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Asynchronous Data Transfer between two independent units requires that control signals be transmitted between the communicating units so that the time can be indicated at which they send data.This asynchronous way of data transfer can be achieved by two methods:
One way is by means of strobe pulse which is supplied by one of the units to other unit.When transfer has to occur.This method is known as “Strobe Control”.
Another method commonly used is to accompany each data item being transferred with a control signal that indicates the presence of data in the bus.The unit receiving the data item responds with another signal to acknowledge receipt of the data.This method of data transfer between two independent units is said to be “Handshaking”.
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