CC2400 Chipcon AS, CC2400 Datasheet - Page 34

• Manufacturer Part Number: CC2400
• Description: 2.4 GHz RF Transceiver
• Manufacturer: Chipcon AS

Packet Handling Hardware Support
The
for packet oriented radio protocols.
The
support can in transmit mode be used to
construct the data packet:
In receive mode the packet handling
support can be used to de-construct the
data packet:
The packet handling support can be
combined with the 8/10 line encoding
scheme. The 8/10 coding will apply to the
data field (FIFO data) of the packet only
(and CRC).
In
detection
detection can be used to mute DCLK until
a valid sync word is received.
Data packet format
The format of the data packet can be
configured,
following items:
See Table 7 and Figure 17 for details.
The preamble pattern is ‘(0)101010…’.
The first bit in the preamble is always the
same as the first bit in the synchronization
word. The length of the preamble is
programmable,
recommended length is 4 bytes. If GFSK
modulation is used at 1 Mbps, Chipcon
recommends using a preamble length of
32 bytes.
Chipcon AS
•
•
•
•
•
•
•
•
•
•
un-buffered
CC2400
buffered
Add a programmable number of
preamble bytes
Add a synchronization word
Compute and add a CRC-16
computed over the data field
Preamble detection
Synchronization word detection
Compute and check the received
CRC-16
Preamble
Synchronization word
Data
CRC-16
and
has built-in hardware support
and
SmartRF
mode
mode
synchronization
can
the
®
CC2400 PRELIMINARY Datasheet (rev. 1.1), 2003-10-02
packet
consist
the
default
preamble
handling
of
word
and
the
SmartRF
* Should not be used if packet reception is to be
used. Use to terminate infinite transmission (111).
The length of the synchronization word is
programmable as shown below.
The
programmable in the SYNCL and SYNCH
registers. The default (and recommended)
synchronization word length is 32 bits,
which gives high immunity against false
synchronization word indication. If lower
immunity can be accepted, one can
reduce the length to 16 bits. (However,
using 8 bits will typically give too many
false synchronization word indications.)
A threshold on the number of bits in error
when receiving the synchronization word
can
GRMDM.SYNC_ERRBITS_ALLOWED[1:0]
in the range 0 – 3. (A threshold of 0 is
default.)
GRMDM.
PRE_BYTES[2:0]
GRMDM.
SYNC_WORD_SIZE
[1:0]
000
001
010
011
100
101
110
111
synchronization
00
01
10
11
be
®
Infinitely until TX
GRMDM.PRE_BYTES
[2:0] is set to 000
programmed
Number of bytes
CC2400
Number of bits
(8 bits)
16
32
0*
1
2
4
8
16
24
32
8
word
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