
Homework Help Stuck on a textbook question or coursework? Cramming for a test and need help understanding something? Post your questions and attempts here and let others help. 

Thread Tools  Display Modes 
#1




Combinational Logic Circuit to convert Excess 3 code into BCD code
I know that 3 = 0000
2 = 0001 1 = 0010 and that 10, 11, 12 are dont care conditions. But how do I implement the Kmap? 
#3




Table ? I dont exactly understand.
3 = 0000 2 = 0001 1 = 0010 (These 3 dont care) 0 = 0011 1 = 0100 2 = 0101 3 = 0110 4 = 0111 5 = 1000 6 = 1001 7 = 1010 8 = 1011 9 = 1100 10 onwards not possible dont care Where do I go from here? 
#5




Hello hitmen,
Set up a 4 variable kmap . The input variables A,B,C,D are the excess3 code bits(starting from 0011 ,which corresponds to A'B'CD) . This is for the first bit of all the output values(which is BCD ). Similarly do it for the other 3 bits which means you will get 4 Kmaps in all 
#6




Quote:
I understand how to do the question already. But how do the examiners know whether your answer is right or wrong since there are so many dont care conditions? Also, how can a student verify his answer? 
#7




Quote:
But yes you are right ,we can have many answers for these type of questions. We try to get the simplified form which uses the minimum number of gates and incase of dontcares just give them the value which reduces the total number of inputs and gates. But i think you can have many answers 
#8




undergradate? so am I.

Tags 
bcd, circuit, code, combinational, convert, excess, logic 
Related Site Pages  
Section  Title  
Worksheet  Boolean algebra  
Worksheet  Memory devices  
Worksheet  Digital display circuits  
Worksheet  Encoders and decoders  
Worksheet  CMOS logic gates  
Worksheet  Digital codes  
Textbook  Encoder : Combinational Logic Functions  
Textbook  Decoder : Combinational Logic Functions  
Textbook  Don't care cells in the Karnaugh map : Karnaugh Mapping  
Textbook  Introduction : Combinational Logic Functions 
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
simplifying logic circuit  promage  Homework Help  5  11122010 07:52 AM 
Circuit to Convert Binary to BCD  Diamond  Homework Help  10  04112009 10:32 AM 
Logic circuit setup, help wanted.  HellTriX  General Electronics Chat  35  07172008 04:55 AM 
How To Convert Binary Code To Bcd And Vise Versa?  transgalactic  Homework Help  6  05082008 04:38 PM 
Design Logic Circuit Help  NandoNando  Homework Help  2  03132008 11:58 PM 
Thread Tools  
Display Modes  

