in direktabbildung and bankabbildung effective informationsprozessor and method for switching the abbildungsschemas

摘要

An information processing apparatus includes a program memory (4, 40) and circuitry for switching mapping schemes so as to deal with both direct and bank mapping schemes without alternation of programs. The program memory (4) includes a first memory area (14, 15) formed of a plurality of memory blocks for storing a first program (100) for the bank mapping and a second memory area (16, 17) formed of one memory block for storing a second program for the direct mapping. In the bank mapping, each memory block is mapped in a same address area of an address space of the processor. In the direct mapping, the first and second memory area is mapped in one-to-one correspondence on the address space. Alternative program memory (40) includes a first memory block (50) storing a first program and a second memory block (60) storing a second program. A particular identification information ("JA") is stored in a predetermined memory location of the second memory block. The transition of a program from one program to the other is performed depending on the decision as to whether the identification information is stored at an address in the address space which corresponds to the predetermined memory location when the first and second memory blocks are mapped based on the direct mapping scheme.