Analog Devices ADSP-SC58 Series Hardware Reference Manual page 843

EPPI Functional Description
Table 18-2: ADSP-SC58x EPPI Interrupt List (Continued)
Interrupt Name
ID
216 EPPI0_CH1_DMA_ERR
ADSP-SC58x EPPI Trigger List
Table 18-3: ADSP-SC58x EPPI Trigger List Masters
Trigger ID Name
62 EPPI0_CH0_DMA
63 EPPI0_CH1_DMA
Table 18-4: ADSP-SC58x EPPI Trigger List Slaves
Trigger ID Name
46 EPPI0_CH0_DMA
47 EPPI0_CH1_DMA
RGB Data Formats
For transmit modes, the EPPI can convert RGB888 data in memory to RGB666 at the output when the
EPPI_CTL.RGBFMTEN bit is set and the EPPI_CTL.DLEN value is equal to 18 bits. Similarly, the EPPI can
convert RGB888 data in memory to RGB565 at the output when the EPPI_CTL.RGBFMTEN bit is set and
EPPI_CTL.DLEN is equal to 16 bits.
This conversion is performed as follows:
• If EPPI_CTL.PACKEN =1, the EPPI first unpacks according to the EPPI_CTL.SWAPEN bit setting, and
the three 32-bit data words from the DMA are broken into four 24-bit data words to be transmitted out, as
described earlier.
• If EPPI_CTL.PACKEN =0, the EPPI takes the lower 24 bits of the 32-bit DMA as the data to be transmit-
ted. Then, the EPPI truncates this 24-bit data word to the required data width. It removes the lower 2 bits of G
and the lower 2 bits or 3 bits of R and B.
Data Clipping
The EPPI contains two registers to define the lower and upper limits for the Luma and Chroma components. It uses
these registers for clipping data values during 8-bit, 10-bit, 12-bit or 16-bit transmit modes. All data values for odd
samples which are less than the value in the EPPI_ODDCLIP.LOWODD bit field are replaced with the value in the
EPPI_ODDCLIP.LOWODD field. All data values for even samples which are less than the value in the
EPPI_EVENCLIP.LOWEVEN field are replaced with the value in the EPPI_EVENCLIP.LOWEVEN field.
18–4
Description
EPPI0 DMA Channel 1 Error
Description
EPPI0 Channel 0 DMA
EPPI0 Channel 1 DMA
Description
EPPI0 Channel 0 DMA
EPPI0 Channel 1 DMA
ADSP-SC58x/ADSP-2158x SHARC+ Processor Hardware Reference
Sensitivity DMA
Channel
Sensitivity
Edge
Edge
Sensitivity
Pulse
Pulse