Information processor operative both in direct mapping and in ba

Details Information processor operative both in direct mapping and in ba Information processor operative both in direct mapping and in ba

1989-04-07

1992-06-30

Popek, Joseph A.

Boots, shoes, and leggings

364DIG1, I20G 1206

Patent

active

051270960

ABSTRACT:
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 alteration 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) utilized as a memory block for storing a second program for direct mapping. In the bank mapping, each memory block is mapped into a same address area of an address space of the processor. In the direct mapping, the first and second memory areas are mapped in one-to-one correspondence into 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 predetermined identification information ("JA") is stored in a predetermined memory location of the second memory block. The execution of a program from one subroutine to another is performed using direct or bank mapping by determining whether the predetermined identification information is stored at an address in the address space which corresponds to the predetermined memory location.

REFERENCES:
patent: 4300192 (1981-11-01), Couleur et al.
patent: 4316244 (1982-02-01), Grondalski
patent: 4340932 (1982-07-01), Bakula et al.
patent: 4403287 (1983-09-01), Blahut et al.
patent: 4485457 (1984-11-01), Blaska et al.
patent: 4761733 (1988-08-01), McCrocklin et al.
Patent Abstracts of Japan, vol. 7, No. 32 (P-174) [1177], Feb. 8, 1983.
Patent Abstracts of Japan, vol. 11, No. 337 (P-633) [66], Nov. 5, 1987.

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