What are the different kinds buses? How and why de-multiplexing of buses is carried out in 8085.

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Suresh Chand · Accepted Answer

In a computer system, a bus is a communication pathway that transfers data between different components such as the processor, memory, and input/output devices. Here are the different kinds of buses in a computer system: Address Bus: This is a unidirectional bus used by the CPU to send memory addresses to the memory or input/output devices. The width of the address bus determines the maximum amount of memory that the CPU can access. Data Bus: This is a bidirectional bus used to transfer data between the CPU, memory, and input/output devices. The width of the data bus determines the maximum amount of data that can be transferred in a single operation. Control Bus: This is a bidirectional bus used to control the flow of data and signals between the CPU, memory, and input/output devices. It includes signals for read and writes operations, interrupts requests, and clock signals. Each type of bus has its own specifications, such as bus width, clock speed, and data transfer rate, which determine its performance and compatibility with different components. The design of the bus architecture is a critical factor in the overall performance and efficiency of a computer system. In the 8085 microprocessor, de-multiplexing of buses is carried out to separate the address bus and data bus. The address bus and data bus share the same pins on the microprocessor, but they are used for different purposes. The address bus is used to specify the memory location or input/output port that the processor wants to access. It is a unidirectional bus, which means that data flows only in one direction, from the processor to the memory or input/output port. The address bus consists of 16 lines, A0-A15, which provide a maximum of 64 kilobytes of memory and input/output space. The data bus, on the other hand, is bidirectional and is used to transfer data between the processor and memory or input/output devices. It consists of 8 lines, D0-D7, which can transfer a byte of data in one operation. De-multiplexing of buses is carried out using a latch or flip-flop circuit, which separates the address and data signals. The latch circuit receives the address and data signals from the processor and stores the address signals temporarily, while allowing the data signals to pass through to the memory or input/output device. The reason for de-multiplexing the buses is to increase the speed and efficiency of data transfer. By separating the address and data signals, the processor can access memory or input/output devices more quickly and efficiently, without having to wait for the data to be sent or received. In summary, de-multiplexing of buses is carried out in the 8085 microprocessor to separate the address and data signals, which allows for faster and more efficient data transfer between the processor and memory or input/output devices.

What are the different kinds buses? How and why de-multiplexing of buses is carried out in 8085.

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What are the different kinds buses? How and why de-multiplexing of buses is carried out in 8085.

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