Data processor employing the same microprograms for data having

Details Data processor employing the same microprograms for data having Data processor employing the same microprograms for data having

1990-12-20

1991-12-31

Eng, David Y.

Boots, shoes, and leggings

3642549, 364DIG1, G06F 9318, G06F 938

Patent

active

050776592

ABSTRACT:
A data processor having an inner instruction register, a microinstruction register, and microinstruction decoder for decoding the microinstruction stored in the microinstruction register, and a data expansion section for expanding data bits stored in source and destination registers among general purpose registers when designated by an inner instruction in which the bit lengths of data to be processed can be designated by an inner instruction, a microinstruction for performing the operation of data having same contents but different bit lengths can be made common, thereby reducing the number of steps of the microprograms.

REFERENCES:
patent: 4038533 (1977-07-01), Dummermuth
patent: 4099229 (1978-07-01), Kancler
patent: 4219874 (1980-08-01), Gusev et al.
patent: 4236206 (1980-11-01), Strecker et al.
patent: 4241397 (1980-12-01), Strecker et al.
patent: 4246644 (1981-01-01), Flynn et al.
A. Tanenbaum, "Structured Computer Organization", 1976, Prentice-Hall, pp. 70-79.

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