Method and apparatus for minimizing the number of control words

Details Method and apparatus for minimizing the number of control words Method and apparatus for minimizing the number of control words

1993-04-15

1996-10-22

Treat, William M.

Boots, shoes, and leggings

3642318, 3649583, 364DIG1, 364DIG2, G06F 922

Patent

active

055686222

ABSTRACT:
Method and apparatus to reduce the number of control words stored in a read only control store of a microprogrammed unit of the CPU of a large scale computer. A set of control fields are required to control the active elements of the unit to cause the unit to execute a large number of different basic operations. Typically the required set of control fields are included in control words stored in a control store controlling the unit during the execution of a basic operation. Obtaining some of the set of required control fields from other sources available within the unit results in a significant reduction in the number of control words stored in the control store without reducing the functionality of the unit.

REFERENCES:
patent: 3651475 (1972-03-01), Dunbar et al.
patent: 3958227 (1976-05-01), Evans
patent: 4031515 (1977-07-01), Kashio
patent: 4357678 (1982-11-01), Davis
patent: 4485468 (1982-04-01), Slana
patent: 4489395 (1984-12-01), Sato

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