Remapping memory devices during operation
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United States of America Patent
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Nov 9, 2004
Grant Date -
N/A
app pub date -
Dec 28, 1999
filing date -
Dec 28, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
According to the invention, systems, apparatus and methods are disclosed for automatically replacing semiconductor based memory in a system while that system is operating. Replacement is accomplished by blocking access to the memory devices to be swapped, copying the contents of the faulty device to the replacement device, swapping the IDs of the two devices, and re-enabling access to the replaced device. This replacement is triggered by interrupts from the error detection logic. After replacement, the system automatically checks the faulty device to determine its suitability for use as a spare in the future. The determination is made by repeatedly writing and reading a pseudo-random pattern into the device and logging any errors.
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