Patent ID: 6420907
Filing Date: 2002-07-16
Classification: G05B

Abstract:
An apparatus for asynchronously controlling state information within a circuit, comprising:a first conductor that carries a voltage indicating a state of the circuit; a first drive circuit coupled to the first conductor that is configured to drive the first conductor to a first voltage level to indicate a first state; a second drive circuit coupled to the first conductor that is configured to drive the first conductor to a second voltage level to indicate a second state; a condition input that indicates a condition; a second conductor that carries a voltage indicating a second state of the circuit; and a third drive circuit coupled to the second conductor that is configured to drive the second conductor to a first voltage level to indicate a first state; wherein the first drive circuit is configured to drive the first conductor to the first voltage level based upon the condition indicated by the condition input; wherein the third drive circuit is configured to drive the second conductor to the first voltage level based upon the state indicated by the voltage on the first conductor; and wherein the third drive circuit is configured to operate asynchronously without waiting for a system clock signal to change state.