Data processing system utilizing a unique two-level microcoding

Details Data processing system utilizing a unique two-level microcoding Data processing system utilizing a unique two-level microcoding

1980-02-11

1983-07-19

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 922

Patent

active

043947360

ABSTRACT:
A data processing system using microcode architecture in which a two-level microcode system comprises one or more first, or "horizontal", microinstructions and a plurality of second or "vertical", microinstruction portions in a vertical microcontrol store. In a preferred embodiment the vertical microinstruction portions include one or more "modifier" fields, a selection field for selecting a horizontal microinstruction and a sequencing field for selecting the next vertical microinstruction portion of a sequence thereof, one or more fields of the horizontal microinstructions being capable of modification by the vertical modifier fields in order to form output microinstructions for performing data processing operations.

REFERENCES:
patent: 3599176 (1971-08-01), Cordero, Jr.
patent: 4130869 (1978-12-01), Kinoshita et al.
patent: 4231085 (1980-10-01), Bazlen et al.
patent: 4254461 (1981-03-01), Chemla et al.

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