Scalable, common reference-clocking architecture using a separate, single clock source for blade and rack servers
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United States of America Patent
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Feb 16, 2016
Grant Date -
Nov 21, 2013
app pub date -
Mar 7, 2012
filing date -
Mar 7, 2012
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Abstract
Scalable, common reference-clocking architecture and method for blade and rack servers. A common reference clock source is configured to provide synchronized clock input signals to a plurality of blades in a blade server or servers in a rack server. The reference clock signals are then used for clock operations related to serial interconnect links between blades and/or servers, such as QuickPath Interconnect (QPI) links or PCIe links. The serial interconnect links may be routed via electrical or optical cables between blades or servers. The common reference clock input and inter-blade or inter-server interconnect scheme is scalable, such that the plurality of blades or servers can be linked together in communication. Moreover, when QPI links are used, coherent memory transactions across blades or servers are provided, enabling fine grained parallelism to be used for parallel processing applications.
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