Shared bus arbitration apparatus having a deaf node
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United States of America Patent
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Aug 24, 1993
Grant Date -
N/A
app pub date -
Jul 2, 1990
filing date -
Jul 2, 1990
priority date (Note) -
Expired
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Abstract
An improved arbitration technique for a computer network system in which multiple nodes communicate using a shared bus, and at least one node has no knowledge of the current status of the arbitration taking place between all nodes in the system. Such a node is called a 'deaf node'. Each node in the system is assigned an initial arbitration count number, for example, N+1, where N is the node number assigned to the node. The arbitration count number is the number of quiet slots a node must count before trying to transmit on the system bus. The length of a quiet slot is determined by a particular system's electrical characteristics. One quiet slot is reserved as the 'deaf node quiet slot', during which a deaf node may transmit. In response to a transmission occurring in the deaf node quiet slot, each node in the system reinitializes its arbitration count number to its initial arbitration count number. Additionally, a node that is not a deaf node, but has detected a system error, may deliberately transmit during the deaf node quiet slot to reinitialize the arbitration count numbers or the internal clocks of all nodes in the system.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Abidi, Mohammad V | Shrewsbury, MA | 2 | 25 |
Cao, Xi-Ren | Acton, MA | 2 | 25 |
Colon-Osorio, Fernando | Stow, MA | 2 | 25 |
Lary, Richard F | Colorado Springs, CO | 28 | 1366 |
Quaynor, Nii | Shrewsbury, MA | 2 | 25 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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