Microword control mechanism utilizing a programmable logic array

Details Microword control mechanism utilizing a programmable logic array Microword control mechanism utilizing a programmable logic array

1982-02-22

1985-04-02

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 922

Patent

active

045091145

ABSTRACT:
A microword control mechanism is provided for producing the sequences of microwords used to control the execution of processor instructions in a microprogrammed data processor. This microword control mechanism includes circuitry (15, 20) responsive to a processor instruction to be executed for providing an instruction dependent signal uniquely representative of such instruction. This microword control mechanism also includes sequence counter circuitry (18) for supplying a sequence of number signals. This microword control mechanism further includes a programmable logic array (17) responsive to the instruction dependent signal and to the sequence of number signals for producing a sequence of microwords needed to execute the processor instruction.

REFERENCES:
patent: 3736567 (1973-05-01), Lotan et al.
patent: 4106090 (1978-08-01), Erickson et al.
patent: 4156900 (1979-05-01), Gruno et al.
patent: 4195352 (1980-03-01), Tu et al.
patent: 4354228 (1982-10-01), Moore et al.
patent: 4392198 (1983-07-01), Shimazaki
Adams et al., "How Bit-Slice Families Compare: Part 2, Sizing Up the Microcontrollers", Electronics, Aug. 17, 1978, pp. 96-102.
Cook et al., "A Study in the Use of PLA-Based Macros", IEEE Journal of Solid-State Circuits, vol. SC-14, No. 5, Oct. 1979, pp. 833-840.
Manning et al., "Microprogrammed Processor Having PLA Control Store", IBM Technical Disclosure Bulletin, vol. 22, No. 6, Nov. 1979, pp. 2440-2441.

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