CC2400_07 Datasheet, PDF (30/83 Pages) Texas Instruments – 2.4 GHz Low-Power RF Transceiver

CC2400
data field, i.e. when the FIFO becomes
empty.
When a packet is being received the CRC
is calculated as the data is read out of the
FIFO. When all data is read, the next two
bytes in the FIFO are the CRC.
If the reception of the packet is error free,
the PKTSTATUS.CRC_OK flag is set (also
available on the GIO1 and GIO6 pins).
The CRC polynomial is:
x¹⁶ + x¹⁵ + x² + 1
Packet field
Use
Length
GRMDM register
configuration bits
Preamble
Mandatory
≥ 1 byte
PRE_BYTES[2:0]
Synchronisation word
Mandatory
1, 2, 3 or 4 bytes
SYNC_WORD_SIZE[1:0]
Table 16. Data packet format
Data field
Mandatory
≥ 1 byte
CRC
Optional
2 bytes
CRC_ON
Preamble bits
(1010...1010)
Optional 8/10 coding
Optional CRC-16 calculation
Data f ield
Legend:
Inserted automatically in TX,
processed and remov ed in RX.
Unprocessed user data
32 bits
16/32 bits
8 x n bits
16 bits
Figure 11. Packet format details (with recommended lengths of preamble and
synchronization word)
SWRS042A
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