Register file: 0x27 – Digital receiver configuration, sub-register 0x02 is a 16-bit tuning register. For optimal
performance the value here needs to change depending on the data rate and depending on whether the SFD
sequence is configured to be the IEEE 802.15.4 UWB standard compliant SFD sequence, or the higher
performing non-standard SFD configuration. The values needed are given in Table 30 below. Please take
care not to write other values to this register as doing so may cause the DW1000 to malfunction.
Table 30: Sub-Register 0x27:02 – DRX_TUNE0b values
Value to program to
Sub-Register 0x27:02 –
DRX_TUNE0b
Note: Please refer to Table 21: Recommended SFD sequence configurations for best performance
SFD_LENGTH
reg:21:00
bits:0–7
When the DW1000 is operating at 6.8 Mbps, this
programming selects the standard IEEE 8-symbol
SFD which gives sufficient robustness since the
data is already the weakest part of the frame.
The standard IEEE 8-symbol SFD is weaker than
data at 850 kbps. When the DW1000 is operating
at 850 kbps, this programming selects a Decawave
defined non-standard 16-symbol SFD, which
removes the weakness making the SFD stronger
than the 850 kbps data.
This programming selects a Decawave defined
non-standard 64-symbol SFD which is more robust
than standard IEEE 64-symbol SFD improving the
performance in 110 kbps mode.
Table 22 below presents additional SFD sequence programming options. Note: The selection of SFD
sequences other than the IEEE 802.15.4-2011 UWB standard compliant SFD sequence may improve
performance, but will of course make it impossible to interwork with a device configured to use the standard
defined SFD (or with a third party devices using the standard SFD).
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