Question

Design a bus system for the digital system based on the following requirements:

1- The sending registers a group of 4 registers (A-B-C) each of them are 4bits.
2-The destination registers are 2 and is 4bits in size.
3- You must use 3-state buffer in your design
4- design and draw

Answer 1

The design includes a 4-bit wide data bus, sending registers with 3-state buffers, and two destination registers controlled by a multiplexer. Control logic is required to manage data routing efficiently and avoid conflicts.

Step-by-step explanation:

To design a bus system for a digital system based on the provided requirements, we need to consider the following elements: There are three sending registers (A, B, C), each 4 bits in size. There are two destination registers, each 4 bits as well. A 3-state buffer should be used to control data flow on the bus.

The suggested design will include a 4-bit wide data bus that connects all registers. Each register (A, B, C) will have a corresponding 3-state buffer that controls whether the register is sending data onto the bus or receiving it. The outputs of these 3-state buffers are connected to the data bus.

The destination registers will require a control mechanism to ensure that only one register receives data from the bus at a given time to avoid conflicts. This can be achieved using a multiplexer controlled by a select signal that chooses which destination register will be connected to the data bus. The control logic will determine the state of the 3-state buffers and the multiplexer selections to route data accordingly from the sending registers to the destination registers.

Answer 2

The design of the bus system includes a 4-bit bus with 3-state buffers connecting sending registers A, B, and C to the destination registers. Decoder logic within a control unit manages the enabling of buffers to prevent bus contention. The design ensures clean data transfer by connecting only one sending register to the destination registers at any given time.

Step-by-step explanation:

To design a bus system for a digital system with the specified requirements, we must consider how to effectively connect the sending registers (labelled A, B, C), which are 4 bits each, to the two destination registers, which are also 4 bits in size, using 3-state buffers.

The 3-state buffers will control the flow of data and ensure that only one register sends data to a destination at any given time to prevent bus contention.

In this design, a 4-bit bus is sufficient to connect all the registers since each register is 4 bits in size. The sending registers A, B, and C will each be connected to this bus through their respective 3-state buffers. The destination registers will receive data from this bus.

Control signals will manage which 3-state buffer is active at any moment, allowing one sending register to communicate with the destination registers without interference from the others.

To complete this design, a control unit with decoder logic is necessary. The decoder will take input signals that select which sending register (A, B or C) is to be connected to the bus.

When the control unit activates one of the sending registers, its 3-state buffer will be enabled, connecting it to the bus, while the buffers of the other registers remain in a high-impedance state (disabled), thus preventing bus contention and allowing for clean data transfer to the destination registers.