CPU DEAD LOCK AVOIDING DEVICE

摘要

PURPOSE:To avoid dead lock of a CPU device and to improve the check function by generating a false response signal if the address which is not used in a system is accessed from the CPU device. CONSTITUTION:A local address detecting part 2 generates a signal only when addresses of a device are accessed from the CPU device, and a CPU access detecting part 4 detects that the CPU device accesses some I/O or memory device. A local response signal generating part 5a of a response signal generating part 5 is started if an address of said device by output signals of the local address detecting part 2 and the CPU access detecting part 4, and a false response signal generating part 5b is started otherwise, and thus, response signals corresponding to respective start conditions are generated.