Method and apparatus for determining the status of a shared reso

Details Method and apparatus for determining the status of a shared reso Method and apparatus for determining the status of a shared reso

1995-12-07

1998-03-17

Harvey, Jack B.

395551, 395674, 395880, G06F 112, G06F 506

Patent

active

057297657

ABSTRACT:
A method and apparatus for determining the status of a resource shared by multiple subsystems operating in mutually asynchronous clock domains apply a one-bit counter for each subsystem and synchronize the value of each such bit counter with all asynchronous clocks. Each subsystem exclusive-ORs the value of each bit counter to generate an availability status for the shared resource. System delays caused by synchronization are minimized, and circuit design and proof of correctness at the design stage are simplified.

REFERENCES:
patent: 4821220 (1989-04-01), Duisberg
patent: 4847754 (1989-07-01), Obermarck et al.
patent: 5524270 (1996-06-01), Haess et al.

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