Table driven decision and control logic for digital computers

Details Table driven decision and control logic for digital computers Table driven decision and control logic for digital computers

1977-09-02

1980-12-02

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 922, G06F 1300, G06F 942

Patent

active

042375320

ABSTRACT:
Decision and control logic for use in digital computers that operate in cycles provides binary valued decision signals for effecting decisional control within the computer such as that utilized in conditional branching. The decision signals are provided in accordance with binary valued control functions of binary valued static and dynamic control variables utilized in the computer. The dynamic control variables are available in a computer cycle subsequent to the availability of the static variables and represent conditions of various components of the computer. Truth tables of the control functions are stored in logic function memories addressed by logic function selection control fields of computer control words, the control fields selectively addressing the truth tables in accordance with the desired functions. The static variables are utilized for addressing the logic function memories for providing the truth table entries corresponding to the selected function of the static control variables and the dynamic variables select among the addressed truth table entries to provide the binary valued decision control signals. Preferably the logic function memories are implemented by LSI integrated circuits.

REFERENCES:
patent: 3950730 (1976-04-01), Bienvenu et al.
patent: 4044334 (1977-08-01), Bachman et al.
patent: 4056844 (1977-11-01), Izumi
patent: 4057848 (1977-11-01), Hayashi

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