# Monthly Archives: March 2015

## Design an Draw a circuit to interface four RAMs of 128 x 8 size and a ROM of 512 x 8 size. 8m Jun2007

Design a circuit to interface four RAMs of 128 x 8 size and a ROM of 512 x 8 size. Draw the memory map for the same. 8m Jun2007 Address lines:- 128 = 128 = 27 512 = 29 Address lines = 16

## Design and draw a 3 x 8 decoder using NOT gates and AND gates and explain its working. 8m Jun2007

Decoder converts one type of coded information to another form. A decoder has ‘n’ inputs and an enable line (a sort of selection line) and 2n output lines. Let us see diagram of 3×8 decoder which decodes a 3 bit information and there is only one output line which gets the value 1 or in… Read More »

## Simplify Boolean function using Karnaugh map method F(A,B,C,D) = Σ(1,2,5,6,7,8,9,11,12,15) Also, draw the corresponding logic circuit diagram. 8m Jun2007

Simplify the following Boolean function using Karnaugh map method F( A ,B , C , D ) = Σ ( 1, 2 , 5 , 6 , 7 , 8 , 9 , 11 , 12 ,15 ) Also, draw the corresponding logic circuit diagram. 8m Jun2007   K-Map for F is: Thus, the simplified equations for F (A,… Read More »