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Input Capture
The Input Capture block is responsible for extracting valid data from the input data stream and
creating the required synchronization signals required by the data pipeline. This block also
provides stable timing when no stable input timing exists.
The selected input data stream is cropped using a programmable input capture window. Only
data within the programmable window is allowed through the data pipeline for subsequent
processing. Data that lies outside of the window is ignored.
Figure 8-11 Input Capture Window
Input cropping is required in a video system since video signals are normally over scanned.
For a flat panel TV, in order to over scan the image, a smaller portion of the input image needs
to be selected and then expanded to fill the entire screen.
Input data streams originating from CCIR656 sources are cropped with reference to the start
and end of active video flags encoded into the data stream. For all other inputs, the Input
Capture Window is referenced with respect to Horizontal and Vertical Sync.
CONFIDENTIAL – DO NOT COPY
Page 7-12
File No. SG-0219
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