Synchronization Control Device, Dual Port Memory Having Synchornization Control Device and Method for Controlling Synchonization in Dual Port Memory

摘要

A dual port memory having a synchronization control device, a multi-processor system having the same, and a synchronization control method thereof are provided to guarantee continuous synchronization between tasks even if context switching occurs between the tasks in a multitasking environment executing a plurality of tasks in one processor. A memory array(210) has at least one shared memory area(211-217) accessed by first and second processors(110,120). A first memory interface(220) performs data read/write operations from/on the shared memory area based on address/control signals of the first processor. A second memory interface(230) performs the data read/write operation from/on the shared memory area based on address/control signals of the second processor. A memory access controller(295) includes a plurality of semaphore cells(260-290) controlling exclusive access to the shared memory areas, and a synchronization controller(240) inputting/outputting access request/grand signals independently on the semaphore cell corresponding to the shared memory area which is accessed by at least one task executed in the first or second processor.