Intel Corporation

Hewlett-packard Development Company, L.P.

Mark A Heap

James W Alexander

Thomas J Holman

Stanley Steve Kulick

Gary Belgrave Gostin

Michael K Dugan

Curtis R McAllister

Henry Yu

Terry C Huang

According to one embodiment a computer system is disclosed. The computer system includes memory. The memory includes two or more rows, where each row has a plurality of memory devices. The computer system also includes a chipset. The chipset includes a detection/correction circuit to detect single and double symbol errors and correct single symbol errors for each memory row, and markers to maintain a log of errors within each memory row.

Mechanism for adjacent-symbol error correction and detection

One embodiment of the invention is a memory controller that maps a received address to a memory location in a plurality of memory banks, the memory controller comprising: circuitry for calculating a remainder from a division of the received address by a divisor, wherein the divisor is based on the number of the plurality of banks; circuitry for determining a particular bank of the plurality of banks based on the remainder and at least one bit of the received address; and circuitry for determining the memory location in the particular bank using at least a portion of the received address.

Mapping addresses to memory banks based on at least one mathematical relationship

An apparatus and method for performing speculative directory cache tag updates for read accesses to memory is herein disclosed. A control unit for performing tag updates is coupled between the memory controller and the memory bank in a multiprocessor system that employs a directory-based coherency protocol. The control unit transmits data read from the memory bank to the memory controller while calculating the updated tag that it then writes back to the memory bank. In this manner, the memory bank busy time and memory bus traffic are reduced thereby improving the overall performance of a memory access.

Apparatus and method for performing speculative cache directory tag updates

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Sunnyvale, CA, United States of America

Mark A Heap