Tools

Digital Comparator            

Procedure

  • To draw any diagram in the simulator please follow the manual given in manual section.
  • Step 1. Design a one bit comparator.
  • A one bit comparator has been designed in the simulator using basic ‘AND’, ‘NOT’ and ‘NOR’ gate as below.

where

188, 189: Input Bits

190 high means A < B,

191 high means A = B,

192 high means A > B

  • Save this as a component say 1BIT-CMP.

  • Step 2. Design 4 bit comparator

    • A> Design a 4 input ‘AND’ gate like below.

    • B> Save it as a component say 4IN-AND

    • C> Design a 4 input ‘OR’ gate like below. This has used one 3 input ‘OR’ gate designed before and a basic ‘OR’ gate readily available in the simulator.

    • D> Save it as a component say 4IN-OR.

    • E> Now design a 4 bit comparator with the help of four 1 bit comparator, one 4 input ‘AND’ gate and two 4 input ‘OR’ as shown below.

1, 26, 51, 76: 1BIT-Comparator

120, 144: 4 Input-OR

101: 4 input-AND

Number1: 285 (LSB), 286, 287, 288 (MSB)

Number2: 289 (LSB), 290, 291, 292 (MSB)

293 is high: Number1 < Number2

294 is high: Number1 = Number2

295 is high: Number1 > Number2

Manual

  • Follow the below manual and perform the experiment