Internal Versus External Frame Syncs - Analog Devices ADSP-BF506F Hardware Reference Manual

Functional Description
Figure 19-9 illustrates framed serial transfers, which have these
characteristics:
• TFSR and RFSR bits in the SPORT_TCR1 and SPORT_RCR1
registers determine framed or unframed mode.
• Framed mode requires a framing signal for every word. Unframed
mode ignores a framing signal after the first word.
• Unframed mode is appropriate for continuous reception.
• Active low or active high frame syncs are selected with the
bits of the
LRFS
See "Timing Examples" on page 19-39
TSCLK
OR
RSCLK
TFS
OR
RFS
FRAMED
DATA
TFS
OR
RFS
UNFRAMED
DATA
DATA
Figure 19-9. Framed Versus Unframed Data

Internal Versus External Frame Syncs

Both transmit and receive frame syncs can be independently generated
internally or can be input from an external source. The ITFS and IRFS
bits of the SPORT_TCR1 and SPORT_RCR1 registers determine the
frame sync source.
19-32
and
SPORT_TCR1
B3 B2 B1 B0
B3 B2 B1 B0 B3
ADSP-BF50x Blackfin Processor Hardware Reference
registers.
SPORT_RCR1
for more timing examples.
B3 B2 B1
B2 B1 B0 B3
and
LTFS
B0
B2 B1