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SPRS457E
– MARCH 2009 – REVISED JUNE 2011
Programmable width, height, and base starting coordinates for each window
External memory address and offset registers for each window
Support for x2 and x4 zoom in both the horizontal and vertical direction
Pixel-level blending/transparency/blinking attributes can be defined for OSDWIN0 when OSDWIN1 is
configured as an attribute window for OSDWIN0.
Support for blinking intervals to the attribute window
Ability to select either field/frame mode for the windows (interlaced/progressive)
An eight step blending process between the bitmap and video windows
Transparency support for the bitmap and video data (when a bitmap pixel is zero, there will be no
blending for that corresponding video pixel)
Ability to resize from VGA to NTSC/PAL (640x480 to 720x576) for both the OSD and video windows
Horizontal rescaling x1.5 is supported
Support for a rectangular cursor window and a programmable background color selection.
The width, height, and color of the cursor is selectable
The display priority is: Rectangular-Cursor
> OSDWIN1 > OSDWIN0 > VIDWIN1 > VIDWIN0 >
background color
Support for attenuation of the YCbCr values for the REC601 standard.
The following restrictions exist in the OSD module.
If the vertical resize filter is enabled for either of the video windows, the maximum horizontal window
dimension cannot be greater than 1024 currently. This is due to the limitation in the size of the line
memory.
It is not possible to use both of the CLUT ROMs at the same time. However, a window can use RAM
while another uses ROM.
Table 6-50 lists the On-Screen Display (OSD) registers, their corresponding acronyms, and the device
memory locations (offsets).
Table 6-50. On-Screen Display (OSD) Registers
Offset
Acronym
Register Description
0h
MODE
OSD Mode Setup
4h
VIDWINMD
Video Window Mode Setup
8h
OSDWIN0MD
Bitmap Window 0 Mode Setup
Ch
OSDWIN1MD
OSD Window 1 Mode Setup
(when used as a second OSD window)
Ch
OSDATRMD
OSD Attribute Window Mode Setup
(when used as an attribute window)
10h
RECTCUR
Rectangular Cursor Setup
14h
RSV0
Reserved
18h
VIDWIN0OFST
Video Window 0 Offset
1Ch
VIDWIN1OFST
Video Window 1 Offset
20h
OSDWIN0OFST
Bitmap Window 0 Offset
24h
OSDWIN1OFST
Bitmap Window 1/Attribute Window Offset
28h
VIDWINADH
Video Window 0/1 Address - High
2Ch
VIDWIN0ADL
Video Window 0 Address - Low
30h
VIDWIN1ADL
Video Window 1 Address - Low
34h
OSDWINADH
BMP Window 0/1 Address - High
38h
OSDWIN0ADL
BMP Window 0 Address - Low
3Ch
OSDWIN1ADL
Bitmap Window 1/Attribute Address - Low
40h
BASEPX
Base Pixel X
Copyright
2009–2011, Texas Instruments Incorporated
Peripheral Information and Electrical Specifications
139