Multiprocessor arrangement including bus arbitration scheme involving plural CPU clusters that address each other as "phantom" CPUs
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United States of America Patent
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Aug 10, 1999
Grant Date -
N/A
app pub date -
Jul 9, 1997
filing date -
Feb 7, 1997
priority date (Note) -
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Abstract
At least two clusters of CPUs are present in a multiprocessor computer system. Each CPU cluster has a given number of CPUs, each CPU having an associated ID such as an ID number. An additional ID number, not associated with a CPU in the same cluster, is associated with the opposite CPU cluster that appears to the original cluster as a 'phantom' processor. A round-robin bus arbitration scheme allows ordered ownership of a common bus within a first cluster until the ID reaches the 'phantom' processor, at which time bus ownership passes to a CPU in the second cluster. This arrangement is preferably symmetric, so that when a CPU from the first cluster requests ownership of the bus, it is granted bus ownership by virtue of the first cluster's appearance to the second cluster as a 'phantom' CPU.
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