System and method for stabilizing asynchronous state machines

Details System and method for stabilizing asynchronous state machines System and method for stabilizing asynchronous state machines

G - Physics

06

F

341/112

G06F 9/22 (2006.01) G05B 19/04 (2006.01) G05B 19/045 (2006.01) G06F 9/38 (2006.01)

Patent

CA 1211540

SYSTEM AND METHOD FOR STABILIZING ASYNCHRONOUS STATE MACHINES ABSTRACT OF THE DISCLOSURE To prevent a race in an asynchronous state machine branching from one state to either of two others, depending on which of two control signals arrives first, one of the signals is latched in the state just ahead of the branching state. The branching then takes place in the branching state upon arrival of the other signal but in a direction de- termined by the value of the latched signal. If the latched value indicates a wrong order of arrival, the machine re- leases the original latched value and latches an updated value of the one signal and returns to the branching state. The looping, with unlatching and relatching, contunues until the latched value causes branching to take place in the proper direction. -26-

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