LSI Logic Confidential
11-8
Video Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
two taps of the last chroma output line, otherwise the first
chroma input line of the next window will be used for the
last tap of the last chroma output line. If VCL is not set,
then software must load the next input window before the
last chroma output line is reached. VCL must be set
when VCD is set and this is the last window in the current
field/frame or the next window in the current field/frame
has VCD clear. If VCP is clear or FRC is set when GoI is
set, this bit is ignored.
ITS
26
If set when GoI is set by software, then the associated
capture window will compute inverse telecine statistics. If
clear, then inverse telecine statistics are not computed. If
TF is also clear, accesses are not performed to the pre-
vious field buffer in SDRAM.
IQF2
25
A read-only bit which is set when there are two outstand-
ing DMA transfers in the video input stream 2 command
queue. A transfer is loaded into the queue each time the
GoI2 bit is set by software. A command is removed from
the queue each time the transfer completes. This bit can
be used by software to poll for when to load the next
command. Polling is typically used for short transfers
(<10 microseconds) and interrupts are used for longer
transfers.
VCD
24
If set when GoI is set by software, then the associated
capture window will vertically decimate the chroma output
of the horizontal input filter from 422 to 420 format. If
clear, then the associated capture window will not
vertically decimate chroma data. If set when GoO is set
by software, then the associated output window will
vertically interpolate the chroma output of the horizontal
output filter from 420 to 422 format. If clear, then the
associated output window will not vertically interpolate
chroma data. When VCD is set, the associated input or
output window must have an even number of lines. VCI
must be set when VCD is set and this is the first window
in the current field/frame or the previous window in the
current field/frame had VCD clear. VCL must be set when
VCD is set and this is the last window in the current