DUAL PORT MEMORY HAVING ACCESS CONTROL DEVICE FOR SHARED MEMORY, MULTI-PROCESSOR SYSTEM HAVING ACCESS CONTROL DEVICE FOR SHARED MEMORY AND METHOD FOR CONTROLLING ACCESS FOR SHARED MEMORY

摘要

One dual-ported memory, share memory access control device, a multicomputer system having the same, and its shared drive access control method, it is arranged to minimize waiting time, it is taken until a first processor has low performance and bigger data processing unit, one shared memory area of access than single treatment device. The shared memory area (217) that one memory array (210) is at least accessed by first and second processor (110,120). One first memory interface (230) execute data read/write operation from/in the address based on first processor/control signal shared memory area. One auxiliary memory interface (240) execute data read/write operation from/in the address based on second processor/control signal shared memory area. Optionally a memory access controller (227) is typically connected to first and second memory interface, first and second processor is made to be able to access that shared memory area, and first processor is made to be able to access that the shared memory area with priority. Memory access controller includes a storage control (220) and a hardware semaphore (225), and providing an access for first and second processor allows signal.