AX8052F151 datasheet(40/51 Pages) ONSEMI

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Transceiver

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AX8052F151

HDLC Mode

Note: HDLC mode follows High-Level Data Link Control (HDLC, ISO 13239) protocol.

HDLC Mode is the main framing mode of the AX8052F151. In this mode, the AX8052F151

performs automatic packet delimiting, and optional packet correctness check by inserting and

checking a cyclic redundancy check (CRC) field.

The packet structure is given in the following table.

Flag

Address Control

Information

FCS

Flag

8 bit

8 or 16 bit

Variable length, 0 or more bits in multiples of 8

16 / 32 bit

8 bit

HDLC packets are delimited with flag sequences of content 0x7E.

In AX8052F151 the meaning of address and control is user defined. The Frame Check Sequence

(FCS) can be programmed to be CRC-CCITT, CRC-16 or CRC-32.

The receiver checks the CRC, the result can be retrieved from the FIFO, the CRC is appended to

the received data.

For details on implementing a HDLC communication see the AX5051 Programming Manual.

RAW Mode

In Raw mode, the AX8052F151 does not perform any packet delimiting or byte synchronization.

It simply serializes transmit bytes and de-serializes the received bit-stream and groups it into

bytes.

This mode is ideal for implementing legacy protocols in software.

RAW Mode with Preamble Match

Raw mode with preamble match is similar to raw mode. In this mode, however, the receiver does

not receive anything until it detects a user programmable bit pattern (called the preamble) in the

receive bit-stream. When it detects the preamble, it aligns the de-serialization to it.

The preamble can be between 4 and 32 bits long.

802.15.4 (ZigBee) DSSS

802.15.4 uses binary phase shift keying (PSK) with 300 kbit/s (868 MHz band) or 600 kbit/s (915

MHz band) on the radio. The usable bit rate is only a 15th of the radio bit rate, however. A

spreading function in the transmitter expands the user bit rate by a factor of 15, to make the

transmission more robust. The despreader function of the receiver undoes that.

In 802.15.4 mode, the AX8052F151 framing unit performs the spreading and despreading

function according to the 802.15.4 specification. In receive mode, the framing unit will also

automatically search for the 802.15.4 preamble, meaning that no interrupts will have to be

serviced by the microcontroller until a packet start is detected.

AX8052F151 Datasheet(PDF) 40 Page - ON Semiconductor

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