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SERIAL CONTROL MODULE: HDLC
Data encoding
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between the opening and closing flags, except for the inserted zeroes, to the
receiver data buffer.
Last byte bit
pattern table
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Data encoding
The HDLC module provides several types of data encoding:
Normal NRZ
NRZI
Biphase-Level (Manchester)
Biphase-Space (FM0)
Biphase-Mark (FM1)
Encoding
examples
This figure shows examples of the data encoding types.
In NRZI, Biphase-Space and Biphase-Mark, the signal level does not convey
information. The placement of the transitions determine the data.
In Biphase-Level, the polarity of the transmission determines the data.
Last byte bit pattern Valid data
bbbbbbb0 7
bbbbbb01 6
bbbbb011 5
bbbb0111 4
bbb01111 3
bb011111 2
b0111111 1