STV2310 datasheet(42/112 Pages) STMICROELECTRONICS

42 / 112 page

Functional Description

STV2310

42/112

Note:

The WST - Teletext C and D (525 lines /60 Hz) formats (NATBS - MOJI) may be covered by the

WST - Teletext B (525 lines -60 Hz) format.

4.13.1 VBI Formatting Features

4.13.1.1 VPS Features

Video Programming System (VPS) data complies with ETSI specifications.

● Search of VPS data on TV line 16 of each field

● Optional Extended VPS data on three TV lines (15,16 and 17) of each field

● Search of VPS data regardless of the field information

● Recognition of Start code

● Sampling and decoding of bytes 5 and 11 to 14

● Bi-phase code check

● Generation of bi-phase correctness flags

4.13.1.2 WSS Features

Wide Screen Signaling (WSS) data complies with ETSI specifications.

● Search of WSS data on TV line 23 of each field

● Optional Extended WSS data on four TV lines (21, 22, 23 and 24) of each field

● Search of WSS data regardless of the field information

● Recognition of Start code

● Sampling and decoding of relevant 14 bits

● Bi-phase code check

● Generation of bi-phase correctness flags

4.13.1.3 WST Features

World System Teletext (WST) data complies with ETSI specifications. The searched WST format is

unique at a given time and is programmed by software through register-based control bits (50 Hz or

60 Hz, etc.).

● Search of WST data starting at TV line 6 for 525-line broadcasts, or TV line 318 for 625-line

broadcasts.

● Optional Extended WST data search starting at 2nd TV line (register-based control bit).

● Recognition and check of usual WST frame code (27h).

● Optional recognition and check of programmable extended frame code (register-based value -

but the three LSBs must be kept at ‘1’).

● Recognition of all packets or recognition of only Service Packets X/30 and X/31 (register-

based control bit).

● Hamming decode & check of Magazine and Page bytes for usual frame code.

● Split of Magazine & Page data in two separate bytes (1st byte is for Magazine, 2nd for Page).

4.13.1.4 Closed Caption Features

● Search of CC data during 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 CC Frame code (11000b).

● Recognition and check of tighter CC Frame code (C2h).

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