Register device

Details Register device Register device

1987-12-16

1990-07-31

Heckler, Thomas M.

Boots, shoes, and leggings

3649333, 3649262, 3649654, G06F 1200

Patent

active

049455109

ABSTRACT:
A register device includes a register set group, a switching control unit, a write control unit, a write flag memory unit, and a read control unit. The register set group consists of a plurality of register sets each constituted by a plurality of registers. The switching control unit selects a register set to be used in processing from the register set group in response to a saving/recovery instruction. The write control unit writes data in registers of the register set selected by the switching control unit in response to a write instruction. A write flag representing whether data is written in each of the registers is held by the write flag memory unit. The read control unit determines, in response to a read instruction, a register in which data is written most recently of a plurality of registers corresponding to each other between the register sets with reference to the write flags, thereby reading out data from the register.

REFERENCES:
patent: 4288860 (1981-09-01), Trost
patent: 4370730 (1983-01-01), Chadra
Reduced Instruction Set Computer Architecture for TLSI; M. G. H. Katevenis, 1984.

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