System for docking a portable computer to a host computer withou

Details System for docking a portable computer to a host computer withou System for docking a portable computer to a host computer withou

1994-06-09

1997-05-20

Lee, Thomas C.

Boots, shoes, and leggings

395281, 395287, 395288, 3642311, 364240, 3642427, G06F 1314, G06F 1320, G06F 1336, G06F 1340

Patent

active

056320205

ABSTRACT:
A computer system includes a bus arbiter for providing immediate access to a bus in response to an external requirement or event. In a dockable computer system capable of hot docking or warm docking, the bus arbiter grants exclusive, non-preemptive access to the buses to the docking agent which is capable of quieting (rendering inactive) the bus of the portable computer and docking station in response to a notice signal. The notice signal is indicative of a change of states from the undocked state to the docked state or from the docked state to the undocked state. The notice signal may be provided from software, a user-actuated switch, or an infrared signal. In an audio-capable computer, the bus arbiter provides exclusive non-preemptive access to the digital signal processing peripheral device so that audio glitches are avoided. The arbiter preferably includes an override circuit for countermanding the fairness scheme employed by the bus arbiter and granting immediate bus access in response to the external event or condition. The bus arbiter preferably is able to provide fixed or rotating priority for bus accesses of other peripheral devices on the bus. The arbiter is preferably integrated with the main processor of the computer system.

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HPSIR, Special Infrared Communications Specification, introduction pages and pp. 1-9.

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