Hewlett-packard Development Company, L.P.

Mark A Shaw

Stuart C Haden

Brian Matthew Johnson

David Glen Edwards

Mark Edward Shaw

Rangaswamy Arumugham

Brad O Underwood

Kevin A Egan

D Glen Edwards

Stuart Haden

To provide fault-tolerant, spread spectrum clock signals, a plurality of processing modules having respective spread spectrum control circuits are provided. Clock signals of redundant clock sources are provided to the plurality of processing modules. Failover control logic selects a corresponding one of the clock signals from the redundant clock sources for use in each of the processing modules. Frequency spreading is applied to the corresponding selected clock signal in each of at least some of the plurality of processing module.

Providing fault-tolerant spread spectrum clock signals in a system

Apparatus for configuring input/output signal levels of interfacing logic circuits operating at different voltage levels comprises: a logic circuit for operating at a first voltage level; a bank of input/output gates coupled to the logic circuit for interfacing input/output signals at a second voltage level, different from the first voltage level, to the logic circuit, the bank of gates including a port for setting the operational voltage level thereof; and a control circuit coupled to the port and governed by a control signal to configure the operational voltage level of the bank of gates to render the logic circuit and the interfacing input/output signals voltage level compatible.

Apparatus for configuring I/O signal levels of interfacing logic circuits

A system comprises plural electronic modules, at least one interconnect structure and plural power supplies. The electronic modules communicate over the interconnect structure. The system further comprises plural redundant manager modules to perform management tasks with respect to the at least one interconnect structure and the power supplies.

Redundant manager modules to perform management tasks with respect to an interconnect structure and power supplies

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Sachse, TX, United States of America

Mark A Shaw