System and method for memory hub-based expansion bus
First Claim
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1. A method of configuring a system memory, comprising:
- providing a memory module having a plurality of memory devices coupled to a memory hub, the memory hub adapted to receive memory command packets and access the memory devices according to the memory command packets and further adapted to provide memory responses in response thereto, the memory hub includinga switch circuit having a plurality of switch nodes and adapted to couple any one switch node to another switch node,a plurality of link interface circuits, each link interface circuit having a first node coupled to a respective one of the plurality of switch nodes and further having a second node coupled to either the first or second portions of the memory bus, each link interface circuit coupling signals from its first node to its second node,a memory controller coupled to a switch node of the switch circuit to receive memory command packets and translate the same into memory device command signals, anda local memory bus coupled to the memory controller and the memory devices on which the memory device command signals are provided;
coupling the memory hub of the memory module to a first portion of a memory bus coupled to a system controller, the system controller adapted to provide memory requests to access the memory devices on the first portion of the memory bus and receive memory responses from the memory hub on the first portion of the memory bus; and
coupling an expansion module having a processor circuit located thereon to a second portion of the memory bus coupled to the memory hub, the processor circuit adapted to provide memory requests on the second portion of the memory bus to the memory hub to access the memory devices of the memory module and further adapted to process data included in the memory responses provided on the second portion of the memory bus from the memory hub.
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Abstract
A system memory includes a memory hub controller, a memory module accessible by the memory hub controller, and an expansion module having a processor circuit coupled to the memory module and also having access to the memory module. The memory hub controller is coupled to the memory hub through a first portion of a memory bus on which the memory requests from the memory hub controller and memory responses from the memory hub are coupled. A second portion of the memory bus couples the memory hub to the processor circuit and is used to couple memory requests from the processor circuit and memory responses provided by the memory hub to the processor circuit.
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5 Claims
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1. A method of configuring a system memory, comprising:
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providing a memory module having a plurality of memory devices coupled to a memory hub, the memory hub adapted to receive memory command packets and access the memory devices according to the memory command packets and further adapted to provide memory responses in response thereto, the memory hub including a switch circuit having a plurality of switch nodes and adapted to couple any one switch node to another switch node, a plurality of link interface circuits, each link interface circuit having a first node coupled to a respective one of the plurality of switch nodes and further having a second node coupled to either the first or second portions of the memory bus, each link interface circuit coupling signals from its first node to its second node, a memory controller coupled to a switch node of the switch circuit to receive memory command packets and translate the same into memory device command signals, and a local memory bus coupled to the memory controller and the memory devices on which the memory device command signals are provided; coupling the memory hub of the memory module to a first portion of a memory bus coupled to a system controller, the system controller adapted to provide memory requests to access the memory devices on the first portion of the memory bus and receive memory responses from the memory hub on the first portion of the memory bus; and coupling an expansion module having a processor circuit located thereon to a second portion of the memory bus coupled to the memory hub, the processor circuit adapted to provide memory requests on the second portion of the memory bus to the memory hub to access the memory devices of the memory module and further adapted to process data included in the memory responses provided on the second portion of the memory bus from the memory hub. - View Dependent Claims (2, 3, 4, 5)
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Specification