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Differentiate synchronous and asynchronous bus

written 6.9 years ago by nilimazade.mtech • 90

modified 2.8 years ago by binitamayekar ★ 6.6k

computer organization and architecture

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written 2.8 years ago by binitamayekar ★ 6.6k

•   modified 2.8 years ago

Difference between Synchronous and Asynchronous bus

Sr. No.	Topic	Synchronous Bus	Asynchronous Bus
1.	Clock Rate	A synchronous bus works at a fixed clock rate.	An asynchronous bus is not dependent on a fixed clock rate.
2.	Clock Synchronization	Transmitter and receivers both are synchronized with the clock.	Transmitters and receivers are not synchronized with the clock.
3.	Clock Skew	Synchronous Bus affected by clock skew.	Asynchronous Bus not affected by clock skew.
4.	Bus Length	The length of a synchronous bus could be limited to avoid clock-skewing problems.	The length of the asynchronous bus could not be limited.
5.	Bus Protocol	Bus protocol is predetermined in Synchronous Bus.	Bus protocol is not predetermined in Asynchronous Bus.
6.	Physical Distance	Synchronous buses cannot handle longer physical distances.	Asynchronous buses can handle longer physical distances.
7.	Number of Devices	Synchronous buses cannot handle a higher number of devices.	Asynchronous buses can handle a higher number of devices.
8.	Data Transfer	Data transfer takes place in the block.	Data transfer is character-oriented.
9.	Data Bits Transmission	Bits of data are transmitted with the synchronization of the clock.	Bits of data are transmitted at a constant rate.
10.	Character Rate	Character is received at a constant Rate.	Character may arrive at any rate at the receiver.
11.	Speed of Buses	Synchronous Buses are faster.	Asynchronous Buses comparatively slower.
12.	Speed of Data Transmission	Used for high-speed data transmission.	Used for low-speed data transmission.
13.	Overhead	No overhead is present to establish a time reference for each transaction.	Overhead is present to establish a time reference for each transaction.
14.	Finite State machine	Require very less logic to implement Finite State machine.	Require more logic to implement Finite State machine.
15.	Type of Buses	Processor-memory buses are typically synchronous because the devices connected to the bus are fast, are small in number, and are located in close proximity.	I/O buses are typically asynchronous because many peripherals need only slow data rates and are physically situated far away.

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