G - Physics – 06 – F
Patent
G - Physics
06
F
354/239
G06F 12/06 (2006.01)
Patent
CA 1048159
Abstract of the Disclosure An address extending control circuit is disclosed which is provided with a memory having a memory capacity larger than that assignable with the content of an address register. The memory area of the memory is divided in- to a common block and a plurality of segment blocks of variable capacity. In a certain processing, the common block and any one of the segment blocks are utilized in pairs, thereby to obtain an extended address. To this end, an address extending address register capable of selecting a predetermined seg- ment block of the memory is provided in addition to the address register. When the value in the address register is detected to be larger than a prede- termined value, the content of the address extending address register corres- ponding thereto is added to the content of the address register to increase the number of bits and a combination of the common block with one segment block of the memory is selected, with which an address is the selected segment block is accessed. Thus, address extending can be achieved with a simple con- struction.
241966
Ikuta Hiroaki
Nagasawa Yoshio
Naruke Yoshikazu
Yakushi Masanori
Na
Panafacom Limited
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