Two-level control store for microprogrammed data processor

Details Two-level control store for microprogrammed data processor Two-level control store for microprogrammed data processor

1979-05-21

1982-04-13

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 922

Patent

active

043251218

ABSTRACT:
A data processor having an execution unit and which includes a control means having a first and a second control store. The control means has an input for receiving a control store address. In response to the received control store address, the first control store provides sequencing information at a first output for selecting the next control store address. Also, in response to the received control store address, the second control store supplies control information at a second output for controlling the execution unit. The data processor also includes means for receiving a macroinstruction and selection means responsive to the macroinstruction and to the sequencing information for generating the control store address. In a preferred embodiment, the control store address is received by both the input of the first control store and the input of the second control store. Each control word in the first control store has a unique control store address. However, a control word, in the second control store may be selected by many different control store addresses.

REFERENCES:
patent: 3886523 (1975-05-01), Ferguson et al.
patent: 4008462 (1977-02-01), Kanda
patent: 4155120 (1979-05-01), Keefer et al.
patent: 4156278 (1979-05-01), Wilhite
patent: 4156279 (1979-05-01), Wilhite
patent: 4168523 (1979-09-01), Chari et al.

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