| 摘要 |
PROBLEM TO BE SOLVED: To provide a processor system which can attain security protection of a program with an easier system. SOLUTION: When a CPU 2 which incorporates a cache 5 and a prefetch control section 6, an IC 8 for control and a ROM 4 in which a control program 3 to be executed by the CPU 2 are connected to a common bus 9, a bus bridge 10 and a multiplexer 13 permit access to the ROM 4 only when a prefetch signal is active. COPYRIGHT: (C)2007,JPO&INPIT |
