Analog Devices SHARC ADSP-2136 Series Hardware Reference Manual page 201


SPORTs are paired when multichannel mode is selected. In this
mode, transmit/receive directions are fixed where SPORTS 0, 2,
and 4 act as transmitters, and SPORTs 1, 3, and 5 act as receivers.
Transmit Valid Signals
The ,
SPORT0_FS
signals, which are active during transmission of an enabled word. Because
the serial port's
three-stated when the time slot is not active, the
signal specifies if
SPORT4_FS
being driven by the processor.
In multichannel mode, the
signal is renamed
SPORT2_FS
. These signals become outputs in this mode.
TDV45

Do not connect
( ) to
TDV45
tion between the transmit data valid and multichannel frame sync
signals results.
After the
TXSPxA
,
SPORT0_FS SPORT2_FS/SPORT4_FS
DMA is used, this may occur several cycles after the multichannel trans-
mission is enabled. If a deterministic start time is required, pre-load the
transmit buffer.
Figure 6-7 shows an example of timing for a multichannel transfer with
SPORT pairing. The transfer has the following characteristics:
• The transfer uses the TDM method where serial data is sent or
received on different channels while sharing the same serial data
bus.
• The
SPORT1_FS
channel pairing.
ADSP-2136x SHARC Processor Hardware Reference
www.BDTIC.com/ADI
for the ADSP-21362/3/4/5/6 Processors
or
SPORT2_FS SPORT4_FS
,
SPORT0_DA/B SPORT2_DA/B
SPORT0_DA/B
SPORT0_FS
TDV23
(
SPORT0_FS
in multichannel mode because bus conten-
SPORT5_FS
transmit buffer is loaded, transmission begins and the
signals are generated. When serial port
signals the start of a frame for SPORT01 multi-
are used as a transmit data valid
and
SPORT4_DA/B
SPORT0_FS
,
SPORT2_DA/B
signal is renamed
and the
SPORT4_FS
) to
TDV01 SPORT1_FS
Serial Ports
signals are
, ,
SPORT2_FS
, is
SPORT4_DA/B
, the
TDV01
signal is renamed
, and
SPORT4_FS
6-43