Boots – shoes – and leggings
Patent
1988-03-30
1991-06-04
Shaw, Gareth D.
Boots, shoes, and leggings
364933, 3649337, 3649333, 3649261, 3649262, G06F 900
Patent
active
050219936
ABSTRACT:
Each register of an internal register unit of a microprocessor has a pair of register cells consisting of first and second cells having the same register address. When one of these cells is selected, the other cell non-selected serves as a "back-up cell" for the selected cell. Each register of the register unit has a flag bit for storing a selector flag representing which cell of the pair of cells of the register is currently selected, and a flag bit for storing a change flag representing whether register information of the register is rewritten after a selected cell is changed between the first and second cells of the register. When the register information is stored in one of the pair of cells currently being selected of a certain register and is to be rewritten with another new information, the other cell of the register is selected to store the new information therein. The original register information is held in the first cell, thereby eliminating necessity of saving the original register information to a main memory at this stage. When the original register information is required again, the original register information can be rapidly restored, by only selecting the first cell again, in the corresponding register without executing save/restore processing between the register unit and the main memory.
REFERENCES:
patent: 3905025 (1975-09-01), Davis et al.
patent: 4181938 (1980-01-01), Suzuki et al.
patent: 4287560 (1981-09-01), Forbes et al.
patent: 4394763 (1983-07-01), Nagano et al.
patent: 4404647 (1983-09-01), Jones et al.
patent: 4410939 (1983-10-01), Kawakami
patent: 4434461 (1984-02-01), Puhl
Aikawa Takeshi
Maeda Ken-ichi
Matoba Tsukasa
Okamura Mitsuyoshi
Saito Mitsuo
Kabushiki Kaisha Toshiba
Kriess Kevin A.
Shaw Gareth D.
LandOfFree
Device for saving and restoring register information does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for saving and restoring register information, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for saving and restoring register information will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1032021