Central processing unit for a digital computer

Details Central processing unit for a digital computer Central processing unit for a digital computer

1983-10-03

1986-04-29

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 922, G06F 930, G06F 1300

Patent

active

045861307

ABSTRACT:
A central processing unit for a digital computer has a central memory unit connected to a system bus. A data path unit decodes variable length microinstructions that are stored in the central memory unit and that include an operation code and one or more operand specifiers, issuing a microaddress of one of a set of microinstructions stored in a control store. The microinstructions have a data path control field, a condition/size field and a next address control field. A microinstruction logic control is responsive to the microinstructions, and a memory control unit that includes a data cache memory array operates asynchronously with respect to the data path unit, translating virtual memory addresses to access data from the data cache memory array or from the central memory unit.

REFERENCES:
patent: 3725868 (1973-04-01), Malmer, Jr. et al.
patent: 3778776 (1973-12-01), Makosaki
patent: 4104718 (1978-08-01), Poublan et al.
patent: 4396982 (1983-08-01), Wada et al.
patent: 4450523 (1984-05-01), Pilat et al.

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