Abstract: An integrated circuit (IC) includes multiple circuits and functions which share multiple internal signal buses, three physical and five logical, according to distributed bus access and control arbitration. The multiple internal signal buses are shared among three tiers of internal circuit functions: a central processing unit and a DMA controller; a DRAM controller and a bus interface unit; and peripheral interface circuits, such as PCMCIA and display controllers. Two of the physical buses correspond to two of the logical buses and are used for communications within the IC. The third physical bus corresponds to three of the logical buses and is used for communications between the IC and circuits external to the IC. Arbitration for accessing and controlling the various signal buses is distributed both within and among the three tiers of internal circuit functions.

Abstract: A socket wrench coupler that will hold a socket in place on an engaged bolt or screw head or nut during turning of the engaged member and during repositioning of a driving handle, and including first and second relatively movable housings arranged to rotate together in either direction as driven by handle means attached to one of the housings upon compression of spring means biasing the housings apart or to rotate separately upon expansion of the spring means.