| 摘要 |
PURPOSE:To supply the address conversion system where the trouble of concurrence of mapping registers is eliminated, by providing a physical program counter besides a logical program counter to shorten the time for address conversion. CONSTITUTION:At a normal access time, the access to memory 3 is performed by physical program counter 22, and the access completion time, countup output 14 which increases contents of logical and physical program counters 12 and 22 by +1 is outputted to provide for the next access. At a jump or interrupt occurrence time, a new value which is given by the output of operator 11 is set to logical program counter 12. The set address is converted to a physical address by mapping register group 21, and the physical address is set to physical program counter 22. |
