Direct-execution microprogrammable microprocessor system

Details Direct-execution microprogrammable microprocessor system Direct-execution microprogrammable microprocessor system

1985-03-11

1988-08-02

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 922

Patent

active

047617330

ABSTRACT:
A direct-execution microprogrammable microprocessor system uses an emulatory microprogrammable microprocessor for direct execution of microinstructions in main memory through a microinstruction port. A microinstruction cache with a microinstruction address extension unit serving to communicate microinstructions from the main memory to the microprogrammable microprocessor. Virtual main memory accesses occur through a system multiplexer. A virtual address extension unit and a virtual address bus provide extension and redefinition of the main memory address space of the microprogrammable microprocessor. The system also uses a context switching stack cache and an expanded address translation cache with the microprogrammable microprocessor having a reduced and redefined microinstruction set with a variable microinstruction cycle.

REFERENCES:
patent: 4407016 (1983-09-01), Bayliss et al.
Ohr, "Risc Machines", Electronic Design, Jan. 10, 1985.
Markoff, "Risc Chips", Byte, Nov. 1984.
Patterson, "Reduced Instruction Set Computers", Communications of the ACM, Jan. 1985, vol. 28, No. 1.
"How a 100-Year Old Computer Company Got into Microelectronics", NCR Microelectronics Division.
"NCR/32-000 32-Bit Microprogrammable microprocessor", NCR Microelectronics Division.
NCR General Information Manual, NCR Corporation.

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