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Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
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A method to support memory mirroring on a bus containing multiple
independent SDRAM or DDR
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
54% of the total text.
Page 1 of 2
Memory mirroring for same bus attached SDRAM and DDR SDRAM
This invention describes a method to support memory mirroring on a bus containing multiple independent SDRAM or
DDR SDRAM DIMMs. In standard computer systems, the memory controller can correct single bit errors and detect multibit errors. Certain chipset also have the ability to correct some multibit errors. This invention would provide the chipset the ability to correct all multibit errors allowing the system to continue to run and thus reducing unscheduled downtime.
This invention operates by mirroring the data contained in one DIMM on a secondary DIMM of the same organization. The two DIMMs must be on the same memory data and address bus. In the course of sending a command to the DIMM, the chipset would drive the chip selects of the primary and secondary DIMM simultaneously. This will cause the command and subsequently any data transmitted on the bus to be stored in both the primary and secondary DIMMs. By applying the same command to both DIMM's the system can be assured that the DIMMs are in the same state. The only difference occurs when a read data transfer is to take place. Upon issuing a read command, only the primary DIMM's chip select will be selected. This will ensure that I/O contention will not occur since only one DIMM will be driving data. If the chipset detects an uncorrectable memory error during a read from the primary DIMM, it can perform the same read transaction to the secondary DIMM...