SDA6000 Datasheet, PDF (309/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Display Generator
Meaning of Double Width and Double Height during Transfer
The destination area can be stretched horizontally and vertically by using GA instruction
TAR.
If double width (TDW) is set to ‘1’, the graphic accelerator writes each pixel twice
horizontally to the destination area.
TQH
0
0
1
TDH
0
1
X
Meaning
Normal transfer
If double height (TDH) is set to ‘1’ and quadruple height (TQH) is set
to ‘0’ in the destination output side each pixel in vertical direction is
repeated twice.
If quadruple height (TQH) is set to ‘1’ on the destination output side
each pixel in vertical direction is repeated four times.
If double height (TDH) is set to ‘1’ in the destination output side each pixel in vertical
direction is repeated twice.
For example: If double width is set to ‘1’ and quadruple height is set to ‘1’ each pixel of
the source area needs 8 pixels of the destination area.
Note: Parameters like WIDTH_OUT, WIDTH_CLIP, HEIGHT_OUT and HEIGHT_CLIP
are still pixel related. WIDTH_OUT, HEIGHT_OUT and D_OFFSET have to be
adapted by the software to get a complete character. Clipping is not affected by
TDH and TDW.
The following table is an example of a 1-bit bitmap (30 × 50) which should be transferred
either in normal size or in double size to an 8 bit output format in a frame buffer with a
size of 100 × 200 pixels.
Parameters
WIDTH_L1
HEIGHT_L1
WIDTH_IN
WIDTH_OUT
D_OFFSET
HEIGHT_OUT
TDW = 0; TDH = 0; TQH = 0 TDW = 1; TDH = 1; TQH = 0
100
200
30
30
60
70
40
50
100
Note: In case of double width transfer WIDTH_OUT has to be an even number. In case
of double/quad height transfer HEIGHT_OUT has to be an even/divisable by 4
number.
Users Manual
10 - 24
2000-06-15