SDA6000 Datasheet, PDF (305/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Display Generator
Table 10-5 Supported Transfer Modes (cont’d)
TMOD Input Output Transparency Modification
(4 … 0) Format Format Available
10100 8-bit
data
8-bit data No
OUT(7 … 0) = IN(7 … 0)
Others Reserved
Note: There is no transfer mode defined which uses the 2-bit format as an output format,
because in this case layer 2 is restricted to a width of 64 pixels. If the 2-bit format
is required, the direct byte by byte transfer can be used.
10.5.2 Transfer Areas
Next to the transfer mode the transfer area has to be defined by graphic accelerator
instructions (GAI). For source and destination, ‘linear’ and ‘rectangle’ areas can be
defined.
‘Linear’ means that data is accessed byte by byte without any irregularity in the
addressing of the memory.
‘Rectangle’ means that after the access of n bytes defined by a parameter ‘width’ an
‘offset’ to the last address is automatically added. This feature can be used if an array of
data has to be copied from one memory location into another (bigger) array at any other
memory location. The linear addressing is a subset of the rectangle addressing scheme
if ‘offset’ is set to ‘0’.
Source Area
There are different settings necessary to define the source area. These settings are
done by using the graphic accelerator instruction set. The table below describes the
necessary settings and corresponding GAIs with the affected bit position inside the GAI:
Used GAI
SDR
TSR
TOR
Bit Position Inside
GAI
S_ADDR
WIDTH_IN
S_OFFSET
Description
Start address of source area
Width of source area
Offset to describe rectangular source
areas
Users Manual
10 - 20
2000-06-15