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What is the difference between synchronous and asynchronous?

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2012-09-17 20:41:02
2012-09-17 20:41:02

Sychronous transmission does not add start & stop bits at the beginning and end each byte transmitted for sending data segments while Asychronous transmission uses start & stop bits which are added at the start & end of data blocks.

Sychronous transmission provides 64 or 128 Kbps speed but

asychronous transmission provides 38.4 Kbps speed.

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1. Syncrhonous bus includes clock in control lines whereas asynchronous bus is not clocked. 2. the devices which need to be connected by synchronous bus should be at same speed whereas an asynchronous bus may connect many devices with varying speeds. 3. A fixed protocol is defined to communicate using synchronous bus which is relative to the clock. An asynchronous bus uses handshaking protocol.


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synchronous - the transmitter must send a separate clock signal to keep the receiver synchronized with it to successfully receive the dataasynchronous - self synchronizing, the receiver is able to synchronize with the data as it is received without a separate clock signal also being sent from the transmitter to the receiver


synchronous is faster. beacause in asynchronous counter all the flipflops don't have the same CP.So there's a propagation delay.On the other hand synchronous counter has same CP to all the flipflops.So there is less propagation delay than asynchronous counter.For this Synchronous Counter is faster.



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