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EPPI Mode Configuration
Table 18-27: 16-bit Split Receive Mode with SPLTWRD = 1, SKIPEN = 0 and SWAPEN = 0 (Continued)
Pin Data
SPLTEO=1
(16 bits)
SUBSPLTODD=0
SWAPEN=0
SKIPEN=0
SKIPEO=X
DMACFG=1
Primary
DMA
Channel
U
Y
0
1
V
Y
1
2
U
Y
Y
Y
Y
Y
1
3
3
2
1
V
Y
2
4
U
Y
2
5
V
Y
3
6
U
Y
Y
Y
Y
Y
3
7
7
6
5
V
Y
4
8
Configuring 8-Bit Transmit Mode
For 8-bit non-split transmit mode, if the EPPI_CTL.PACKEN bit =1, the DMA is a 32-bit DMA and the EPPI
unpacks the 32-bit word from memory into 4 bytes to transmit. The EPPI transmits either the MSBs or the LSBs as
the first data, depending on the EPPI_CTL.SWAPEN bit setting. If EPPI_CTL.PACKEN =0, the DMA is a 16-
bit DMA and the EPPI transmits the lower 8 bits. The EPPI_CTL.SWAPEN bit has no effect when
EPPI_CTL.PACKEN =0.
Table 18-28: 8-bit Transmit Mode with Packing Enabled
DMA Data (32 bits)
0x11223344
0x55667788
18–44
Secondary
DMA
Channel
U
V
U
V
0
1
1
0
0
U
V
U
V
4
3
3
2
2
Pin Data when SWAPEN=0
0x44
0x33
0x22
0x11
0x88
0x77
0x66
ADSP-SC58x/ADSP-2158x SHARC+ Processor Hardware Reference
SPLT_EVEN_ODD=1
SUBSPLTODD=1
SWAPEN=0
SKIPEN=0
SKIPEO=X
DMACFG=0
DMACFG=1
Primary
Primary
DMA
DMA
Channel
Channel
Y
Y
Y
Y
Y
Y
Y
Y
3
2
1
0
3
2
1
U
V
U
V
1
1
0
0
Y
Y
Y
Y
Y
Y
Y
Y
7
6
5
4
7
6
5
U
V
U
V
3
3
2
2
Secondary
DMA
Channel
0
V
V
V
V
3
2
1
0
U
U
U
U
4
3
2
1
0
Pin Data when SWAPEN=1
0x11
0x22
0x33
0x44
0x55
0x66
0x77
DMACFG=0
Primary
DMA
Channel
Y
Y
Y
Y
3
2
1
0
V
V
V
V
3
2
1
0
Y
Y
Y
Y
7
6
5
4
U
U
U
U
3
2
1
0
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