Clock recovery and decoder circuit for a CMI-encoded signal

Details Clock recovery and decoder circuit for a CMI-encoded signal Clock recovery and decoder circuit for a CMI-encoded signal

1991-04-01

1993-03-16

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

375 95, H04L 702

Patent

active

051951100

ABSTRACT:
A method and digital circuit for decoding and recovering a data clock from an incoming stream of Coded Marked Inversion (CMI) encoded data. The CMI encoded data is applied to a shift register where the data is sampled at a rate greater than the incoming transfer rate thus providing multiple samples per data period. The multiple samples having a high logical value occuring during the first half of a data period are counted and a represented value is outputted. The multiple samples having a high logical value occurring during the second half of the data period are also counted and a second represented value is outputted. The two represented values are compared and a single CMI-decoded data bit is determined. The multiple samples are also compared to detect a high-to-low transition which, according to the CMI format, constitutes a data boundary. First and second free-running counters are provided, whose most significant output bits provide an initial clock signal and a recovered data clock, respectively. Upon each boundary detection occurring within a predetermined region, the first free-running counter is reset to an initial count and thereby resynchronized with the incoming stream of data. The initial and terminal counts of the second counter are adjusted by a phase controller to keep the recovered data clock phase-locked to the initial clock signal.

REFERENCES:
patent: 3593160 (1971-07-01), Moore
patent: 4242755 (1980-12-01), Giauzan
patent: 4317211 (1982-02-01), Quesnell, Jr.
patent: 4562422 (1985-12-01), Pospischil
patent: 4651328 (1987-03-01), den Hollander et al.
patent: 4740998 (1988-04-01), House
patent: 4761635 (1988-02-01), Arnaune et al.
patent: 4787097 (1988-11-01), Rizzo
patent: 4808970 (1989-02-01), Arnaune
patent: 4823363 (1989-04-01), Yoshida
patent: 4837782 (1989-06-01), Sasaki
patent: 4873524 (1989-10-01), Akkermans
patent: 5038351 (1991-08-01), Sakai et al.

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