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TW9920: 产品描述Analog Video Decoder / Encoder; 文件大小977KB，共88页; 制造商ETC

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TW9920概述

Analog Video Decoder / Encoder

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Techwell, Inc.

TW9920 – Analog Video Decoder /

Encoder

Preliminary Data Sheet

Techwell Confidential. Information may change without notice.

Disclaimer

This document provides technical information for the user. Techwell, Inc. reserves the right to

modify the information in this document as necessary. The customer should make sure that they

have the most recent data sheet version. Techwell, Inc. holds no responsibility for any errors that

may appear in this document. Customers should take appropriate action to ensure their use of the

products does not infringe upon any patents. Techwell, Inc. respects valid patent rights of third

parties and does not infringe upon or assist others to infringe upon such rights.

TECHWELL, INC.

REV. D

08/29/2005

TW9920

Techwell, Inc. ...............................................................................1

Features........................................................................................4

Functional Description...............................................................5

General description..................................................................6

Analog Front-end .....................................................................6

Video Source Selection........................................................6

Clamping and Automatic Gain Control ................................7

Analog to Digital Converter ..................................................7

Sync Processing ......................................................................7

Horizontal sync processing ..................................................7

Vertical sync processing ......................................................7

Color Decoding ........................................................................8

Y/C separation......................................................................8

Color demodulation ..............................................................8

Automatic Chroma Gain Control..........................................9

Low Color Detection and Removal......................................9

Automatic standard detection ..............................................9

Video Format support.........................................................10

Component Processing .........................................................10

Luminance Processing.......................................................10

Gamma...............................................................................10

Sharpness...........................................................................10

The Hue and Saturation.....................................................11

Color Transient Improvement ............................................11

Power Management ..............................................................11

Control Interface.....................................................................11

Down-scaling and Cropping...............................................11

TW9920 Down-Scaling ......................................................11

TW9920 Cropping ..............................................................12

VDELAY + VACTIVE < Total number of lines per field........13

Output Interface .....................................................................14

ITU-R BT.656 .....................................................................14

VIP (Video Interface Port) ..................................................14

Horizontal Down Scaling Output........................................15

Vertical Down Scaling Output ............................................16

Raw VBI data output ..........................................................16

VBI Data Processing..............................................................17

Raw VBI data output ..........................................................17

VBI Data Slicer ...................................................................17

Sliced VBI Data output format............................................18

Audio clock generation ..........................................................24

Analog Video Encoder...........................................................26

Timing Interface and Control .................................................29

Two Wire Serial Bus Interface...............................................30

Test Modes ............................................................................32

Filter Curves...........................................................................33

Decimation filter..................................................................33

Anti-alias filter .....................................................................33

Chroma Band Pass Filter Curves......................................34

Luma Notch Filter Curve for NTSC and PAL/SECAM......35

Chrominance Low-Pass Filter Curve.................................35

Horizontal Scaler Pre- Filter curves ...................................36

Vertical Interpolation Filter curves......................................36

Peaking Filter Curves.........................................................37

Control Register ........................................................................38

TW9920 Register SUMMARY...........................................38

0x00 – Product ID Code Register (ID)..............................41

0x01 – Chip Status Register I (STATUS1)........................41

0x02 – Input Format (INFORM).........................................42

0x03 – Output Format Control Register (OPFORM) ........43

0x04 – GAMMA and HSYNC Delay Control.....................43

0x05 – Output Control I ......................................................44

0x06 – Analog Control Register (ACNTL) .........................45

0x07 – Cropping Register, High (CROP_HI) ....................45

0x08 – Vertical Delay Register, Low (VDELAY_LO) ........46

0x09 – Vertical Active Register, Low (VACTIVE_LO).......46

0x0A – Horizontal Delay Register, Low (HDELAY_LO) ...46

0x0B – Horizontal Active Register, Low (HACTIVE_LO)..46

0x0C – Control Register I (CNTRL1).................................47

0x0D – Vertical Scaling Register, Low (VSCALE_LO).....47

0x0E – Scaling Register, High (SCALE_HI) .....................47

0x0F – Horizontal Scaling Register, Low (HSCALE_LO).48

0x10 – BRIGHTNESS Control Register (BRIGHT) ..........48

0x11 – CONTRAST Control Register (CONTRAST) .......48

0x12 – SHARPNESS Control Register I (SHARPNESS) 48

0x13 – Chroma (U) Gain Register (SAT_U) .....................49

0x14 – Chroma (V) Gain Register (SAT_V)......................49

0x15 – Hue Control Register (HUE)..................................49

0x16 – Sharpness Control II (SHARP2)............................49

0x17 – Vertical Sharpness (VSHARP)..............................50

0x18 – Coring Control Register (CORING).......................50

0x19 – VBI Control Register (VBICNTL)...........................51

0x1A – Analog Control II....................................................52

0x1B – Output Control II ....................................................52

0x1C – Standard Selection (SDT) .....................................53

0x1D – Standard Recognition (SDTR)..............................54

0x1E – Component Video Format (CVFMT) ....................54

0x1F – Test Control Register (TEST)................................55

0x20 – Clamping Gain (CLMPG) ......................................56

0x21 – Individual AGC Gain (IAGC)..................................56

0x22 – AGC Gain (AGCGAIN) ..........................................56

0x23 – White Peak Threshold (PEAKWT)........................56

0x24– Clamp level (CLMPL)..............................................56

0x25– Sync Amplitude (SYNCT).......................................57

0x26 – Sync Miss Count Register (MISSCNT).................57

0x27 – Clamp Position Register (PCLAMP) .....................57

0x28 – Vertical Control I (VCNTL1)...................................58

0x29 – Vertical Control II (VCNTL2)..................................58

0x2A – Color Killer Level Control (CKILL).........................58

0x2B – Comb Filter Control (COMB).................................59

0x2C – Luma Delay and H Filter Control (LDLY)..............59

0x2D – Miscellaneous Control I (MISC1)..........................60

0x2E – LOOP Control Register (LOOP) ...........................60

0x2F – Miscellaneous Control II (MISC2) .........................61

0x30 – Macrovision Detection (MVSN) .............................62

0x31 – Chip STATUS II (STATUS2) ................................62

0x32 – H monitor (HFREF)................................................63

0x33 – CLAMP MODE (CLMD) ........................................63

0x34 – ID Detection Control (IDCNTL)..............................63

0x35 – Clamp Control I (CLCNTL1) ..................................64

0x40 – 0x48

AUDIO CLOCK....................................65

0x40 – Audio Clock Increment (ACKI) ..............................65

0x41 – Audio Clock Increment (ACKI) ..............................65

0x42 – Audio Clock Increment (ACKI) ..............................65

0x43 – Audio Clock Number (ACKN)................................65

0x44 – Audio Clock Number (ACKN)................................65

0x45 – Audio Clock Number (ACKN)................................65

0x46 – Serial Clock Divider (SDIV)....................................66

0x47 – Left/Right Clock Divider (LRDIV)...........................66

0x48 – Audio Clock Control (ACCNTL).............................66

0x4E – HBLEN...................................................................67

0x4F – WSS3 .....................................................................67

0x50 – FILLDATA ..............................................................67

0x51 – SDID.......................................................................67

0x52 – DID..........................................................................68

0x53 – WSS1 .....................................................................68

0x54 – WSS2 .....................................................................68

0x55 – VVBI .......................................................................69

0x56~6A LCTL6~LCTL26 .................................................69

0x6B – HSGEGIN ..............................................................70

0x6C – HSEND ..................................................................70

0x6D – OVSDLY................................................................70

0x6E – OVSEND................................................................70

0x6F – VBIDELAY .............................................................71

0x70 – ENCODER CONTROL1........................................71

0x71 – ENCODER CONTROL2........................................72

TECHWELL, INC.

REV. D

08/29/2005

TW9920

TW9920概述

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