STV2310 datasheet(71/112 Pages) STMICROELECTRONICS

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STV2310

DDECCONT18

STI_NB_FIELDS

_CONFIRM[2:0]

Number of Fields to be Confirmed

This bitfield operates on the second stage of the standard identification algorithm: the confirmation stage. It

gives the number of consecutive fields where the standard criteria must be OK before the standard

identification is confirmed.

000: 1 field 100: 8 fields

001: 3 fields (default) 101: 32 fields

010: 7 fields 110: 45 fields

011: 10 fields 111: 63 fields

SPC_OVERLOA

D_OFF

Cover coefficient forced to 1

The SPC_ACC_OFF and SPC_OVERLOAD_OFF bits are related to the ACC and ACC Overload

mechanisms operating on the CVBS flow. These regulating algorithms are a complement to the AGC

operating on the CVBS and the Y amplitudes).

The ACC and ACC Overload mechanisms operate on the chroma (C) amplitude in the CVBS flow. The ACC

(automatic chroma control) operates with the Cburst burst scale factor. The ACC overload mechanism

operates with the Cover chroma correction factor. Both Cburst and Cover values are internal variables.

The Cover variable carries the maximum chroma value measured during the video line.

0: Cover coefficient is not forced to 1 (Overload mechanism).

1: Cover coefficient is forced to 1.

SPC_ACC_OFF

Cburst coefficient forced to 1

The Cburst variable carries the input video burst amplitude. When that amplitude is different from the

standard, demodulated chroma components are scaled with Cburst. Cburst change rate and change steps

are also programmable. See registers DDECCONT20[1:0] = SPC_ACC_KTHBURST[1:0] ,

DDECCONT20[5:4] = SPC_ACC_NB_LINEUP[1:0] , DDECCONT20[7:6] = SPC_ACC_NB_LINEDW[1:0].

0: Cburst coefficient is not forced to 1 (ACC. mechanism).

1: Cburst coefficient is forced to 1.

Address (hex): 18h

Reset Value (bin): 0101 1001

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

BW_SEL[2:0]

NONINTER

LACED_EN

OUT_

RANGE

COMB_

MODE

Bit Name

Function

Bit 7

Reserved. Must be set to 0.

BW_SEL[2:0]

Notch Width Select

This register offers the possibility to select the notch width:

000: Notch filter the narrowest

111: Notch filter the widest

Bit Name

Function

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