Hunterabout563

I don't know if “anyone” can do it, but anyone who is taking a course where that is a homework assignment is expected to be able to do it. So, what is the first step?

1. I was trying to display 7-segment LED on MDA-8086 kit, but I am stuck at calculating the hexadecimal values for respective digits. I have the code with me, but I don't understand how it actually works. For example, 0 is represented by hexadecimal value 0xc0 I guess. I am wondering, how the values have been calculated here?
2. Hello, this my first post in the forum. I am using Project Navigator ver. I am trying to simulate a hexadecimal to 7-segment decoder i.e. Convert a 4-bit hexadecimal number (input) to the appropriate 7-segment code (output). Here is the Verilog Module: `timescale 1ns / 1ps module hex7seg(.
3. Hexadecimal seven segment display verilog. 4bit number to seven segment. Latch generation warning in Verilog 8-bit processor code. Will latches occur in.

Today seven segment displays are widely used in almost all electronic circuits. It can display number from 0 to 9 and some characters. In this display 7 segments of LED is arranged such as it can display these information. Each segment is denoted by small letters. One terminal of all those LED is common, so it can be of two types, common anode and common cathode. Arrangement of segments and both types of displays are mentioned in figure below.

This is a common anode 7-segment display. In this display anode of all LED is common and it is connected to positive voltage. Cathode of all LED is responsible to display numbers or some alphabet. we give 0 volt to a particular cathode according to what we want to display.

This is a common cathode 7-segment display. In this display cathode of all LED is common and it is connected to zero voltage. Anfode of all LED is responsible to display numbers or some alphabet. we give positive voltage to a particular Anode according to what we want to display.

Now, if we have to display 0 on the display then we will keep the ‘g’ segment off and other segment on. We want to design a circuit which will take four binary inputs and print hexadecimal number equivalent to that binary number. This circuit is called seven segment hex decoder. There are 16 digits in hexadecimal number which are 0-9 numbers and A-F alphabets. We will use common cathode display. See this table.

7-segment HEX decoder truth table

7-segment HEX decoder circuit will turn on and off the segment for displaying a particular information. Here in this table ‘1’means positive voltage and ‘0’ means 0 volt. We are using a common cathode 7-segment display so ‘1’ means a particular segment is on and ‘0’ means a particular segment is off.

We can design the whole circuit by creating Boolean expression and circuit diagram one by one for each segment.

1. For segment ‘a’

Equation for this table is, a(A,B,C,D) = Σ(0,2,3,5,6,7,8,9,10,12,14,15)

K-map for this equation –

Boolean expression for segment a= AB’C’ + A’BD + AD’ + A’C + BC + B’D’.

Circuit diagram for segment a –

2. For segment ‘b’

Equation for segment b is, b(A,B,C,D) = Σ(0,1,2,3,4,7,8,9,10,13)

K-map for this expression –

Boolean expression, b = A’C’D + A’CD + AC’D + B’C’ + B’D’

Logic diagram –

3. For segment ‘c’

Equation for segment c is, c(A,B,C,D) = Σ(0,1,3,4,5,6,7,8,9,10,11,13)

K-map for this expression –

Boolean expression, c = A’C’ + A’D + C’D + A’B + AB’

Logic diagram –

4. For segment ‘d’

Equation for segment d is, d(A,B,C,D) = Σ(0,2,3,5,6,8,9,11,12,13,14)

K-map for this expression –

Boolean expression, d = A’B’D’ + B’CD + BC’D + BCD’ + AC’

7 Segment Hex Code Chart

Logic diagram –

5. For segment ‘e’

Equation for segment e is, e(A,B,C,D) = Σ(0,2,6,8,10,11,12,13,14,15)

K-map for this expression –

Boolean expression, e = B’D’ + CD’ + AC + AB

Logic diagram –

6. For segment ‘f’

Equation for segment f is, f(A,B,C,D) = Σ(0,4,5,6,8,9,10,11,12,14,15)

K-map for this expression –

Boolean expression, f = A’BC’ + C’D’ + BD’ + AB’ + AC

Logic diagram –

7. For segment ‘g’

Equation for segment g is, g(A,B,C,D) = Σ(2,3,4,5,6,8,9,10,11,13,14,15)

K-map for this expression –

Common Cathode 7 Segment Hex Code

Boolean expression, g = A’BC’ + B’C + CD’ + AB’ + AD

7 Segment Hex Code Lookup

Logic diagram –

7 Segment Hex Code Finder

After combining circuits of all segments we will get complete 7-segment HEX decoder circuit.