STV2310 datasheet(44/112 Pages) STMICROELECTRONICS

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Functional Description

STV2310

44/112

Ancillary Data Flow

For each TV line, the following sequence is generated immediately after the EAV code:

DID & SDID Coding Convention

All VBI data formats recognized by the Slicer use the same Data ID value. This Data ID value is

programmed in the SLDID[5:0] bits in the VBICONT1 register. The default value of the DID register

is "000001" respecting an 8-bit format and coding for 8-bit applications, in compliance with SMPTE

291M specifications (the full default code is 41h when parity control bits are added). Bits 6 and 7 of

the DID value are hardware calculated (bit 6 is the even parity of bits 5 to 0, bit 7 is the binary

complement of bit 6).

Note:

All possible DID values are coded using a Type 2 ancillary data coding format.

The Secondary Data ID codes (SDID) identify the recognized data formats as follows:

ADF

DID

SDID

UDWi

3 Bytes

1 Byte

User Data

Words

1 Byte

00h - FFh - FFh

41h

Format ID

UDW Count

Sliced Data in

nibble

Checksum

Table 15: Secondary ID Codes

SDID1

1. 8-bit Format

SDID Byte

Comments

41h

WSS (No field link)

42h

(Not used)

83h

VPS (No field link)

44h

Closed Caption - Field 2

85h

Closed Caption - Field 1

86h

Gemstar - Field 2

47h

Gemstar - Field 1

48h

Teletext B - 625 lines/50 Hz - Field 2

Frame Code: 27h - F = 6.9375 MHz

89h

Teletext B - 625 lines/50 Hz - Field 1

Frame Code: 27h - F = 6.9375 MHz

8Ah

Teletext B - 625 lines/50 Hz - Field 2

Frame Code: XXh2 - F = 6.9375 MHz

4Bh

Teletext B - 625 lines/50 Hz - Field 1

Frame Codecode: XXh2 - F = 6.9375 MHz

2. A different Frame Code (from the usual one) has been validated for this data.

The field information can be recovered from the Data ID value.

50h

Teletext B - 525 lines/60 Hz - Field 2

Frame Code: 27h - F = 5.727272 MHz

91h

Teletext B - 525 lines/60 Hz - Field 1

Frame Code: 27h - F = 5.727272 MHz

92h

Teletext B - 525 lines/60 Hz - Field 2

Frame Code: XXh2 - F = 5.727272 MHz

53h

Teletext B - 525 lines/60 Hz - Field 1

Frame Code: XXh2 - F = 5.727272 MHz

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