Microprogram control device for controlling data path section in

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39542105, 364DIG1, 364244, 3642446, 3642551, 3642558, 3642624, 3642628, G06F 926

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active

054540887

ABSTRACT:
A microprogram control device controls a data path section provided in a CPU, which uses a microcode stored in a microprogram memory by using a microprogramming method. The control device includes an instruction register for storing an instruction code which is received from a data bus and an address generator for generating an address signal to access the microprogram memory, from the output of the instruction register. The address generator uses a first address decoder for decoding the type of the instruction from a particular bit in the instruction code and a second address decoder for decoding the addressing mode of the instruction from another particular bit of the instruction code. A third address decoder is included for designating the timing for accessing the microprogram memory at each cycle of the instruction.

REFERENCES:
patent: 3391394 (1968-07-01), Ottaway et al.
patent: 3990052 (1976-11-01), Gruner
patent: 4047247 (1977-09-01), Stanley et al.
patent: 4370709 (1983-01-01), Fosdick
patent: 4370729 (1983-01-01), Bosch
patent: 4835679 (1989-05-01), Kida et al.
Strip Architecture fits microcomputer into less silicon by John Hayne.

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