Apparatus and method in a computer for executing calculation ins

Details Apparatus and method in a computer for executing calculation ins Apparatus and method in a computer for executing calculation ins

1992-11-18

1995-06-06

Lall, Parshotam S.

Boots, shoes, and leggings

364239, 3642595, 364263, 364DIG1, G06F 900, G06F 1300

Patent

active

054230128

ABSTRACT:
In a microcomputer, for using all the instruction words having uniform word length, a first or second instruction word stored in a memory area of a memory indicated by an address of an address register is read in a predetermined word position of an instruction first-reading buffer indicated by a first pointer and the first or second instruction word read from a word position of the instruction first-reading buffer indicated by a second pointer is read in an instruction interpreting section through a second shifter. This instruction interpreting section interprets an instruction word from a bus interface section. In the case of the second instruction word (data instruction), data necessary for a calculation are produced on the basis of data of the second instruction word such as immediate data and offset data. In the case of the first instruction word, a calculation is effected on the basis of data produced by a data expansion section.

REFERENCES:
patent: 4370709 (1983-01-01), Fosdick
patent: 5057837 (1991-10-01), Colwell et al.

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