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Definition of "bus priority" |
rules for deciding the precedence of devices in having bus requests honored. Devices issue requests on one of several bus request lines, each with a different bus priority. A high priority request then “wins” over a simultaneous request at a lower priority. The request grant signals then “daisy chains” through successive devices along the bus or is sent directly to devices in appropriate order. The requesting device closest to the bus controller then accepts the grant and blocks its propagation along the bus. Buses may have handle interrupts and direct memory accesses with separate priority systems. |
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