Four state token passing alignment fault state circuit for micro

Details Four state token passing alignment fault state circuit for micro Four state token passing alignment fault state circuit for micro

1995-06-07

1997-01-21

Beausoliel, Jr., Robert W.

39518502, G06F 1130

Patent

active

055967175

ABSTRACT:
This invention employs a token passing structure for controlling alignment fault generation. This alignment fault state circuit stores one of four states corresponding to whether the operating system permits address misalignment fault generation and whether the application program requests such address misalignment fault generation. If the token is present in a particular latch, then the corresponding state is active. If the token is absent, then the corresponding state is inactive. The presence of the token in a predetermined one of the four states causes a fault gate qualifier signal to be active permitting fault generation on address misalignment. Absence of the token from that state causes the fault gate qualifier signal to be inactive prohibiting fault generation on address misalignment. This structure efficiently implements address misalignment fault control by means of token location. Every token location is accessible at every privilege level. An additional instruction not previously supported by Intel microprocessors and Intel compatible microprocessors permits the application program access to the individual token locations and thus to all the permitted states.

REFERENCES:
patent: 4488228 (1984-12-01), Crudele et al.
patent: 5201043 (1993-04-01), Crawford et al.
patent: 5278840 (1994-01-01), Cutler et al.
patent: 5325520 (1994-06-01), Nguyen et al.
patent: 5455909 (1995-10-01), Blomgren et al.

Affiliated with

Also associated with

Rating

Four state token passing alignment fault state circuit for micro does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Four state token passing alignment fault state circuit for micro, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Four state token passing alignment fault state circuit for micro will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2331850