SPORT Operation Modes
5-26 ADSP-21368 SHARC Processor Hardware Reference
serial bit stream occupies a separate channel. Each word belongs to the
next consecutive channel. For example, a 24-word block of data contains
one word for each of the 24 channels.
L
In previous SHARC processors, μ-law and A-law compres-
sion/decompression hardware companding was available on
transmitted and received words when the SPORT operated in
TDM mode. In the ADSP-21367/8/9 and ADSP-2137x processors
companding logic is available only in SPORT0, 2, 4, and 6 A chan-
nels and expansion logic is available only in SPORT1, 3, 5, and 7
A channels.
The SPORT can automatically select some words for particular channels
while ignoring others. Up to 128 channels are available for transmitting or
receiving or both. Each SPORT can receive or transmit data selectively
from any of the 128 channels.
Data companding and DMA transfers can also be used in multichannel
mode on channel A. Channel B can also be used in multichannel mode,
but companding is not available on this channel.
Figure 5-4. Word Select Timing in I
2
S Mode
SPORTX_CLK
SPORTX_FS/WS
LEFT-JUSTIFIED SAMPLE
PAIR MODE DATA OR
SPORTX _DA OR SP ORTX_DB
MS B
n
WORD N
LEFT CHANNEL
WORD N+1
RIGHT CHANNEL
LS B
n
MSB
n+1
WORD n-1
RIGHT CHANNEL
LSB
n-1
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