CC2400 Chipcon AS, CC2400 Datasheet - Page 35

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

Error detection
When the CRC-16 is enabled it will be
calculated based on the data field of the
packet, i.e. not including the preamble or
the
transmitting the packet the CRC-16 is
appended after the last data byte in the
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-16.
Chipcon AS
Use
Length
GRMDM register
configuration bits
Preamble bits
(1010...1010)
Packet field
32 bits
Figure 17. Packet format details (with recommended lengths of preamble and
synchronization
SmartRF
16/32 bits
Mandatory
≥ 1 byte
PRE_BYTES[2:0]
®
CC2400 PRELIMINARY Datasheet (rev. 1.1), 2003-10-02
Preamble
word.
Optional CRC-16 calculation
Table 7. Data packet format
Data f ield
8 x n bits
Optional 8/10 coding
synchronization word)
When
SYNC_WORD_SIZE[1:0]
Synchronisation word
1, 2, 3 or 4 bytes
Mandatory
SmartRF
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-16 polynomial is:
16 bits
Mandatory
Data field
≥ 1 byte
x
Legend:
16
®
Inserted automatically in TX,
processed and remov ed in RX.
Unprocessed user data
+ x
15
CC2400
+ x
2
+ 1
CRC_ON
Page 35 of 73
Optional
CRC-16
2 bytes