US Patent 7478255 Clock distribution in multi-cell computing systems

Embodiments of the invention relate to distribution of clocks to CPUs in processing cells of a multi-cell system. In an embodiment, each cell includes an interface, referred to as an agent. A plurality of interfaces, referred to as switches, together with the agents of the cells, connects the cells together. A clock source provides a clock to a switch, which replicates the clock and provides the replicated clocks to its ports. Each port of the switch, receiving a replicated clock, encodes this replicated clock and sends it over a link to each agent of a cell. Each agent of the cells, receiving an encoded clock, decodes this encoded clock, resulting in a decoded, or an extracted, clock. The agent then replicates the extracted clock and provides the replicates of the extracted clock to a plurality of CPUs of the cell. As a result, CPUs in all cells of the system receive clocks that all are synchronized to the clock provided by the clock source. Other embodiments are also disclosed including using the extracted clock as phase information, scaling, redundancy, etc.