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Differentiate synchronous and asynchronous bus
written 6.3 years ago by gravatar for nilimazade.mtech nilimazade.mtech • 90 modified 2.2 years ago by gravatar for binitamayekar binitamayekar ★ 6.4k
computer organization and architecture
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written 2.2 years ago by gravatar for binitamayekar binitamayekar ★ 6.4k •   modified 2.2 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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