How many tri state buffers are required to construct a common bus for 4 registers of 8 bits each

To construct a common bus for four registers of n bits each using three-state buffers, we need n circuits with four buffers in each as shown in Fig. 4-5. Each group of four buffers receives one significant bit from the four registers.

1. How many multiplexers are there in bus?
2. How many multiplexers will be required for making common bus for connecting 16 bit registers?
3. What are three states of buffer?
4. How many tri-state buffers are required to construct a common bus?
5. What is the need of common bus design a bus with 4 register with 8 bit each?
6. How a common bus system can be constructed?
7. What is the need of common bus?
8. What size of multiplexers are needed to construct a bus system to transfer 8 bit data from one of four 8 bit registers?
9. What is the size of the common bus connecting the different registers?
10. What is the function tri-state buffer?
11. What is tri-state mode?
12. What is tri-state TTL?

How many multiplexers are there in bus?

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.

How many multiplexers will be required for making common bus for connecting 16 bit registers?

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.

What are three states of buffer?

The tristate buffer, shown in Figure 2.40, has three possible output states: HIGH (1), LOW (0), and floating (Z).

How many tri-state buffers are required to construct a common bus?

The outputs of four buffers are connected together to form a single bus line.

What is the need of common bus design a bus with 4 register with 8 bit each?

Common Bus System (4-bit, 8-bit)

Generally, computers use many registers for different purposes. We need to transfer the data and instruction between these registers. So, To transfers the data between the registers, the common bus system is used .

How a common bus system can be constructed?

A bus can be constructed using multiplexer which enable a sets of registers to share a common bus for data transfer. The select lines S1 and S0 indicate which of four register will have its contents transferred to the bus.

What is the need of common bus?

The basic computer has eight registers, a memory unit, and a control unit . Paths must be provided to transfer information from one register to another and between memory and registers. A more efficient scheme for transferring information in a system with many registers is to use a common bus. ...

What size of multiplexers are needed to construct a bus system to transfer 8 bit data from one of four 8 bit registers?

For instance, a common bus for eight registers of 16 bits each requires 16 multiplexers, one for each line in the bus. Each multiplexer must have eight data input lines and three selection lines to multiplex one significant bit in the eight registers.

What is the size of the common bus connecting the different registers?

Various Registers:

4 registers DR, AC, IR and TR have 16 bits and 2 registers AR and PC have 12 bits.

What is the function tri-state buffer?

The Tri-state Buffer is used in many electronic and microprocessor circuits as they allow multiple logic devices to be connected to the same wire or bus without damage or loss of data. For example, suppose we have a data line or data bus with some memory, peripherals, I/O or a CPU connected to it.

What is tri-state mode?

A three-state, or Tri-State™, output has three electrical states: One, zero, and "Hi-Z," or "open." The hi-Z state is a high-impedance state in which the output is disconnected, leaving the signal open, to be driven by another device (or to be pulled up or down by a resistor provided to prevent an undefined state).

What is tri-state TTL?

Tri-state gates have additional circuitry via which the gate outputs can be enabled or disabled. This is very useful in digital systems where devices communicate via common wires called busses. Only one device can talk at a time; the others are disabled. Figure 9 shows a tri-state TTL inverter.