System and method for monitoring the validity of circulating poi

Details System and method for monitoring the validity of circulating poi System and method for monitoring the validity of circulating poi

1992-07-24

1995-02-07

Gossage, Glenn

Static information storage and retrieval

Magnetic bubbles

Guide structure

395400, 365 73, 365221, 370 60, 370 941, 364DIG1, G06F 1200, H04Q 1104, G11C 1900, G11C 2100

Patent

active

053882385

ABSTRACT:
A system and method are described for enforcing the validity of circulating pointers stored in a pointer FIFO (first-in-first-out) memory. One or more target pointers are generated and compared to circulating pointers. If a pointer does not circulate through the system within a pre-specified time, then a pointer has been lost and an error is reported. If a circulating pointer matches a target pointer, it is suppressed by being removed from the set of circulating pointers. Another timer is then set to determine whether further circulating pointers match a target pointer. If so, then multiple pointers to the same location are present and all duplicate pointers are suppressed. After expiration of the second time, the target pointers are added to the set of circulation pointers. This process repeats with new target pointers, so that the validity of the set of circulating pointers is verified.

REFERENCES:
patent: 4751697 (1988-06-01), Hunter et al.
patent: 5027326 (1991-06-01), Jones
patent: 5027330 (1991-06-01), Miller
patent: 5150463 (1992-09-01), Ward et al.
patent: 5224093 (1993-06-01), Denzel et al.
patent: 5233603 (1993-08-01), Takeuchi et al.

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