SDA6000 Datasheet, PDF (293/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Display Generator
Table 10-1 Behavior of M2’s Outputs in Overlapped Layer Mode (cont’d)
Layer 1
Layer 2 Screen
BLANK COR RGB
Background Pin
Pin Pins
RGB
Tube
TR1 TR0 TR1 TR0 SBTL
1
0
1
X1
1
0
Back- Video
ground
1
1
1
X1
1
1
Back- Contrast
ground red. Video
*1) _{n.a. = not available}
*2) _{X = don’t care}
For transparency in ‘screen background area’ please refer to Chapter 10.3.3.
10.3.2 Embedded Layers
Layer 1 and 2 are not read in parallel to the RAM. The SRU reads only one layer at a
time. During the area of layer 2 only pixels of layer 2 are read. Otherwise only layer 1 is
read. As a result in the area of layer 2, the pixel information for layer 1 is not available.
This is why layer 2 is transparent to video and not to layer 1. As a result, in embedded
layer mode, transparency between layers is only supported layer-wise not pixel-wise.
Also please refer to transparency using overlapped layers (Chapter 10.3.1).
Users Manual
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2000-06-15