Cabletron Systems, Inc.

Top Layer Networks, Inc.

Scott William Nolan

Nigel T Poole

Barry A Spinney

Richard L Szmauz

Joseph H Brown, Iv

Ronald Salett

A process and system for flexibly switching connections of data packet flows between nodes of data processing system networks by dividing data packets into cells and logically linking these cells on multiple queues of linked pointer lists.

System and process for flexible queuing of data packets in network switching

An apparatus and method for receiving time skewed data from a parallel data bus. A data transfer on the parallel data bus is preceded by a start-of-cell delimiter consisting of a predetermined sequence of pulses on each of the data signals. The data is received from the bus by receive logic employing a local clock. Sampling logic is used to sample each of the data signals received from the bus at a rate which is higher than the local clock rate. Sample registers store a plurality of samples of corresponding data signals, the number of samples stored being large enough to store at least some of the pulses constituting the start-of-cell delimiter. Start-of-cell detect and center select logic is used for determining that a start-of-cell delimiter is stored in each of the sample registers, and for determining which of the samples stored in each of the sample registers represents the approximate center sample of one of the pulses of the start-of-cell delimiter. These center samples correspond to the data signals on the bus, but are de-skewed and synchronous with the local clock.

Method and apparatus for recovery of time skewed data on a parallel bus

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Milford, MA, United States of America

Scott William Nolan