STV2310 datasheet(43/112 Pages) STMICROELECTRONICS

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STV2310

Functional Description

● Generation of Per-byte Parity check flags.

4.13.1.5 Gemstar Features

● Search of Gemstar data during the line 21 (NTSC) or line 22 (PAL), regardless of the field

information.

● Optional Extended slicing during all the VBI (line 5 to 25 /NTSC or 2 to 25 /PAL), regardless of

the field information.

● Recognition and check of usual Gemstar Frame code (x011x1x1b)

● Recognition and check of tighter Gemstar Frame code (10110111b)

4.13.2 Data Output Format (DOF)

The Data Output Format stage will add the following data items to those received from the VBI

Formatting unit:

● An ancillary preamble

● A User Data Word Count

● Filler Words

● A User Data Word checksum

It will then perform the following operations:

● Byte-to-nibble Data conversion operations

● Calculation of word-wise parity control bits

● User Data Word checksum calculation

The data output flow issued by the Data Output Format is inserted into an ITU-R BT.656-type

digitized stream which complies with specifications ITU-R BT.656, ITU-R BT.1364 and SMPTE

291M.

In particular, the data flow follows the 8-bit data coding convention. Ancillary data is coded as “Type

2" 8-bit data items (as defined in both ITU.1364 and SMPTE 291M specifications).

A maximum of 100 bytes are used in the Blanking Interval for ancillary data. For more information,

refer to Table 12: Frame Output Standards.

The Data Output Format unit provides the following data on a TV line base:

● The Transport layer which consists of the Ancillary Data Flag (ADF), Data ID (DID), Secondary

Data ID (SDID), Data Count (DC) and Checksum Word (CS).

● The entire data flow generated by the Hardware Filtering, after having split each byte into

nibble format.

● The current TV Line value, from which the data was extracted.

EAV

Blanking Interval

SAV

Video Digitalized Stream

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