MULTIPROCESSOR APPARATUS
Disclosed is a multiprocessor apparatus including a co-processor provided in common to a plurality of processors and including a plurality of resources and an arbitration circuit that arbitrates contention among the processors with respect to use of a resource in the co-processor by the processors through a co-processor bus, which is a tightly coupled bus, for each resource or each resource hierarchy according to instructions issued from the processors to the co-processor. Under control by the arbitration circuit, simultaneous use of a plurality of resources on a same hierarchy or different hierarchies in the co-processor by the processors through the tightly coupled bus is allowed.
1 . A multiprocessor apparatus comprising:
a plurality of processors;
a co-processor provided in common to the processors and including a plurality of resources; and
an arbitration circuit that arbitrates contention among the processors for each resource or each hierarchy of a plurality of resources according to instructions issued to the co-processor from the processors.
2 . The multiprocessor apparatus according to claim 1 , wherein the co-processor variably sets connecting relationships among the resources in the co-processor according to the instructions issued to the co-processor from the processors.
3 . The multiprocessor apparatus according to claim 1 , wherein the processors are connected to the co-processor via a tightly coupled bus.
4 . The multiprocessor apparatus according to claim 3 , wherein under control by the arbitration circuit, simultaneous use of a plurality of mutually contention free resources on a same hierarchy or different hierarchies in the co-processor by the processors through the tightly coupled bus is allowed
5 . The multiprocessor apparatus according to claim 1 , wherein the co-processor variably sets connecting relationships among the resources in the co-processor according to the instructions issued to the co-processor from the processors.
6 . The multiprocessor apparatus according to claim 1 , wherein extended instructions that exclusively use one or a plurality of the resources in the co-processor are provided as an instruction set; and
when the extended instructions are simultaneously issued to the co-processor from the processors, contention on the basis of the one or the plurality of the resources corresponding to the extended instructions is subjected to arbitration by the arbitration circuit.
7 . The multiprocessor apparatus according to claim 6 , wherein the extended instructions include:
first-layer extended instructions corresponding unit functions of circuit resources, respectively; and
second-layer extended instructions each of which implements a predetermined function by combining a plurality of the circuit resources corresponding to the first-layer extended instructions.
8 . The multiprocessor apparatus according to claim 7 , wherein the extended instructions include:
third-layer extended instructions each of which implements a predetermined function by combining the circuit resources corresponding to the second-layer extended instructions.
9 . The multiprocessor apparatus according to claim 6 , wherein the co-processor comprises:
an interface circuit that interfaces with each of the processors through a tightly coupled bus;
a decoder that interprets a command supplied from the each of the processors through the tightly coupled bus;
a control circuit that controls a function of the co-processor according to a signal resulting from decoding of the command;
circuit resources including arithmetic circuits and register files; and
multiplexers arranged on input/output buses of the circuit resources;
the control circuit outputting a selection signal specifying connecting destinations of the multiplexers.