Multichannel Operation - Analog Devices ADSP-21261 SHARC Hardware Reference Manual

SPORT Operation Modes
SPORTX_CLK
SPORTX_FS/WS
LEFT-JUSTIFI ED SAMPLE
PAIR MODE DATA OR
SPORTX_DA OR SPORTX_DB
Figure 9-4. Word Select Timing in I

Multichannel Operation

The serial ports offer a multichannel mode of operation, which allows the
SPORT to communicate in a Time Division Multiplexed (TDM) serial
system. In multichannel communications, each data word of the serial bit
stream occupies a separate channel. Each word belongs to the next consec-
utive channel. For example, a 24-word block of data contains one word
for each of the 24 channels.
The serial port 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.
9-24
LSB n-1 MSB n
WORD n-1
RIGHT CHANNEL
ADSP-2126x SHARC Processor Hardware Reference
LSB n
WORD n
LEFT CHANNEL
2
S Mode
MSB n+1
WO RD n+1
RIGHT CHANNEL