Pmc-sierra, Inc.

Graham B Smith

Charles Kevin Huscroft

Brian D Gerson

Vernon Robert Little

John Richard Bradshaw

A user network interface device for interfacing between synchronous optical network (SONET)/synchronous digital hierarchy (SDH) which is characterized by a continuous stream of frames of data and an asynchronous transfer mode (ATM) characterized by a non-continuous stream of cells of data. The user network interface device includes an integral phase lock loop circuit to recover clock and data from an encoded incoming stream of data. In another embodiment, the network interface device synthesizes a high speed transmit clock from a low frequency reference source.

Integrated user network interface device for interfacing between a sonet network and an ATM network

A design protection circuit for a logic circuit comprised of a counter for receiving clock pulses with the logic circuit and apparatus for resetting the logic circuit upon the counter counting a predetermined number of clock pulses, the predetermined number being higher than a highest number of clock pulses required by the logic circuit for carrying out a simulated logical function.

Method for protecting an ASIC by resetting it after a predetermined time

A method of generating output clock pulses using a phase locked loop which includes a voltage controlled oscillator (VCO) is comprised of providing a sequence of data pulses and a sequence of reference clock pulses, resetting the phase locked loop to force the VCO to its lowest operating frequency, releasing reset of the phase locked loop and forcing the VCO to lock to a multiple of the frequency of the reference clock pulses, detecting the presence of data pulse transitions, in the event of detection of data pulse transitions, forcing the VCO to lock to the data pulses, and outputting output clock pulses from the phase locked loop.

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Burnaby, Canada

Graham B Smith