Multiple control store microprogrammable control unit including

Details Multiple control store microprogrammable control unit including Multiple control store microprogrammable control unit including

1977-11-22

1979-05-22

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 916, G06F 1300

Patent

active

041562780

ABSTRACT:
A microprogrammable control unit of a data processing unit includes first and second control stores. The first control store is addressed initially by the operation code of a program instruction for read out of an address field, a control sequence field and a register control field. The second control store is arranged to store a plurality of microinstruction sequences for executing program instructions. The control sequence field conditions hardware sequence control circuits to execute operations during instruction and cache cycles of program instruction processing. The address field is used for accessing a microinstruction sequence during the execution cycles of program instruction processing for completion of the operation specified by a program instruction. The register control field is used to condition register circuits, register busy circuits or increment circuits for selecting various program visible registers, for controlling the updating of registers or for specifying an increment value to be added to the program instruction counter respectively during the processing of program instructions in the hardware sequence circuits and microinstruction sequences stored in the second control store.

REFERENCES:
patent: 3766532 (1973-10-01), Liebel, Jr.
patent: 3800293 (1974-03-01), Enger et al.
patent: 3872447 (1975-03-01), Tessera et al.
patent: 4042972 (1977-08-01), Gruner et al.
patent: 4070703 (1978-01-01), Negi

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