decaWave DW1000 - Page 146

DW1000 User Manual
© Decawave Ltd 2017
Version 2.12
Page 146 of 242
Table 22: Other possible SFD sequence configurations
Data
Rate
DWSFD
reg:1F:00
bit:17
TNSSFD
reg:1F:00
bit:20
RNSSFD
reg:1F:00
bit:21
SFD_LENGTH
reg:21:00
bits:0–7
Description
850 kbps
0
0
0
x
This programming selects the 8-symbol SFD as
defined in the IEEE 802.15.4 standard, when
operating at 850 kbps.
110 kbps
0
0
0
x
This programming selects the 64-symbol SFD as
defined in the IEEE 802.15.4 standard, when
operating at 110 kbps.
850 kbps
1
0
0
x
When the DW1000 is operating at 850 kbps, this
programming selects a Decawave defined non-
standard 8-symbol SFD, which is stronger than
the standard defined SFD but still a little weaker
that the data. Hence our recommendation of
the 16-symbol SFD defined Table 21 for best
performance at 850 kbps.
6.8 Mbps
or
850 kbps
0
1
1
8 to 16
When the DW1000 is operating at 6.8 Mbps or
850 kbps, this programming selects the use of a
user configured SFD with length configurable in
the range 8 to 16 symbols. In this mode the user
is responsible for correctly programming the SFD
sequence in Register file: 0x21 – User defined
SFD sequence.
110 kbps
0
1
1
x
When the DW1000 is operating at 110 kbps, this
selects the use of a user configured SFD with
fixed length of 64 symbols. In this mode the user
is responsible for correctly programming the SFD
sequence in Register file: 0x21 – User defined
SFD sequence.
Note: Configurations other than those defined in Table 21 or Table 22 are not recommended. To correctly
receive a frame the receiver must use the same SFD sequence configuration as is being used by the remote
transmitting device.
for details of the optimum selection of SFD sequence.