Texas Instruments SimpleLink CC2620 Technical Reference Manual page 1589

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Setting CC26xx
15
16
17
18
0, 19–31
If symbolRate.bPdifDecim is 1, the setting of RFC_MDM:DEMMISC3.PDIFDECIM is given by
symbolRate.pdifDecim. Otherwise, the setting is calculated automatically from the symbol rate and
bandwidth setting. This value is also used in calculation of other register settings.
The CMD_PROP_RADIO_DIV_SETUP command contains settings for frequency band and intermediate
frequency. The center frequency of the band to use is given by centerFreq, and used for calculating the
transmitter shaping filter and the TX IF. The divider to use in the synthesizer is given by loDivider. The
user must ensure that the setting is compatible with the given frequency. A value of 2 is only allowed for
devices supporting operation in the 2.4-GHz band. In the CMD_PROP_RADIO_SETUP command,
centerFreq defaults to 2432 MHz and loDivider defaults to 2.
For CMD_PROP_RADIO_DIV_SETUP, the intermediate frequency can be specified through the intFreq
parameter, which calculates the setting in the modem for TX and iswritten to the configuration parameter
area. If this parameter is 0x8000 and for CMD_PROP_RADIO_SETUP, a default intermediate frequency
as given in Table 23-148
The preamConf setting gives the preamble. The preamble is a sequence of 1010... or 0101..., where
preamConf.preamMode gives the first transmitted bit. For more than 16 bytes, only an even number of
bytes is supported. Setting preamConf.nPremBytes = 31 gives a 4-bit preamble.
The formatConf setting is used for various setup of the packet format. The sync word length is given by
nSwBits, which can be up to 32 bits. The bit polarity for FSK type modulation is given by bBitReversal,
which must be 1 for compatibility with CC1101. The bit ordering is given by bMsbFirst, where 1 gives
compatibility with the CC1101 device, and so forth. The whitenMode setting can select a whitener
scheme. Other whiteners are obtained using override settings. Details of the IEEE 802.15.4g settings are
given in Section 23.7.5.2.1. The fecMode setting can be used to change the encoding of the transmitted or
received signal. For long-range mode (fecMode = 8), the nSwBits setting and the sync word programmed
in the RX and TX commands are ignored, and a hard-coded 64-bit sync word with good performance is
used. The bDigitalAgc setting can change the default AGC algorithm for one that also uses adjusts gain in
digital portions of the radio.
The command sets up a 16-bit CRC with the polynomial x
compatible with the CC1101 device. Other polynomials, lengths, and initializations can be obtained by
parameter overrides.
The pRegOverride parameter gives a pointer to an override structure, just as the one given for
CMD_RADIO_SETUP. This parameter can be used for overriding parameters calculated from the other
settings in the commands, as well as other parameters. If the value is NULL, no overrides are used.
23.7.5.2.1 IEEE 802.15.4g Packet Format (CC13xx Only)
IEEE 802.15.4g PHY, including header, is supported by using the CMD_PROP_RX_ADV and
CMD_PROP_TX_ADV commands.
The radio is configured to IEEE 802.15.4g mode by setting the formatConf.whitenMode field to the values
4, 5, 6, or 7, and formatConf.bMsbFirst must be set to 1 using the CMD_PROP_RADIO_DIV_SETUP. For
the CMD_PROP_TX_ADV and CMD_PROP_RX_ADV commands, pktConf.bCrcIncSw and
pktConf.bCrcIncHdr must both be set to 0. For CMD_PROP_RX_ADV, hdrConf.numHdrBits must be set
to 16, hdrConf.lenPos must be set to 0, hdrConf.numLenBits must be set to 11, and lenOffset must be −4.
SWCU117C – February 2015 – Revised September 2015
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Table 23-148. Receiver Bandwidth Settings (continued)
Setting CC13xx
49
50
51
52
53–127
is used.
Copyright © 2015, Texas Instruments Incorporated
Receiver Bandwidth
2120 kHz
2800 kHz
3470 kHz
4240 kHz
Reserved
16 15 2
+ x + x + 1 and initialization of all 1s. This is
Proprietary Radio
Default Intermediate
Frequency
1 MHz
1 MHz
1 MHz
1 MHz
1589
Radio