Method and apparatus for coupling signals between

专利名称：Method and apparatus for coupling signals

between two circuits operating in differentclock domains

发明人：Troy A. Manning申请号：US09447075申请日：19991122公开号：US06366991B1公开日：20020402

专利附图：

摘要：A coupling circuit for coupling a first signal generated in a first circuit operatingin a first clock domain to a second circuit operating in a second clock domain. The

coupling circuit includes a first gate for coupling the first signal to a first logic circuitunless the coupling circuit has already applied a signal to the second circuit. The firstlogic circuit includes a pair of second gates that are enabled by respective rising andfalling edges of the first clock signal. Thus, each of the second gates generates an outputsignal on respective transitions of the first clock signal as long as the first gate iscoupling the first signal to the first logic circuit. The first logic circuit also includes a pairof latches coupled to respective outputs of the second gates. Each of the latches is setby its respective second gate generating the output signal. The second logic gates arecoupled to a second logic circuit having a pair of third gates that are enabled byrespective rising and falling edges of the second clock signal. Thus, each of the secondgates generates an output signal on respective transitions of the second clock signal ifthe latch to which it is connected is generating an output signal. The output signal is alsoused as the reset signal to disable the first gate and reset the latches. Since the outputsignal is generated on the first transition of the first clock signal after the first signal isapplied to the coupling circuit, the coupling circuit generates a single output signal that issynchronized to the second clock signal.

申请人：MICRON TECHNOLOGY, INC.

代理机构：Dorsey & Whitney LLP

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