Application

Design a password$-$verifying circuit using the following components in the Proteus simulation environment. The design should work according to the rules outlined below.

Components:

One $8086$ Microprocessor

Three $74273$ Octal D$-$Type Flip$-$Flops

One $74154$ Demultiplexer

One $8255$ PPI

Eight Buttons $($Switches$)$

One Common Anode $7-$Segment Display

One OR Gate

Two NOT Gates

Resistors:

Pull$-$down resistors $(100)$ for the $8$ switchesA pull$-$up resistor $(10$ k$)$ for the reset switch

Requirements:

Port Addressing:

The port addresses of the $8255$ will be dynamically determined based on the student ID$.$Address Calculation:

Base address: $100$H $+8*($StudentID $\%200)$Ports:

Port A: Base address.Port B: Base address $+2.$Port C: Base address $+4.$Control Port: Base address $+6.$

Using this method, each student$$s circuit will be configured with a unique port address.

Input and Password Verification:

$8$ Switches $($Buttons$)$: Connected to the input port. Manual inputs will be made using these switches, each acting as a single$-$bit input.Password Check: The entered input will be compared with a password determined by the microprocessor.

If the input is correct:

The $7-$segment display will light up all LEDs to show the number $"8."$

If the input is incorrect:

The $7-$segment display will remain off with no LEDs lit.

Reset Button:

A reset button will be connected to the $4$th pin of the input port.Negative Triggering: The reset process will be activated not when the button is pressed but when it is released.During the reset process:

The $7-$segment display will reset, turning off all LEDs.The circuit will begin waiting for new input.

Algorithm:

Input Check:

The input provided via switches is read by the microprocessor.The entered value is compared with the preset password.

Password Match:

If correct:

The $7-$segment display shows the number $"8."$

If incorrect:

No LEDs light up on the $7-$segment display.

Reset:

The process is activated when the reset button is released.All LEDs on the $7-$segment display turn off, and the system waits for new input.

Reminders:

$7-$Segment Display:

Ensure the connections to the microprocessor are correct and verify that the output port works in active$-$high mode.

Reset Process:

The operation is triggered by releasing the reset button, not by holding it down.

Simulation Testing:

Verify all connections and the reset mechanism in the Proteus environment.