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System and method for memory hub-based expansion bus

  • US 7,174,409 B2
  • Filed: 04/07/2006
  • Issued: 02/06/2007
  • Est. Priority Date: 03/25/2004
  • Status: Expired due to Fees
First Claim
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1. A method of accessing a system memory having first and second memory modules, each memory module having a plurality of memory devices and a respective memory hub coupled to a respective plurality of memory devices, the memory hubs coupled to each other, the method comprising:

  • generating memory requests by a memory hub controller for access to the plurality of memory devices of the first memory module;

    coupling the memory requests from the memory hub controller to the first memory hub;

    generating memory requests by a processor circuit of an expansion module coupled to the second memory hub for access to the plurality of memory devices of the second memory module;

    coupling the memory requests from the processor circuit to the second memory hub;

    generating memory responses by the second memory hub in response to receiving the memory request from the processor circuit; and

    coupling the memory responses from the second memory hub to the processor circuit of the expansion module.

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