Asynchronous vs synchronous bus

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In an asynchronous bus, each bus cycle is sequenced by request and acknowledgment signals. To perform a bus cycle, the transmitter drives the data onto the bus and then asserts the request signal Req. Upon seeing the request signal, the receiver samples the data off the bus and asserts an acknowledge signal Ack to indicate that the data transfer is complete. Upon receiving the acknowledge signal, the transmitter turns its driver off, freeing the bus for the next transfer .