Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
2007-02-20
2007-02-20
Nguyen, Chau T. (Department: 2616)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S516000, C375S372000
Reexamination Certificate
active
10223572
ABSTRACT:
A digital communications system that can asynchronously map/de-map digital signals from one clock domain to another, while reducing mapping jitter levels and permitting higher levels of integration. The digital communications system includes an asynchronous stuff bit insertion circuit, an asynchronous stuff bit removal circuit, and a communications network connected therebetween. The asynchronous stuff bit insertion circuit includes a first elastic store, a barrel shifter, and a stuffing circuit. The asynchronous stuff bit removal circuit includes a de-stuffing circuit, a second elastic store, and a frequency control path including a phase-locked loop having a variable divider circuit, the operation of which is controlled based on the presence/absence of stuff bits in the data provided to the de-stuffing circuit. By employing the first elastic store for temporary gross data frame storage and the barrel shifter for temporary fine data frame storage to reduce the number of gates in the asynchronous stuff bit insertion circuit, integration levels are increased. Further, by employing the frequency control path in the asynchronous stuff bit removal circuit to recover the clock signal of the first clock domain, mapping jitter levels in the digital communications system are reduced.
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Campeau Sean
Quirk Jay
Walker Timothy P.
Applied Micro Circuits Corporation
Cho Hong Sol
Nguyen Chau T.
Weingarten Schurgin, Gagnebin & Lebovici LLP
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