Microprogram control system

Details Microprogram control system Microprogram control system

1986-01-14

1989-05-30

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 922, G06F 1300

Patent

active

048356794

ABSTRACT:
Micro instructions having a predetermined relationship with respect to each other are modified so that an original micro instruction and address assigned thereto can be restored by combining one or more modified micro instructions and address assigned thereto. A microprogram memory stores the micro instructions in such a modified form and at the modified address. When an original address is designated, one or more term lines are activated in a decoder of the microprogram memory, and modified micro instructions corresponding to the activated term lines are read-out from a memory array of the microprogram memory. The read modified micro instructions are logically combined to restore the original micro instruction. Thereby, the number of micro instructions to be actually stored in the microprogram memory can be reduced.

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M. S. Schmookler, "Two-Level Programmed Logic Array Adder", I.B.M. Technical Disclosure Bulletin, vol. 21, No. 11, Apr. 79, pp. 4313-4316.

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