QUICK ACCESS CONTROL SYSTEM FOR CPU

摘要

PROBLEM TO BE SOLVED: To obtain a smooth quick access between a CPU and a quick access area by controlling the switching of a switching means for a data bus between the control means and a normal access area. SOLUTION: Data among a CPU 1 to be a control means, a quick access area 2 related to the CPU 1 and a normal access area 3 requiring a normal access related to the CPU 1 are transmitted through a data bus 4 to be an address/data line. A bus switch 5 to be a switching means for turning on/off the bus 4 is connected between the CPU 1 and the area 3. At the time of detecting an access command for urging access operation from the CPU 1 to the area 2 in accordance with a prescribed signal, a bus control part 6 controls the switching of the bus switch 5 so as to turn off the data bus 4 between the CPU 1 and the area 3.