CC2400-RTR1 datasheet(30/83 Pages) TI

30 / 83 page

CC2400

SWRS042A

Page 30 of 83

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:

16 + x15 + x2 + 1

Packet field

Preamble

Synchronisation word

Data field

CRC

Use

Mandatory

Optional

Length

≥ 1 byte

1, 2, 3 or 4 bytes

≥ 1 byte

2 bytes

GRMDM register

configuration bits

PRE_BYTES[2:0]

SYNC_WORD_SIZE[1:0]

CRC_ON

Table 16. Data packet format

Figure 11. Packet format details (with recommended lengths of preamble and

synchronization word)

Preamble bits

(1010...1010)

Data f ield

Optional CRC-16 calculation

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

Optional 8/10 coding

CC2400-RTR1 数据表(PDF) 30 Page - Texas Instruments

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