LSI Logic Confidential
11-2
Video Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Two programmable rectangular windows are captured from each field
without software intervention, allowing for VITC and closed caption
capture. Additional windows can be captured by loading a new capture
window in to the input channel at the completion of each window.
In a multiple DMN-8600 system, each chip will capture the video region
it requires. 8-bit values are passed through an 8-tap, 8-phase horizontal
filter for resampling and noise reduction. Double buffered luma and
chroma buffers are used to hold the filtered values. The DMA transfer
captures up to an entire field between video interrupts. Luma and chroma
information are stored separately in SDRAM using the DMN-8600 tiled
image data format.
The video input channel can convert from 4:2:2 to 4:2:0 on the fly using
a 3-tap filter with software specified coefficients. Frame or field filtering
is supported. The video input channel can also perform on-the-fly color
correction with software specified coefficients and luma and chroma
temporal filtering. This combined with 4:2:2 to 4:2:0 conversion
eliminates the need for chroma preprocessing and eliminates the need
for loading previous data and storing current data in luma preprocessing.
The DMN-8600 computes statistics during capture, including DC
measurements, horizontal activities for strips and same-parity IT
detection scores.
The input horizontal filter can be used to perform one or two pass
horizontal scaling of result data from the scale(i) instructions. Extra luma
and chroma input buffers are used for data coming from the DSP, and
extra chroma and luma filter output buffers are used as SDRAM data
buffers. When decimating data, the filter processes an average of the
scaling ratio input pels (up to 2 pels) per clock. When interpolating, the
8-tap filter is split into two 4-tap filters.
shows the data flow for the video output port. The output port
outputs 8-bit video data to ITU-R 656 or low-cost encoder chips such as
the SAA7125 and Bt856. Two programmable rectangular windows are
output for each field without software intervention. Additional data
windows can be output by loading new data windows into the output
channel at the completion of each window.
Содержание DMN-8600
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