Distinguish between the following buses given examples and their functionsSynchronous busesAsynchronous busesALE buses
Question
Distinguish between the following buses given examples and their functions
- Synchronous buses
- Asynchronous buses
- ALE buses
Solution
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Synchronous Buses: These are types of data buses that operate at a specific clock speed. They are synchronized with the system clock. The data transfer rate is high because they operate at a fixed rate, which is determined by the system clock. An example of a synchronous bus is the front-side bus (FSB) in a computer, which connects the CPU to the system memory and the Northbridge chip.
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Asynchronous Buses: These buses do not operate at a fixed clock speed. Instead, they use handshaking techniques to control data transfer, which means they can operate at a variety of speeds. This makes them more flexible than synchronous buses, but also slower. An example of an asynchronous bus is the Universal Serial Bus (USB), which can connect a variety of devices to a computer at different speeds.
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ALE Buses: ALE stands for Address Latch Enable. These are specific to microprocessors like the Intel 8085. The ALE signal is used to demultiplex the address-data signal of the bus. The bus carries both address and data signals, and the ALE signal is used to separate these out. When the ALE signal is active, the bus is carrying an address signal; when it is not active, the bus is carrying a data signal. This allows for more efficient use of the bus.
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