Patent
1995-12-14
1999-02-23
An, Meng-Ai T.
395729, 395730, 395732, G06F 1300
Patent
active
058753389
ABSTRACT:
According to the present invention, an apparatus for arbitrating between several competing requests that has a number of components cooperate together is disclosed. A number of arbiter cells are provided. These arbiter cells contain a device for shifting a token value, a number of receptors for receiving request signals, and internal circuitry for selecting one of the request signals. The request signal selected by a given arbiter cell depends on the state of the request signals being received by the cell and the position of the cell's token. Also, one or more group arbiters are provided. These group arbiters contain a device for shifting a token value, a number of receptors for receiving request signals, and internal circuitry for selecting an arbiter cell. The arbiter cell eventually selected by a given group arbiter depends on the state of the request signals being received by the arbiter and the position of the arbiter's token. In one mode of operation, each arbiter cell grants a single request signal from the plurality of signals present, and each group arbiter selects a single arbiter cell. This process allows the selection of at least one request signal from the number of request signals originally present.
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An Meng-Ai T.
Dillon Andrew J.
Henkler Richard A.
International Business Machines - Corporation
Thlang Eric S.
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