Analog Devices ADSP-SC58 Series Hardware Reference Manual page 874

Table 18-13: 8-Bit Receive Mode with Packing Enabled (Continued)
Pin Data (8 bits) DMA DATA
SKIPEN=0
SKIPEO =X
SWAPEN=0
SIGNEXT=X
0xCC 0xCCBB AA99
0xDD
0xEE
0xFF
0x00 0x00FF EEDD
If EPPI_CTL.PACKEN=0, the DMA is a 16-bit DMA and the EPPI either sign-extends or zero-fills the bytes of
incoming data into a 16-bit word. The EPPI_CTL.SWAPEN bit has no effect if EPPI_CTL.PACKEN=0.
Table 18-14: 8-Bit Receive Mode with Packing Disabled
Pin Data (8 bits)
0x44
0x55
0x66
0x77
0x88
0x99
0xAA
0xBB
Configuring 10/12/14-Bit Receive Modes
For 10, 12, or 14-bit non-split receive modes, the EPPI first either zero-fills or sign-extends the incoming data into a
16-bit word. The action depends on the setting of the EPPI_CTL.SIGNEXT bit. If EPPI_CTL.PACKEN =1,
the EPPI then packs two of these words into one 32-bit word. Alternate even or odd samples can be skipped based
on the EPPI_CTL.SKIPEN and EPPI_CTL.SKIPEO bits. The first incoming data can be placed either in the
least significant bit positions or in the most significant bit positions, based on the EPPI_CTL.SWAPEN bit setting.
ADSP-SC58x/ADSP-2158x SHARC+ Processor Hardware Reference
DMA DATA
SKIPEN=0
SKIPEO=X
SWAPEN=1
SIGNEXT=X
0x99AA BBCC
0xDDE EFF00
DMA DATA DMA DATA
SKIPEN=0 SKIPEN=0
SKIPEO=X SKIPEO=X
SWAPEN=X SWAPEN=X
SIGNEXT=0 SIGNEXT=1
0x0044 0x0044
0x0055 0x0055
0x0066 0x0066
0x0077 0x0077
0x0088 0xFF88
0x0099 0xFF99
0x00AA 0xFFAA
0x00BB 0xFFBB
DMA DATA DMA DATA
SKIPEN=1 SKIPEN=1
SKIPEO=1 SKIPEO=0
SWAPEN=0 SWAPEN=0
SIGNEXT=X SIGNEXT=X
0xFFDD BB99
0x00EE CCAA
DMA DATA
SKIPEN=1
SKIPEO=1
SWAPEN=X
SIGNEXT=0
0x0044
0x0066
0x0088
0x00AA
EPPI Mode Configuration
DMA DATA DMA DATA
SKIPEN=1 SKIPEN=1
SKIPEO=1 SKIPEO=0
SWAPEN=1 SWAPEN=1
SIGNEXT=X SIGNEXT=X
0x99BB DDFF
0xAACC EE00
DMA DATA
SKIPEN=1
SKIPEO=0
SWAPEN=X
SIGNEXT=1
0x0055
0x0077
0xFF99
0xFFBB
18–35