SDA6000 Datasheet, PDF (302/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Display Generator
10.5
Initialization of Memory Transfers
Transferring an input format of the source area to an output format in the destination area
is supported by different transfer modes. For this, a pixel modification unit and CLUT1 of
the GA is used. CLUT1 has a size of 256 × 16 bit.
Next to the transfer mode the transfer areas (source and destination) must be defined
by GA instructions. Source is either an address in the external memory or a constant
value coming from CLUT1. Destination is always an address in the external memory.
Constant values coming from CLUT1 are used to draw lines or fill parallelograms.
DG
GA
SRU
Pixel
Modification
CLUT1
(256 x 16)
Display Generator Interface (DGI)
Memory
UED11184
Figure 10-15 Overview of GA
10.5.1 Transfer Modes
Different transfer modes are available. The table below shows all possible combinations
of input and output formats.
‘Transparency available’ means that if transparency mode is chosen (see also GAI-
instruction ‘TAR’ (Bit: TRM)) and Bit TR1 of the output word is set to ‘0’ (refer also to
Figure 10-12) this pixel is written to the destination, otherwise this pixel is not written to
the destination.
‘Modification’ describes in which way the output information is generated by using the
input information, CLUT1 and the settings of the ‘TAR’-instruction. Using 16-bit TTX
output two bits are replaced by another 2 bits (Flash) which are also defined by graphic
accelerator instruction ‘TAR’. The table below shows all possible combinations of input
and output formats:
Users Manual
10 - 17
2000-06-15