Microprocessor with a reduced size microprogram

Details Microprocessor with a reduced size microprogram Microprocessor with a reduced size microprogram

1990-07-16

1993-08-03

Clark, David L.

Boots, shoes, and leggings

395400, 395775, 3642310, 3642328, 3642624, 3642628, 36426281, 364DIG1, 3649462, 3649466, 364DIG2, G06F 922

Patent

active

052336956

ABSTRACT:
When a data processing instruction is given to a microprocessor, and the code of a data register subject to designation is held in an instruction register, a first logic level is outputted from the instruction code decoder, but when the register subject to designation is the instruction queuing register in which a subsequent instruction code is to be held, a second logic level is outputted from the instruction code decoder. By the operation of logic switching means, when the first logic level is being outputted, the register select code decoder can select the data register designated, while when the second logic level is being outputted, the register select code decoder can select the instruction queuing register designated. Accordingly, this eliminates the necessity of carrying out the designation of a data register or queuing register in the microprogram, thus making it possible to reduce the size of the microprogram used.

REFERENCES:
patent: 4080648 (1978-03-01), Asano et al.
patent: 4236206 (1980-11-01), Strecker et al.
patent: 4363091 (1982-12-01), Pohlman, III et al.
patent: 4554627 (1985-11-01), Holland et al.
patent: 4616313 (1986-10-01), Aoyagi
patent: 4807113 (1989-02-01), Matsumoto et al.
patent: 4812972 (1989-03-01), Chastain et al.
patent: 4835679 (1989-05-01), Kida et al.

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