Digital Logic Design

Digital Logic Design 

Here we Concentrates on Simple Logic circuits that can be designed in real world or (as here) in a Program called MMLogic . We use simple screen shots as Tutorials here .

For help Email to : Monsterkillu@gmail.com 

mm Logic is (now) a Freeware software for learning and implementing Digital Logic circuits 

more easily than you thought. It has got a simple interface , pretty low size , Easy to check & simulate components.

It has all the gates , Counters , ALU , memory , files , 7 segment display etc.

You can download this at mm Logic / Softronix Website

Copyright 1996 Softronics 

 Tutorial Tips

• Learn as you build Logic circuits
• Make as many Errors as possible
• Use nodes carefully
• Use step simulation if seems appropriate.
• Familiarize components first before starts building.
• 
  

Here is a Fulladder implemented using basic gates in mmlogic.

sum = a xor b xor cin and Carry = ab + (a xor b) cin

This is just a cascading of "4 " above given Full adder and connecting the 'carry out' to 'carry in' of the second FA.

In the second 7 segment display only '0' or '1' is needed . So rest are grounded.

It may look so complicated. Use "Nodes" Logically to improve wirings.

Here is a Ring COunter or " SHift register Counter" . I've got trouble with the 'level triggering' , 

so i choose "edge triggering" for D flip flop.

Push buttons with initial states 1 is used for clearing & setting 1st Preset.

Traffic Light

This Traffic Light just Displays the RED for 5 seconds , Green for 3 seconds and yellow for 2 seconds . Bcd adder is used with 1second Oscillator. Change speed to 1hz from Simulate -> Setup menu.

MEMORY IN mmLOGIC

mm Logic Provides 8/16 bit memory ,in both READING and WRITE Modes . Quite useful for Bigger circuits .

Here i used it as a 4 bit memory (in 8 bit mode) . When W (write pin) is high , data is written into memory (Each time you press , E symbol becomes one , enabling Write signal. )  To read , set W to 0 and set the ADDRESS. Simple.

Got Bigger Ones ?

Here we have shown you only basic things by which many great ckts ( a full computer ) can be build.

If you have got Logic and little bit of Imagination You can also do

great Logic circuits to Learn , or just for fun.

Send the '.lgi' files or screenshots to 'monsterkillu@gmail.com' and we will publish it here.