SHARED MEMORY EXCLUSIVE CONTROL DEVICE AND SHARED MEMORY EXCLUSIVE CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a shared memory exclusive control device that suppresses the circuit scale increase of the whole of a system and is increased in the utilization efficiency and processing performance of a bus.;SOLUTION: A processor 11, if it can access a shared memory 15 through a memory bus 17, sets an identification number of the processor 11 in an address signal line of the memory bus 17 and acquires an exclusive right of use. A memory access controller 16 recognizes that the processor 11 has been permitted to access the shared memory 15 by the setting of the identification number of the processor 11 in the address signal line. Then, until the processor 11 releases the exclusive right of use, a retry reply is initiated through the memory bus 17 for a processor, except the processor 11, that gets access to the shared memory 11.;COPYRIGHT: (C)2004,JPO