US 2003/0204682 A1 · Multiprocessor apparatus

Abstract

The present invention provides a multiprocessor which can decrease a required waiting time of access to improve the processing time thereof. There is provided a multiprocessor apparatus having a plurality of processor units in which each of processor units is arranged to include a processor, a local memory unit utilized for storing therein a copy of the whole data of a shared memory, and a copy circuit for controlling the local memory unit in the update processing when the contents of the shared memory are updated by the processor unit, wherein when the processor requests a piece of data that shall be stored in the shared memory with a data reading command, then the local memory unit reads the corresponding piece of data from the copied data stored therein and supplies it to the processor. The apparatus is applicable to a multiprocessing of a real time system, for example.

Claims16

Dependent claims

A multiprocessor apparatus having a plurality of processor units capable of executing an application processing independently, a shared memory for storing therein data commonly utilized by each processor unit upon executing the application processing, and a bus for interconnecting the plurality of processor units and the shared memory, each processor unit comprising:

a processor for carrying out a command executing processing for the application processing;
a local memory unit provided between the processor and the bus and utilized for storing therein a copy of the whole data of the shared memory;
and
a copy circuit for controlling the local memory unit so as to update the contents of the local memory unit when the contents of the shared memory are updated by any of the plurality of processor units, wherein
when the processor requests a piece of data that shall be stored in the shared memory with a data reading command, then the local memory unit responds to the reading command to read the corresponding piece of data from the copied data stored in the local memory unit and supplies the piece of data to the processor.

2 more elements

A multiprocessor apparatus having a plurality of processor units capable of executing an application processing independently, and a bus for interconnecting the plurality of processor units to one another, each of the processor units comprising:

a processor for carrying out data reading, data writing and a command executing processing for the application processing;
a local memory unit for storing therein data utilized by the processor for carrying out the application processing;
and
a copy circuit for controlling the local memory unit provided in its own processor unit so as to update the contents of the local memory unit if any other processor unit updates the contents of the local memory unit thereof.

1 more element

Dependencies are inferred from the claim text.

Multiprocessor apparatus

Life of this patent

Multiprocessor apparatus

Life of this patent

Abstract

Claims16