Overlapped control store

Details Overlapped control store Overlapped control store

1986-03-28

1988-06-28

Harkcom, Gary V.

Boots, shoes, and leggings

371 10, 371 13, G06F 1100

Patent

active

047543965

ABSTRACT:
An overlapped control store including a pair of memory elements, with each element in the pair storing a complete instruction set and with instructions from the elements accessed on alternate clock cycles. A mux, controlled by a control field in each instruction, is adapted to provide either a PC address or a target address to the control store. Unrestricted branches are facilitated because every instruction in the instruction set is included in both memory elements.

REFERENCES:
patent: 3629842 (1971-12-01), Taylor et al.
patent: 3668644 (1972-06-01), Looschen
patent: 3867579 (1975-02-01), Colton et al.
patent: 4366535 (1982-12-01), Cedolin
patent: 4413327 (1983-11-01), Sabo et al.
patent: 4601018 (1986-07-01), Baum et al.
patent: 4656610 (1987-04-01), Yoshida et al.
"Principles of Firmware Engineering in Microprogram Control," M. Andrews, Computer Science Press, 1980, pp. 71-79.

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