Analog Devices adsp-2100 Manual page 121

5 Serial Ports
Figures 5.14 and 5.15 show the receive operation with normal framing and
alternate framing, respectively, in the unframed mode. There is a single
the frame sync signal that occurs only at the start of the first word, either
one SCLK before the first bit (normal) or at the same time as the first bit
(alternate). This mode is appropriate for multiword bursts (continuous
reception).
SCLK
TFS
DT
SPORT Control Register:
Internal Frame Sync
External Frame Sync
Figure 5.20 SPORT Transmit, Unframed Mode, Normal Framing
SCLK
TFS
DT
SPORT Control Register:
Internal Frame Sync
External Frame Sync
Note: There is an asynchronous delay between TFS input and DT. See the appropriate
data sheet for specifications.
Figure 5.21 SPORT Transmit, Unframed Mode, Alternate Framing
5 – 22
B3 B2 B1
0XXX 001X 0XXX 0011
0XXX 000X 0XXX 0011
B3 B2 B1
0XXX 011X 0XXX 0011
0XXX 010X 0XXX 0011
B0 B3 B2
B0 B3 B2
B1 B0 B3
B1 B0 B3
B2
B2