MULTI-PROCESSOR DEVICE

摘要

PURPOSE:To produce the next command before the execution is through with the present command by invalidating the contents of a command memory with use of a command valid flag after a subprocessor reads out a command. CONSTITUTION:When a main processor 5 produces a command, a command valid flag is read out and the command is written into a command memory 1 when the flag 2 shows that the contents of a command memory 1 are invalid. Thus the flag 2 shows that the contents of the memory 1 are valid. A subprocessor 6 reads out the flag 2 continuously until the flag 2 shows that the contents of the memory 1 are valid. Then the subprocessor 6 reads a command out of the memory 1 and sets the flag 2 to show that the contents of the memory 1 are invalid so that the processor 5 can produce the next command. Thus the processor 5 can produce the next command before the subprocessor 6 ends execution of a command.