US 6,557,087 B1 · Management of PCI read access to a central resource

Abstract

A PCI read access management system and method to manage read access between two agents providing PCI read requests to conduct contiguous read operations to a central resource at a PCI bus. Dual transaction control logic units are each respectively coupled to a separate one of the agents. An arbitration request connection couples the dual transaction control logic units. A PCI read request by one of the agents (e.g., agent A), and recognized by one of the dual transaction control logic units (e.g., unit 1), is signaled to the arbitration request connection, which arbitrates between the transaction control logic units for reserving the PCI bus for the one agent (agent A), and the one transaction control logic unit (unit 1) provides read access to the PCI bus for the one agent (agent A) for the contiguous read operations. The one transaction control logic unit (unit 1) then maintains the reservation until completion of the contiguous read operations.

Claims21

Dependent claims

In a PCI bus system having at least one PCI bus, a method for managing access to the same PCI bus for a PCI read between two agents, said agents providing PCI read requests to conduct contiguous read operations to a central resource at said same PCI bus, said managemtn conducted at dual transaction control logic units having an arbitration request connection coupling said dual transaction control logic units, comprising the steps of:

upon recognition of a request from one of said agents for said PCI read, arbitrating, at said arbitration request connection coupling said dual transaction control logic units, between said PCI read requests to said same PCI bus, reserving said same PCI bus for said one agent for said read request;
granting said read access to said same PCI bus for said one agent for said contiguous read operations;
and
maintaining said reservation for said one agent at said arbitration request connection until completion of said contiguous read operations.

1 more element

In a PCI bus system having at least one PCI bus, a PCI read access management system for managing read access between two agents providing PCI read requests to conduct contiguous read operations to a central resource at the same PCI bus, comprising:

dual transaction control logic units, each respectively coupled to a separate one of said agents;
and
an arbitration request connection coupling said dual transaction control logic units, such that a PCI read request by one of said agents recognized by one of said coupled dual transaction control logic units, is signaled to said arbitration request connection, said arbitration request connection arbitrating between said transaction control logic units for reserving said same PCI bus for said one agent, said one said transaction control logic unit granting said read access operation, and said one said transaction control logic unit maintaining said signal at said arbitration request connection, maintaining said reservation, until completion of said contiguous read operations.

A PCI bus system for managing read access between two agents providing PCI read requests to conduct contiguous read operations to a central resource, said PCI bus system comprising:

a PCI bus coupled to said central resource;
dual transaction control logic units, each respectively coupled to a separate one of said agents, and coupled to the same said PCI bus;
and
an arbitration request connection coupling said dual transaction control logic units, such that a PCI read request by one of said agents recognized by one of said coupled dual transaction control logic units, is signaled to said arbitration request connection, said arbitration request connection arbitrating between said transaction control logic units for reserving said same PCI bus for said one agent, said one said transaction control logic unit granting said read access to said PCI bus for said one agent, and said one transaction control logic unit maintaining said signal at said arbitration request connection, maintain said reservation, until completion of said contiguous read operations.

1 more element

Dependencies are inferred from the claim text.

Management of PCI read access to a central resource

Life of this patent

Management of PCI read access to a central resource

Life of this patent

Abstract

Claims21