Microprogram control circuit

Details Microprogram control circuit Microprogram control circuit

1992-04-01

1994-09-06

Eng, David Y.

Boots, shoes, and leggings

36461D, 3642328, G06F 930

Patent

active

053455703

ABSTRACT:
In order to make possible expansion or change of the function by microinstruction without revising an instruction decoder in a microprogram control circuit, each time microinstruction memory means is accessed by micro address of the microinstruction selected by the instruction decoder, a microinstruction control circuit activates expansion microinstruction memory means in accordance with an information which is set in an information bit at each microinstruction, and the microinstruction is changed to an expansion microinstruction.

REFERENCES:
patent: 4093982 (1978-06-01), Hener et al.
patent: 4104720 (1978-08-01), Gruner
patent: 4153933 (1979-05-01), Blume
patent: 4236210 (1980-11-01), Terakawa
patent: 4503500 (1985-03-01), Magar
patent: 4532587 (1985-07-01), Roskell et al.
patent: 4794558 (1988-12-01), Thompson

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