Intel Corporation

Eran Tamari

Debendra Das Sharma

David J Harriman

Robert G Blankenship

Mahesh U Wagh

Mark B Rosenbluth

Jasmin Ajanovic

Scott Dion Rodgers

Anil Vasudevan

Prashant Sethi

Ilan Pardo

Sridhar Muthrasanallur

Ajay V Bhatt

James E Akiyama

Doron Shamia

Peter J Barry

Eliezer Weissmann

Ohad Falik

Blaise B Fanning

Mikal Hunsaker

Sridhar Lakshmanamurthy

Michael T Klinglesmith

Robert P Adler

Joseph Murray

Abraham Mendelson

Avi Mendelson

Rohit R Verma

Kar Leong Wong

Avi (Abraham) Mendelson

Ohad Fallk

Ellezer Weissmann

Avi (Arraham) Mendelson

In one embodiment, a system-on-chip (SoC) can be configured to receive a request from a master agent in a fabric coupled to the master agent, send a show command grant to the master agent responsive to selection of the request by the fabric, receive a command portion of a transaction corresponding to the request in the fabric and determine a target agent to receive the transaction based on the command portion, and thereafter send a transaction grant to the master agent for the transaction. Other embodiments are described and claimed.

Providing multiple decode options for a system-on-chip (SoC) fabric

A method and apparatus for enhancing/extending a serial point-to-point interconnect architecture, such as Peripheral Component Interconnect Express (PCIe) is herein described. Temporal and locality caching hints and prefetching hints are provided to improve system wide caching and prefetching. Message codes for atomic operations to arbitrate ownership between system devices/resources are included to allow efficient access/ownership of shared data. Loose transaction ordering provided for while maintaining corresponding transaction priority to memory locations to ensure data integrity and efficient memory access. Active power sub-states and setting thereof is included to allow for more efficient power management. And, caching of device local memory in a host address space, as well as caching of system memory in a device local memory address space is provided for to improve bandwidth and latency for memory accesses.

Atomic operations in PCI express

In one embodiment, the present invention includes a method for receiving a request for a transaction from a first agent in a fabric and obtaining an address, a requester identifier, a tag, and a traffic class of the transaction, and determining a channel of a target agent to receive the transaction based on at least two of the address, the requester identifier, the tag, and the traffic class. Based on this channel determination, the transaction can be sent to the channel of the target agent. Other embodiments are described and claimed.

Supporting multiple channels of a single interface

Transaction layer packet formatting

According to one embodiment, a system on a chip includes multiple agents each corresponding to an intellectual property (IP) logic and a fabric to couple the agents. The fabric can include a primary message interface and a sideband message interface. The fabric further includes one or more routers to provide out-of-band communications between the agents via this sideband message interface. To effect such communication, the router can perform a subset of ordering rules of a personal computer (PC)-based specification for sideband messages. Other embodiments are described and claimed.

Providing a sideband message interface for system on a chip (SoC)

In one embodiment, the present invention includes method for entering a credit initialization state of an agent state machine of an agent coupled to a fabric to initialize credits in a transaction credit tracker of the fabric. This tracker tracks credits for transaction queues of a first channel of the agent for a given transaction type. The agent may then assert a credit initialization signal to cause credits to be stored in the transaction credit tracker corresponding to the number of the transaction queues of the first channel of the agent for the first transaction type. Other embodiments are described and claimed.

Common idle state, active state and credit management for an interface

PCI express transaction descriptor

In one embodiment, a method includes determining whether producer-consumer ordering rules have been met for a first transaction to be sent from a source agent to a target agent via a fabric, and if so a first request for the first transaction is sent from the source agent to the fabric in a first clock cycle. Then a second request can be sent from the source agent to the fabric for a second transaction in a pipelined manner. Other embodiments are described and claimed.

Issuing requests to a fabric

Transaction re-ordering

Prefectching in PCI express

Atomic operations

Growing community of inventors

Ramat Gan, Israel

Eran Tamari