Analog Devices ADSP-BF535 Blackfin Hardware Reference Manual page 507

The pin is always driven (not three-stated) if the SPORT is enabled
DT
( = in the
TSPEN 1
mode and an inactive time slot occurs.
In multichannel mode,
ated internally by the SPORT, and it is used for both transmit and receive
functions. Leave
channel mode. If
internally distributed to both the receiver and transmitter circuitry.

The SPORT Multichannel Transmit Select register and the
SPORT Multichannel Receive Select register must be programmed
before enabling
important in DMA data unpacked mode, since SPORT FIFO
operation begins immediately after
enabled and depends on the values of these registers. Enable
before enabling
Figure 11-34 shows example timing for a multichannel transfer (for exam-
ple, receive on channels 0 and 2, and transmit on channels 1 and 2).
Multichannel transfer has these characteristics:
• Uses TDM method where serial data is sent or received on differ-
ent channels sharing the same serial bus.
• Can independently select transmit and receive channels.
• signals start of frame.
RFS
• is used as "Transmit Data Valid" for external logic, true only
TFS
during transmit channels.
See "Timing Examples" on page 11-69
ADSP-BF535 Blackfin Processor Hardware Reference
SPORTx_TX_CONFIG
can either be provided externally or gener-
RSCLK
disconnected if the SPORT is used only in multi-
TSCLK
is externally or internally provided, it will be
RSCLK
SPORTx_TX/SPORTx_RX
or
SPORTx_TX
Serial Port Controllers
register), unless it is in multichannel
operation. This is especially
SPORTx_TX/SPORTx_RX
operation.
SPORTx_RX
for more timing examples.
is
MCM_EN
11-61