Question

1) Task 1: FIFO buffer-based I/O interface module with its interface connections to the CPU from one side and to an Input device (in the form of 8 switches) and an output device (in the form of 8 LEDs) from the other side.

USING LOGISIM

Answer 1

FIFO buffer-based I/O interface module with its interface connections to the CPU from one side and to an Input device (in the form of 8 switches) and an output device (in the form of 8 LEDs) from the other side.

USING LOGISIM:-

I/0 Interface Module and Input/Output devices: The I/O interface module is a FIFO buffer of size 4 x 8. This means that it has 4 registers each with 8 bits. It works in the same way as the buffer studied in chapter 11. The I/O interface module can control the input-output data transfer operations by the shown control signals, such as input ready, output ready, insert, and delete.

The CPU is connected to the input and output devices via the I/O interface modules. The figure shows the data lines and control lines used in the connection.

CPU

Status Signals:

(A) bits of machine instructions including opcode, indirect bit, and address,

(B) status flags such as Z, I, N, S, FGI and FGO. Control Unit Data Unit (timing circuit, decoders, logic circuit, etc.)

Control Signals:

(A) register load, register increment, register clear,

(b) memory read, memory write,

(C) ALU operation selection, etc.