Method and system for performing an asymmetric bus arbitration protocol within a data processing system
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United States of America Patent
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Nov 25, 1997
Grant Date -
N/A
app pub date -
Dec 14, 1995
filing date -
Dec 14, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An arbitration protocol, preferably known as data-valid extended (DVE) protocol, for determining which one of the two units within a computer system may obtain access to a common bus is described. The DVE protocol is based on a point-to-point communication between two peer units. The DVE protocol is a physical level signalling convention for controlling switch communications on bi-directional address buses and data buses in a boundary-latched synchronous environment. The DVE protocol is asymmetric, yet fair, and is designed to minimize the number of cycles spent (or latency) in accessing the address or data buses and to maximize the number useful cycles (or bandwidth) on the address buses as well as the data buses. The asymmetry of the DVE protocol reduces the number of cycles spent in arbitration to zero for any data transfer size greater than one.
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