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Disclosed is a means to steer the spare bit into any data-bit position while the machine is operating without introducing a soft error in memory.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
73% of the total text.
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Capability to Steer a Spare Bit Without Introducing a Soft Error
Disclosed is a means to steer the spare bit into any data-bit position while
the machine is operating without introducing a soft error in memory.
Bit steering (sometimes referred to as sparing) is a means of increasing
system memory reliability. A spare bit is logically steered into a failing bit
position, effectively replacing it. This scheme requires the capability to
simultaneously write the failed bit position and the spare bit position on memory-
write-only. This capability is in addition to the ability to steer the spare bit
position on both reads and writes to memory. This steer-on-write-only capability
allows the entire spare bit column to be initialized with the correct data value
before the full read/write bit-steering function is enabled. Without this capability,
soft errors are introduced if the spare bit is steered into place during the system
To initialize the spare bit position before the bit-steering is enabled, the bank
of memory is scrubbed. Scrubbing is where the memory data is read from
memory, single bit errors are corrected, and corrected data is written back to
memory. By scrubbing the affected bank of memory (with the spare bit receiving
the same data as the failed bit position), the entire spare bit column can be
initialized. Once the spare bit is initialized, full bit-steering can be enabled
effectively, replacing the failed bit position with a functional and ini...