Buses that require handshakes to take place every time the bus is accessed are called asynchronous buses.
What is asynchronous buses?
A bus that connects computer system components and uses self-timing data transfers rather than synchronizing clock signals is known as an asynchronous bus. To let another connected device know that it is ready for a transfer, the connected device will send a request signal.
A synchronous bus runs at a set clock rate, whereas an asynchronous bus' data transfer is independent of a fixed clock. Data transmission devices provide the timing for asynchronous buses.
Thus, it is asynchronous buses.
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