Method and apparatus for multilevel bus arbitration

Details Method and apparatus for multilevel bus arbitration Method and apparatus for multilevel bus arbitration

1992-10-28

1995-04-04

Coleman, Eric

Boots, shoes, and leggings

3642428, 3642429, 36424292, 364247, 364DIG1, G06F 1314

Patent

active

054045380

ABSTRACT:
A programmable hardware adapter for switching between two or more levels of arbitration priority for devices connected to a communications bus without host processor intervention. The adapter is programmed with an external arbitration value at initial program load. A control bit selects whether the arbitration level within the adapter is used for arbitration or if the device's internal arbitration level is used. When the external arbitration level is used to vie for the bus, the adapter's state machine sends a signal to the device to tell it it won or lost, depending on the outcome of the arbitration.

REFERENCES:
patent: 4628447 (1986-12-01), Cartret et al.
patent: 4788639 (1988-11-01), Tamoru
patent: 4991085 (1991-02-01), Pleva et al.
Micro Channel Procedures, Micro Channel Architecture, Nov. 1989, pp.1-21 to 1-29.

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