LSI Logic Confidential
Video Control Register
11-13
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Hfpchr
7
If set when GoI, GoI2, GoR or GoO, the phase of chroma
pel filtering of the corresponding video capture, rescale or
output window is offset by half a pel relative to luma
filtering as required by MPEG-1 and H.261.
GoR
6
Set by microcode to begin horizontally rescaling a row
(multiple scan lines) of luma and/or chroma data supplied
by a row of scale(i) dsp instructions. The GoR bit remains
set until data in the rescale filter result range has been
rescaled, to allow software polling of completion. Clearing
this bit is ignored.
VidOutInt
5
The completion of a video output window will generate a
video output completion interrupt if VidOutInt is set. This
bit should not be changed while an output transfer is
active or pending.
Echo
4
This bit should always be 0. Set by microcode to queue
up a video input stream 1capture window that will be
inserted into the video output (without storing into
SDRAM) using the most recently stored values in the
input data vertical range register. Up to two video capture
commands can be outstanding at any time. The Echo bit
remains set while there is at least one video input capture
outstanding to allow software polling of completion. The
Echo bit must be set before the start of the capture
window, or a partial window may be echoed. Typically it
will be set from the video transfer interrupt handler.
Clearing this bit is ignored (use the stop bit instead).
Inside the capture window, data (including SAV
sequences) from the stream 1 video input pins with a
small delay replaces the video output or background color
unless there is an active PIP window or RLEalpha is set
which causes blending to occur in the RLE mixer. OSync
should be set and the video output clock, output total
samples per line and lines per picture (progressive) or
field (interlaced) must match the incoming video. The
input source should be programmed to shift its active
video earlier by the input to output delay. Note that Echo
and GoI can both be set time, to echo and capture input
data to SDRAM at the same. Echo windows can not be
Содержание DMN-8600
Страница 14: ...LSI Logic Confidential xiv Contents Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...
Страница 18: ...LSI Logic Confidential xviii Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...
Страница 64: ...LSI Logic Confidential 7 6 Memory Mapping Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...