Question

Here, a digital system comprising 3 registers (A, B, C) and an arithmetic unit is shown (left), along with the system’s control circuit (right). The arithmetic unit performs a bitwise OR operation between the contents of registers A and B if the control signal Bit_OR = 1. The result of the bitwise OR operation is readily available in the data bus. For this problem, you have to design a Moore-type control circuit that performs bitwise OR operation between the contents of registers A and C; saves the result in register A. The process is initiated when the input w = 1. The operation should be completed once initiated, regardless of the value of w. Once completed, the "Done" signal should be set high, or Done = 1. If the "in" pin of a register (Ain , Bin, or Cin ) is high, then the corresponding register can save the data available in the data bus. Similarly, any register’s saved data can be made available to the data bus by setting its "out" pin (Aout , Bout, or Cout) high. Draw the state diagram, state assigned table, and the derived circuit with flipflop.

Answer 1

A Moore-type control circuit can be designed to perform a bitwise OR operation between the contents of registers A and C and save the result in register A. The process is initiated when the input w = 1, and the operation should be completed once initiated, regardless of the value of w. Once completed, the 'Done' signal should be set high, or Done = 1.

Step-by-step explanation:

A Moore-type control circuit can be designed to perform a bitwise OR operation between the contents of registers A and C and save the result in register A. The process is initiated when the input w = 1, and the operation should be completed once initiated, regardless of the value of w. Once completed, the 'Done' signal should be set high, or Done = 1.

To design the circuit, we can start by creating a state diagram that represents the different states and transitions of the system. The state diagram will have a state for the initial state, a state for performing the bitwise OR operation, and a state for setting the Done signal high. We can assign binary values to each state and define the inputs and outputs for each state transition.

Next, we can create a state assigned table that assigns the next state and output for each state transition. This table will help us derive the circuit with flip-flops. We can use D flip-flops to store the current state and perform the necessary operations based on the inputs and outputs defined in the state assigned table.

To design a Moore-type control circuit that executes a bitwise OR between the contents of registers A and C, a state diagram is developed, followed by a state assignment table, and then the derived circuit consisting of flip-flops and combinational logic.

Designing a Moore-type control circuit to perform a bitwise OR operation between two digital registers and then storing the result is a sophisticated task that includes several steps. First, a state diagram needs to be created to represent the control circuit's states and transitions. Each state corresponds to a specific control signal configuration that determines the behavior of the system. For instance, one state could enable Aout to place the contents of register A onto the data bus, and another state could enable Bit_OR and Cout to perform the OR operation between A and C. The next step is to assign binary values to these states, creating a state assigned table, which is crucial for encoding the states into the flip-flops of the control circuit.

Once the table is created, the derived circuit can be structured, typically consisting of flip-flops (to store and transition through states) and combinational logic (to decode the state and generate appropriate control signals). The flip-flops could be D-type or J-K, depending on the particular design choices. The circuit would also include logic to set the Done signal once the operation is complete, indicating that register A holds the result of the bitwise OR between A and C.