RF63 datasheet(50/91 Pages) ETC2

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ADVANCED COMMUNICATIONS & SENSING

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RF63

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The length stored in this register relates only to the payload which includes the message and the optional address

byte. In this mode, the payload must contain at least one byte, i.e. address or message byte.

An illustration of a fixed length packet is shown in Figure 43. It contains the following fields:

•

Preamble (1010...).

•

Sync word (Network ID).

•

Optional Address byte (Node ID).

•

Message data.

•

Optional 2-bytes CRC checksum.

Optional DC free data coding

CRC checksum calculation

Preamble

1 to 4 bytes

Sync Word

1 to 4 bytes

Address

byte

Message

0 to (FIFO size) bytes

CRC

2-bytes

Payload/FIFO

Fields added by the packet handler in Tx and processed and removed in Rx

Optional User provided fields which are part of the payload

Message part of the payload

Figure 43: Fixed Length Packet Format

5.5.2.2. Variable Length Packet Format

This mode is necessary in applications where the length of the packet is not known in advance and can vary over

time. It is then necessary for the transmitter to send the length information together with each packet in order for

the receiver to operate properly.

In this mode the length of the payload, indicated by the length byte in Figure 44, is given by the first byte of the

FIFO and is limited only by the width of the FIFO selected. Note that the length byte itself is not included in its

calculation. In this mode, the payload must contain at least 2 bytes, i.e. length + address or message byte.

An illustration of a variable length packet is shown in Figure 44. It contains the following fields:

•

Preamble (1010...).

•

Sync word (Network ID).

•

Length byte

•

Optional Address byte (Node ID).

•

Message data.

•

Optional 2-bytes CRC checksum.

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