What is common bus system using multiplexer?
The bus consists of 4×1 multiplexers with 4 inputs and 1 output and 4 registers with bits numbered 0 to 3. There are 2 select inputs S0 and S1 which are connected to the select inputs of the multiplexers.
What is bus transfer explain with multiplexer?
A common bus can be generated using a multiplexer. It facilitates in choosing the source register to place the binary data on the bus. The bus register has input and output gating controlled by control signals. The diagram demonstrates the input and output gating of registers.
What are the methods to construct a common bus system?
A bus system can also be constructed using three-state gates instead of multiplexers. The three state gates can be considered as a digital circuit that has three gates, two of which are signals equivalent to logic 1 and 0 as in a conventional gate. However, the third gate exhibits a high-impedance state.
What is common bus Explain with diagram?
A basic computer has 8 registers, memory unit and a control unit. The diagram of the common bus system is as shown below….Various Registers:
| Abbreviation | Register name |
|---|---|
| AC | Accumulator |
| DR | Data register |
| PC | Program counter |
| AR | Address register |
How many multiplexers are there in a bus?
If there are 8 registers of 16 bits each, then we need 16 multiplexers, each of which is an 8 : 1 multiplexer to create the 16 bit data bus.
How many minimum multiplexers are required to configure a bus?
What is common bus architecture?
The lines from the common bus are connected to the inputs of each register and the data inputs of the memory. The particular register whose LD (load) input is enabled receives the data from the bus during the next clock pulse transition. The memory receives the contents of the bus when its write input is activated.
What are the advantages of using a common bus?
Advantages
- Versatility:
- New devices can be added easily.
- Peripherals can be moved between computer.
- Low Cost:
- A single set of wires is shared in multiple ways.
What is the advantage of common bus system?
By using a single register for the address, we eliminate the need for an address bus that would have been needed otherwise. The content of any register can be specified for the memory data input during a write operation. Similarly, any register can receive the data from memory after a read operation except AC .
How many multiplexers will be required for making common bus for connecting 16 bit registers?
16 multiplexers
If there are 8 registers of 16 bits each, then we need 16 multiplexers, each of which is an 8 : 1 multiplexer to create the 16 bit data bus.