STV2310 datasheet(21/112 Pages) STMICROELECTRONICS

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STV2310

Functional Description

4.5

Standard Research Sequence Programming

The chroma signal is sent to the Standard Identifier and Chroma Demodulator. The Standard

Identifier performs an automatic recognition sequence for one of the following standards.

Note 1: Codes 110 and 111 are associated with “No Standard”.

From this list of possible standards, the user must complete the Automatic Standard Recognition

table required for the automatic search. Identification will be restricted to the table entries and the

first entry will be tried first. Entering code 110 or 111 in the Automatic Standard Recognition table

terminates the standard sequence search. It is possible to enter several times the same code. The

Automatic Standard Recognition table and its default values are presented in Table 7.

If the default values are used, code 111 (no standard) is the fourth entry and the standard

identification will be restricted to the first three standards (in order PAL BGDHI, SECAM and

NTSC M).

Each standard recognition trial period lasts 2 fields. All trials corresponding to table entries are

performed. The identification decision is based on the results of the trials and a single table entry

Table 6: TV Standards

Chroma Standard

Subcarrier Frequency

Standard Code

PAL B,D,G,H,I

4.4336 MHz

000

SECAM

4.406 MHz (foR)

4.250 MHz (foB)

001

NTSC M

3.5795 MHz

010

PAL M

3.5756 MHz

011

PAL N

3.5820 MHz

100

NTSC 4.43

4.4336 MHz

101

No Standard1

n/a

110

No Standard1

n/a

111

Table 7: Automatic Standard Recognition Table

Standard

Entries

Code

(Default values)

Standard 1

000

DDECCONT4[5:0]

Standard 2

001

Standard 3

010

DDECCONT3[5:0]

Standard 4

111

Standard 5

001

DDECCONT2[5:0]

Standard 6

001

Standard 7

111

DDECCONT1[5:0]

Standard 8

111

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