Method and apparatus for decoding Manchester encoded data

Details Method and apparatus for decoding Manchester encoded data Method and apparatus for decoding Manchester encoded data

1991-11-21

1992-11-10

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

341 70, 360 44, H04L 2722

Patent

active

051630672

ABSTRACT:
A receiver for Manchester encoded data includes an autocalibration feedback loop that generates a timing pulse used to recover the clock and data signals. The autocalibration feedback loop includes a first digital delay line sampled by a plurality of D-type flip-flops in dependence upon the recovered clock signal to produce a control word CNT(O:N) indicative of the number of digital delay elements required to approximate one-half of the recovered clock period. A second digital delay line, connectivity mapped to the first, provides three-eights of a clock period delay. The delayed clock signal is derived from the bit stream by sampling in dependence upon the timing pulse. The decoded data signal is derived from the bit stream by multiplexing the sampling input in dependence upon the timing pulse and the decoded data signal.

REFERENCES:
patent: 4317211 (1982-02-01), Quesnell, Jr.
patent: 4361895 (1982-11-01), Khoudari
patent: 4688232 (1987-08-01), Fox

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