AX-ConfigurationUtility User Manual
24
8.
Framing Panel
Figure 6: Framing panel for AXM0F343
Framing mode
:
Options are HDLC, Raw Pattern Match and PN9 Compatibility. In Raw Pattern Match mode
an arbitrary SYNC WORD of up to 32 bit marks the beginning of a frame. For legacy
systems the PN9 Compatibility mode implements PN9 data whitening in software, based
on the AX5043’s Raw Pattern Match mode.
Preamble:
•
Recommended default settings are chosen according to the selected modulation,
encoding and precision of the reference clock.
•
Specify the length of the preamble in bits, as well as one byte character which will
be repeated length/8 times.
•
The preamble character is always sent MSB first, irrespective of the “send MSB
first” option in the DATA chunk.
See comment on that option below.
•
If length is not an integer multiple of 8, the fractional byte is sent last, e.g. for
length = 33 bits the preamble character is sent 4 times followed by once the MSB
of the preamble character.
•
The “unencoded” option
causes the preamble character to bypass the Manchester,
scrambler, differential and inversion encoder. (See footnote to SYNC WORD for
technical details about inversion.)
•
In Wake on Radio mode an additional WOR preamble length (in ms) can be
specified. This chunk is transmitted in addition to the number of bits specified
above. The length of this chunk should not be shorter than the WOR period.
