Boots – shoes – and leggings
Patent
1994-09-16
1997-08-05
Bowler, Alyssa H.
Boots, shoes, and leggings
395469, 395470, 395471, 395472, 395869, 395507, 395515, 3642473, 3642525, 3642597, 364DIG1, G06F 1500
Patent
active
056551355
ABSTRACT:
In a computer system, especially a microcontroller, a circuit for protecting hardware-modifiable status bits during a read-modify-write operation, which circuit is relatively simple to implement yet operates well and does not require an undue amount of die real estate to implement. The circuit comprises means for storing information representing whether a hardware-modifiable status bit has been updated during a read-modify-write operation, and means to prevent over-writing of the status bit during the write portion of the read-modify-write cycle when the stored information is detected. The means for storing the information comprises a latch set into its first state whose output indicates whether the first state exists. That output is connected to logic circuitry which blocks the rewrite portion of the read-modify-write operation from changing a hardware-modified bit set during that cycle.
REFERENCES:
patent: 4958378 (1990-09-01), Bell
patent: 5185859 (1993-02-01), Guttag et al.
patent: 5235543 (1993-08-01), Rosen
patent: 5276800 (1994-01-01), Wada
Birns Neil E.
Goodhue Gregory K.
Ostler Farrell L.
Roy Santanu
Sholander Kevin A.
Bowler Alyssa H.
Nguyen Dzung C.
Philips Electronics North America Corporation
Wieghaus Brian J.
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