saa6703ah NXP Semiconductors, saa6703ah Datasheet - Page 67
saa6703ah
Manufacturer Part Number
saa6703ah
Description
Xga Analog Input Flat Panel Controller.
Manufacturer
NXP Semiconductors
Datasheet
1.SAA6703AH.pdf
(97 pages)
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Philips Semiconductors
7.13.2
The OSD bitmap part can be used for displaying pixel
based multicolour graphics along with the regular text
based OSM (see Fig.22). Its display position can be
defined anywhere in the picture (OSDB_PX and
OSDB_PY) and like the OSD text it can be zoomed, flipped
and rotated according to the settings within its control
register OSDB_CTRL0. It is allowed to overlap with a
displayed OSD text window if desired. In this event the
bitmap_behind flag (OSDB_CTRL0[6]) defines whether
the bitmap part appears on top or behind the OSD text
information. Two separate alpha-blending values
(bg_alpha and fg_alpha) define a blending value for the
OSD bitmap and separate transparent flags provide the
Table 46 Bitmap RAM configurations; note 1
Note
1. X = don’t care.
2004 Apr 01
handbook, full pagewidth
XGA analog input flat panel controller
CODE
BPP
1X
00
01
OSD
OSDB_PY
BITMAP
USED BITS
PER PIXEL
1
2
4
OSDB_PX
COLOURS
OSDB_SX (= 12)
USED
16
2
4
Fig.22 OSD bitmap structure.
DISPLAYABLE
67
PIXELS
32768
16384
8192
possibility to define either the foreground or the
background from transparent to solid. The display colours
are again defined on a separate osd_bitmap palette inside
the osd_colour definition page 9 so each pixel can use one
of the defined 16 colours where bitmap colour 0 is always
treated as background. The OSD bitmap uses an internal
memory of 4 kbyte RAM in which the graphic pixels are
stored (see Table 46). It can be parametrized freely in
width (OSDB_SX), height (OSDB_SY) and colour depth
(OSDB_CTRL1[6:5], bits per pixel) with the restriction that
the needed memory size still fits into the 4 kbyte memory
address space.
256
256
256
128; 181
64; 128
32; 90
EXAMPLE WINDOW SIZES
(NOT ZOOMED)
picture
90
128
MHC229
181
SAA6703AH
Product specification
OSDB_SY
(= 11)
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