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參數(shù)資料
| 型號： | SAA7140A |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | High Performance Scaler HPS |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP128 |
| 文件頁數(shù)： | 22/68頁 |
| 文件大小： | 432K |
| 代理商： | SAA7140A |
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1996 Sep 04
22
Philips Semiconductors
Objective specification
High Performance Scaler (HPS)
SAA7140A; SAA7140B
7.2
Acquisition control
The processing window for the scaling unit is defined in the
acquisition control unit. An internal counter receives
I
2
C-bus controlled values for offset (bits XO10 to XO0 and
YO10 to YO0) and length (bits XS10 to XS0 and
YS10 to YS0). The counter is reset by the corresponding
sync reference input signal. The horizontal counter
increments in qualified pixels and the vertical counter
increments in qualified lines, i.e. lines containing at least
one qualified pixel. Depending on the selected mode, the
source for the horizontal reference may be HREF (DMSD
port) or HIN (expansion port), or for the vertical reference,
VS (DMSD port) or VIN (expansion port).
It should be noted that in order to avoid programming
dependent line and field drop effects, all values must not
exceed the number of qualified pixels per line or lines per
field.
Fig.12 Reference signals for scaling window.
(1) LQ = qualified lines i.e. lines containing at least one qualified pixel.
handbook, full pagewidth
VIN/VS
PXQV
HGTV
LQ
(1)
ACTIVE VIDEO WINDOW
SCALING WINDOW
xs
line
ys
yo
xo
field/
frame
output signals
PXQ/CREF
HIN/HREF
MHA119
7.3
BCS control
The parameters for Brightness, Contrast and Saturation
(BSC) can be adjusted in the BSC control unit.
The luminance signal can be controlled via the I
2
C-bus
using bits BRIG7 to BRIG0 and CONT6 to CONT0.
For the brightness control:
00H = minimum offset
80H = nominal level
FFH = maximum offset.
For the contrast control:
00H = luminance off
40H = nominal gain of 1.01
7FH = maximum gain of 1.9999.
The chrominance signal can be controlled via the I
2
C-bus
using bits SAT6 to SAT0.
For the saturation control:
00H = colour off
40H = nominal gain of 1.0
7FH = maximum gain of 1.9999.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA7140B | High Performance Scaler HPS |
| SAA7146AHZ | Circular Connector; No. of Contacts:66; Series:MS27472; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:18; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:18-35 RoHS Compliant: No |
| SAA7146AH | .012UF/400VDC METAL POLY CAP |
| SAA7146A | Multimedia bridge, high performance Scaler and PCI circuit SPCI |
| SAA7151 | Digital multistandard colour decoder with SCART interface DMSD2-SCART |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7140B | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:High Performance Scaler HPS |
| SAA7144HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Quadruple video input processor |
| SAA7145 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:PCI Multimedia Bridge |
| SAA7146 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| SAA7146A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multimedia bridge, high performance Scaler and PCI circuit SPCI |
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