Apparatus and method for determining access to a bus

Details Apparatus and method for determining access to a bus Apparatus and method for determining access to a bus

G - Physics

06

F

354/232

G06F 13/36 (2006.01) G06F 13/364 (2006.01)

Patent

CA 1306550

APPARATUS AND METHOD FOR DETERMINING ACCESS TO A BUS ABSTRACT OF THE INVENTION A system and method for nodes to obtain access to a bus. In this arbitration method, a central arbiter selects a particular node and issues a conditional grant. The condi- tional grant is transmitted before it is determined whether access to the bus will actually transfer to another node. Each node contains distributed logic that examines an extend bus cycle signal to determine whether it can become a transmitter to transfer messages on the bus. When a node becomes a trans- mitter, it generates an extend bus cycle signal to maintain access to the bus when executing a multi-cycle transfer, even though other nodes, perhaps with higher priorities, require access to the bus.

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