Data processing circuit with target instruction and prefix instr

Details Data processing circuit with target instruction and prefix instr Data processing circuit with target instruction and prefix instr

1996-12-18

2000-12-26

Donaghue, Larry D.

Electrical computers and digital processing systems: processing

Instruction decoding

Decoding instruction to accommodate variable length...

712226, G06F 1500

Patent

active

061675059

ABSTRACT:
A certain target instruction and a prefix instruction for expanding the function of that target instruction are input to the present data processing circuit. The data processing circuit analyzes the thus-input instruction code and performs the processing necessary for the execution of that instruction. The data processing circuit comprises an instruction decoder section, a register file, and an instruction execution section that executes the instruction based on operational details of the instruction analyzed by the instruction decoder section. The instruction decoder section comprises an ext instruction processing section that processed the expansion of immediate data from the prefix instruction.

REFERENCES:
patent: 3657705 (1972-04-01), Mekota, Jr. et al.
patent: 5303358 (1994-04-01), Baum
May et al. "The Transputer." Neural Computers, Sep. 28, 1997, pp. 477-486.
Dirac, J.F. "Control Word Expansion." IBM Technical Disclosure Bulletin, vol. 3, No. 7, Dec. 1960, p. 23.

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