Ic apparatus with coherency domains

Abstract

An integrated-circuit apparatus comprises a requestor node and a first plurality of coherency nodes configured to provide a distributed system-level cache, each coherency node being configured to provide system-level caching for a respective set of memory addresses allocated to the coherency node. The first plurality of coherency nodes, or a second plurality of coherency nodes, is configured to provide respective distributed local coherency caches for a set of local coherency domains, wherein each of the coherency nodes of the first or second plurality is configured to provide local coherency caching for a respective set of memory addresses allocated to the coherency node. The apparatus is configured to assign the requestor node and each coherency node to a respective local coherency domain of the set of local coherency domains. The requestor node is configured to send a first memory request to a coherency node, in a same local coherency domain as the requestor node, for local-coherency-cache lookup. The requestor node is further configured to send a second memory request to a coherency node, in a same local coherency domain as the requestor node, for system-level-cache lookup without first sending the second memory request to a coherency node for local-coherency-cache lookup.

Dependencies are inferred from the claim text.