SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
The DMA_SYSTEM supports two graphic acceleration features: transparent copy and constant fill.
Only one of these features can be enabled at a time through the DMA4_CCRi register for the particular logical DMA channel.
The transparent copy feature enables specification of a particular color through the DMA4_COLORi register so that when it is recognized in the data from the source, it is not copied to the corresponding location in the destination but instead leaves the data in the corresponding location in the destination as it is.
Figure 16-11 shows the 2-D graphic transparent color block diagram.
The constant fill feature provides the ability to specify a particular color through the DMA4_COLORi register for every specified location in the destination. In this case, the transfer consists only of writing to the destination without reading from a source.
Both features support 8, 16, and 24 bpp, depending on what is specified as the DMA transfer ES through the DMA4_CSDPi register. An ES of 32 bits corresponds to 24 bpp. During a 32-bit (24 bpp) transfer, the 8 most-significant bits (MSBs) ([31:24]) are 0. Both features are compatible with packed and burst transactions.