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參數(shù)資料
| 型號： | FUSION878A |
| 廠商： | CONEXANT SYSTEMS |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP128 |
| 封裝： | PLASTIC, QFP-128 |
| 文件頁數(shù)： | 90/180頁 |
| 文件大?。?/td> | 2067K |
| 代理商： | FUSION878A |
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1.0 Product Overview
Fusion 878A
1.2 Detailed Features
PCI Video Decoder
1-6
Conexant
100600B
1.2.8 PCI Bus Interface
The Fusion 878A is designed to efficiently utilize the available 132 Mbps PCI
bus. The 32-bit DWORDs are output on the PCI bus with the appropriate image
data under the control of the DMA channels. The video stream consumes bus
bandwidth with average data rates varying from 44 Mbps for full size 768 x 576
PAL RGB32, to 4.6 Mbps for NTSC CIF 320 x 240 RGB16, to 0.14 Mbps for
NTSC ICON 80 x 60 8-bit mode.
The pixel instruction stream for the DMA channels consumes a minimum of
0.1 Mbps. The Fusion 878A provides the means for handling the bandwidth
bottlenecks caused by slow targets and long bus access latencies that can occur in
some system configurations. To overcome these system bottlenecks, the Fusion
878A gracefully degrades and recovers from FIFO overruns to the nearest pixel in
real time.
1.2.9 UltraLock
The Fusion 878A employs a proprietary technique known as UltraLock to lock to
the incoming analog video signal. It always generates the required number of
pixels per line from an analog source in which line length can vary by as much as
a few microseconds. UltraLock’s digital locking circuitry enables the
VideoStream decoders to lock on to video signals quickly and accurately,
regardless of their source. Since the technique is completely digital, UltraLock
can recognize unstable signals caused by VCR head switches or any other
deviation and adapt the locking mechanism to accommodate the source.
UltraLock uses nonlinear techniques that are difficult, if not impossible, to
implement in genlock systems. And unlike linear techniques, it adapts the locking
mechanism automatically.
1.2.10 Scaling and Cropping
The Fusion 878A can reduce the video image size in both horizontal and vertical
directions independently, using arbitrarily selected scaling ratios. The X and Y
dimensions can be scaled down to one-sixteenth of the full resolution. Horizontal
scaling is implemented with a 6-tap interpolation filter, while up to 5-tap
interpolation is used for vertical scaling with a line store.
The video image can be arbitrarily cropped by reducing the number of active
scan lines and active horizontal pixels per line.
The Fusion 878A supports a temporal decimation feature that reduces video
bandwidth. This is accomplished by allowing frames or fields to be dropped from
a video sequence at fixed but arbitrarily selected intervals.
1.2.11 Input Interface
Analog video signals are input to the Fusion 878A via a four-input multiplexer.
The multiplexer can select between four composite source inputs or between three
composite and a single S-Video input source. When an S-Video source is input to
the Fusion 878A, the luma component is fed through the input analog multiplexer,
and the chroma component feeds directly into the C input pin. An AGC circuit
enables the Fusion 878A to compensate for non-standard amplitudes in the analog
signal input.
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