ax5031 AXSEM, ax5031 Datasheet - Page 22

• Manufacturer Part Number: ax5031
• Description: Datasheet Ax5031
• Manufacturer: AXSEM

22
Note: HDLC mode follows High-Level Data Link Control (HDLC, ISO 13239) protocol.
Circuit Description
HDLC Mode
HDLC Mode is the main framing mode of the AX5031. In this mode, the
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
8 bit
HDLC packets are delimited with flag sequences of content 0x7E.
In
(FCS) can be programmed to be CRC-CCITT, CRC-16 or CRC-32.
For details on implementing a HDLC communication see the
RAW Mode
In Raw mode, the
simply serialises transmit bytes.
This mode is ideal for implementing legacy protocols in software.
802.15.4 (ZigBee)
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 15
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
specification.
Version 1.3
AX5031
Address
8 bit
the meaning of address and control is user defined. The Frame Check Sequence
8 or 16 bit
Control
AX5031
AX5031
does not perform any packet delimiting or byte synchronization. It
Information
Variable length, 0 or more bits in multiples of 8
framing unit performs the spreading according to the 802.15.4
th
of the radio bit rate, however. A
AX5031
FCS
16 / 32 bit
Programming Manual.
AX5031
Datasheet AX5031
(Optional Flag)
8 bit
performs