Integrated scannable rotational priority network apparatus

摘要

An integrated priority network is provided for a bus architecture computing system of the type employing a M-Bus connected to a plurality of functional elements. Each functional element has its own integrated priority resolution network (IPRN) coupled to said M-Bus for activating its own unique individual priority request and for receiving all individual priority requests from all other functional elements. Each integrated priority resolution network unit is provided with a rotational priority circuit and a preemptive priority circuit connected in parallel and operable independently to produce a request granted signal. Logic circuits in each rotational priority circuit determine when an IPRN unit will be granted its priority request for access to said M-Bus and will block future requests from being activated to its IPRN unit until the other IPRN unit values in the rotational priority register of the rotational priority circuit have been granted access to said M-Bus. The IPRN unit is also scannable to determine its rotational priority status.