing an 8-bit
word (Data 9 -- Data 2) for a 10-bit word trans-
mission, the two LSBs (Data 1 and Data 0) are
usually replaced by zeros in such equipment.
For these reasons, the original ancillary data
would be corrupted to 6 bits and an 8-bit applica-
tion without restrictions would not be possible.
By reserving specific data identification, 8-bit
words having the two LSBs set to zero for such
an 8-bit data application, operation through a
10-bit interface is possible. These DID words
therefore will not be corrupted either by trunca-
tion or by setting the two LSBs to zero.
2.2 Ancillary data packets are divided into type
1 and type 2, where type 1 uses a single ID word
and type 2 uses two ID words. Using this method
allows for a wider range of identification values
within the limited ID word space. In addition,
a total of 189 data identification values are
reserved for 8-bit applications, whereas up to
approximately 29,000 values are provided for
10-bit applications.
2.3 The basic formats of the ancillary data packets
are similar for both type 1 and type 2, but they
differ in the use of a data block number. The
definitions of the individual parts that make up
the ancillary data packet, such as ancillary data
flags (ADF), data identification (DID), secondary
data identification (SDID), data block numbers
(DBN), data count (DC), data validity checksum
(CS), together with the restrictions on used data,
are contained in this standard.
3 Ancillary data packet format
3.1 Ancillary data packet
3.1.1 The two types of ancillary data packets in
a data stream may be formatted into type 1 and
type 2, which depend upon the data identifica-
tion word. These two types are shown in figures
1a and 1b.
for Television ----
Ancillary Data Packet
and Space Formatting
Revision of
ANSI/SMPTE 291M-1996
SMPTE 291M-1998
SMPTE STANDARD
Page 1 of 14 pages
Approved
October 1, 1998
Copyright © 1998 by THE SOCIETY OF
MOTION PICTURE AND TELEVISION ENGINEERS
595 W. Hartsdale Ave., White Plains, NY 10607
(914) 761-1100
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