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參數(shù)資料
| 型號： | TW9903 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | TW9903 ? Multi-standard Video Decoder With High Quality Down Scaler |
| 中文描述： | TW9903？多標準視頻解碼器，高品質(zhì)下倍線器 |
| 文件頁數(shù)： | 22/74頁 |
| 文件大?。?/td> | 630K |
| 代理商： | TW9903 |
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TW9903
TECHWELL, INC.
22
REV. 0.92 ( B )
06/02/2002
Following is an example using pixel ratio to determine the horizontal scaling ratio. These equations
should be used to determine the scaling ratio to be written into the 12-bit HSCALE register
assuming HACTIVE is programmed with 720 active pixels per line:
NTSC:
HSCALE = [720/N
pixel_desired
] * 256
HSCALE = [(720/N
pixel_desired)
] * 256
PAL:
Where:
N
pixel_desired
is the nominal number of pixel per line.
For example, to output a CCIR601 compatible NTSC stream at SIF resolution, the HSCALE value
can be found as:
HSCALE = [(720/320)] * 256 = 576 = 0x0240
However, to output a SQ compatible NTSC stream at SIF resolution, the HSCALE value should be
found as:
HSCALE = [(640/320)] * 256 = 512 = 0x200
In this case, with total resolution of 768 per line, the HACTIVE should have a value of 640.
The vertical scaling determines the number of vertical lines output by the TW9903. The vertical
scaling register (VSCALE) is a 12-bit register, which is the concatenation of a 4-bit register
SCALE_HI and an 8bit register VSCALE_LO. The maximum scaling ratio is 16:1. Following
equations should be used to determine the scaling ratio to be written into the 12-bit VSCALE
register assuming VACTIVE is programmed with 240 or 288 active lines per field.
60Hz system:
VSCALE = [240/ N
line_desired]
* 256
50Hz system:
VSCALE = [288/
N
line_desired]
* 256
Where: N
line_desired is
the number of active lines output per field.
The scaling ratios for some popular formats are listed in Table 4.
TW9903 Cropping
Cropping allows only subsection of a video image to be output. The VACTIVE signal can be
programmed to indicate the number of active lines to be displayed in a video field, and the
HACTIVE signal can be programmed to indicate the number of active pixels to be displayed in a
video line. The start of the field or frame in the vertical direction is indicated by the leading edge of
VSYNC. The start of the line in the horizontal direction is indicated by the leading edge of the
HSYNC. The start of the active lines from vertical sync edge is indicated by the VDELAY register.
The start of the active pixels from the horizontal edge is indicated by the HDELAY register. The
sizes and location of the active video are determined by HDELAY, HACTIVE, VDELAY, and
VACTIVE registers. These registers are 8-bit wide, the lower 8-bits is, respectively, in
HDELAY_LO, HACTIVE_LO, VDELAY_LO, and VACTIVE_LO. Their upper 2-bit shares the same
register CROP_HI.
The Horizontal delay register (HDELAY) determines the number of pixels delay between the
leading edge of HSYNC and the leading edge of the HACTIVE. Note that this value is referenced
to the unscaled pixel number. The Horizontal active register (HACTIVE) determines the number of
active pixels to be output or scaled after the delay from the sync edge is met. This value is also
referenced to the unscaled pixel number. Therefore, if the scaling ratio is changed, the active video
region used for scaling remain unchanged as set by the HACTIVE register, but the valid pixels
output are equal or reduced due to down scaling. In order for the cropping to work properly, the
following equation should be satisfied.
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| TW9903-FB | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| TW9903-MB | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| TW9903-MBS | 功能描述:IC NTSC/PAL/SECAM DECODR 100PQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| TW9905-FD | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| TW9905-MD | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
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