CC2400 Datasheet, PDF (32/84 Pages) Texas Instruments – 2.4 GHz Low-Power RF Transceiver

CC2400
If 8/10 coding is selected when using the
packet mode support, it should be noted
that the preamble and the sync words are
not encoded.
24.2 Data encoding in un-buffered
mode
When data buffering is not used, but the
DIO/DCLK interface, the CC2400 can be
configured for two different data formats:
Synchronous NRZ mode. In transmit
mode CC2400 provides the data clock at
DCLK, and DIO is used as data input.
Data is clocked into CC2400 at the rising
edge of DCLK. The data is modulated at
RF without encoding. In receive mode
CC2400 does the synchronization and
provides received data clock at DCLK and
data at DIO. The data should be clocked
Transmitter side:
DCLK
DIO
“RF”
into the interfacing circuit at the rising
edge of DCLK. See Figure 12.
Synchronous Manchester encoded mode.
In transmit mode CC2400 provides the data
clock at DCLK, and DIO is used as data
input. Data is clocked into CC2400 at the
rising edge of DCLK and should be in NRZ
format. The data is modulated at RF with
Manchester code. The encoding is done
by CC2400. In this mode the effective bit
rate is half the baud rate due to the
coding. This limits the maximum bit rate to
500 kbps. In receive mode CC2400 does
the synchronization and provides received
data clock at DCLK and data at DIO.
CC2400 does the decoding and NRZ data
is presented at DIO. The data should be
clocked into the interfacing circuit at the
rising edge of DCLK. See Figure 13.
Clock provided by
CC2400
Data provided by microcontroller (NRZ)
FSK modulating signal (NRZ),
internal in CC2400
Receiver side:
“RF”
DCLK
DIO
Demodulated signal (NRZ),
internal in CC2400
Clock provided by
CC2400
Data provided by CC2400 (NRZ)
Figure 12. Synchronous NRZ mode
SWRS042A
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