LSI Logic Confidential
Video Control Register
11-23
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
field data displayed on the first line of the window. This
bit should not be changed while an OSD transfer is active
or pending. This bit also applies to video data, if RGB
graphics data is being displayed in the video layer. This
bit or the Top bit should be set if GoOSD or VideoRGB
is set.
Top
5
If set, top field data is displayed in OSD windows. If set
at the same time as Bottom, data from each field is
displayed on alternate lines, with top field data displayed
on the first line of the window. This bit should not be
changed while an OSD transfer is active or pending. This
bit also applies to video data, if RGB graphics data is
being displayed in the video layer. This bit or Top bit
should be set if GoOSD or VideoRGB is set.
FlickE
4
If set when the GoOSD bit is set by microcode, the
associated OSD window will apply flicker filtering to
primary and secondary OSD data; otherwise, flicker
filtering will not be applied, and only primary OSD data is
displayed for that window. This bit should not be changed
while an OSD transfer is active or pending. This bit is
ignored when video is used as a graphics layer, or if both
Top and Bottom are set.
0
3
This bit must be programmed to 0.
OSDI
2
The completion of an OSD window generates an OSD
completion interrupt, if OSDInt is set. This bit should not
be changed while an output transfer is active or pending.
OQF
1
A read-only bit that is set when there are two outstanding
DMA transfers in the OSD output command queue. A
transfer is loaded into the queue each time the GoOSD
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.