Abstract:
An arbitrator governs an arbitration between different power domains and sequences powering up the different power domains supplied by the same voltage supply (VS) circuit on the Chip, The arbitrator sequencing logic limits how many different power domains simultaneously power up to a maximum amount, which is less than enough instantaneous electrical current drawn on the VS-circuit to cause a reduction below a minimum allowable supply voltage level for the VS-circuit, The sequencing logic manages the sequencing of powering up the different power domains by factoring in i) whether different power domains arbitrating to power up are part of a set of power domains that share the VS-circuit, ii) an amount of an instantaneous eiectricai current drawn, and iii) an amount of credits available before the minimum allowable supply voltage level occurs for that VS-circuit. The sequencing logic controls behavior of power domains when powering up from multiple different behaviors.
Abstract:
Maintaining cache coherence in a System-on-a-Chip with both multiple cache coherent master IP cores (CCMs) and non-cache coherent master IP cores (NCMs). A plug-in cache coherence manager (CM), coherence logic in agents, and an interconnect are used for the SoC to provide a scalable cache coherence scheme that scales to an amount of CCMs in the SoC. The CCMs each includes at least one processor operatively coupled through the CM to at least one cache that stores data for that CCM. The CM maintains cache coherence responsive to a cache miss of a cache line on a first cache of the caches, then broadcasts a request for an instance of the data stored corresponding to cache miss of the cache line in the first cache. Each CCM maintains its own coherent cache and each NCM is configured to issue communication transactions into both coherent and non-coherent address spaces.
Abstract:
A method, apparatus, and system in which an integrated circuit comprises an initiator Intellectual Property (IP) core, a target IP core, an interconnect, and a tag and thread logic. The target IP core may include a memory coupled to the initiator IP core. Additionally, the interconnect can allow the integrated circuit to communicate transactions between one or more initiator Intellectual Property (IP) cores and one or more target IP cores coupled to the interconnect. A tag and thread logic can be configured to concurrently perform per-thread and per-tag memory access scheduling within a thread and across multiple threads such that the tag and thread logic manages tags and threads to allow for per-tag and per-thread scheduling of memory accesses requests from the initiator IP core out of order from an initial issue order of the memory accesses requests from the initiator IP core.
Abstract:
A method and apparatus for on-chip inter-network performance optimization using configurable performance parameters are described. The apparatus (fig.3) comprising configurable agents (A1) having and inputs and outputs coupled to receive internetwork communication (A, B, C) and cores (1, 2, and 3) having inputs and the inputs coupled to receive the configurable agents outputs.
Abstract:
In an embodiment, an operating point controller for two or more circuit regions in an integrated circuit is discussed. The OPC is configured to both i) set a resource state, including operating voltage and operating frequency, for each of those circuit regions, and ii) identify events to initiate transitions between two or more operating points for a given circuit region. The operating point controller is also configured to manage transitions between operating points for the two or more circuit regions on the integrated circuit. The operating point controller is a hardware based machine implemented in logic rather than software operating on a CPU processor.
Abstract:
Various methods and apparatus are described for communicating transactions between one or more initiator IP cores and one or more target IP cores coupled to an interconnect. A centralized Memory Management logic Unit (MMU) is located in the interconnect for virtualization and sharing of integrated circuit resources including target cores between the one or more initiator IP cores. A master translation look aside buffer (TLB) stores virtualization and sharing information in the entries of the master TLB. A set of two or more translation look aside buffers (TLBs) locally store virtualization and sharing information replicated from the master TLB. Logic in the MMU or other software updates the virtualization and sharing information replicated from the master TLB in the entries of one or more of the set of local TLBs.
Abstract:
Various methods and apparatus are described for communicating transactions between one or more initiator IP cores and one or more target IP cores coupled to an interconnect. Tag logic may be located within the interconnect, such as located in an agent, and configured to assign different interconnect tag identification numbers to two or more transactions from a same thread. The tag logic assigns different interconnect tag identification numbers to allow the two or more transactions from the same thread to be outstanding over the interconnect to two or more different target IP cores at the same time, allow the two or more transactions from the same thread to be processed in parallel over the interconnect, and potentially serviced out of issue order while being returned back to the multiple threaded initiator IP core realigned in expected execution order.