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# sa999000

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Encoder decoder
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# sa999000

abdulmajeed241el

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### sa999000

1. 1. Keyboard
2. 2. THE COMBINATIONAL LOGIC CIRCUITS ENCODER
3. 3. Some information about the Encoder: # An encoder has a number of input lines, only one of which input is activated at a given time and produces an N-bit output code, depending on which input is activated. # An encoder is a combinational logic circuit that essentially performs a “reverse” of decoder functions. # Encoders can also be devised to encode various symbols and alphabetic Letters.
4. 4. Inputs Outputs I 0 I 1 I 2 I 3 I 4 I 5 I 6 I 7 y2 y1 y0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1 1 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 1 0 0 1 0 1 0 0 0 0 0 0 1 0 1 1 0 0 0 0 0 0 0 1 1 1 1 I0 I1 I2 I3 I4 I5 I6 I7 y2 = I4 + I5 + I6 + I7 y1 = I2 + I3 + I6 + I7 y0 = I1 + I3 + I5 + I7 0 8-to-3 Binary Encoder At any one time, only one input line has a value of 1. y2 y1 y0
5. 5. Example (1): Design IC consists of 3 bits and draw its truth table with make clear each output what is equal .
6. 6. Example (2): How many number of outputs if we have 8 inputs , make clear with draw and truth table
7. 7. Exercise: Show how the decimal –to-BCD encoder converts the decimal number 3 into a BCD 1100.
8. 8. The correct solution:
9. 9. Experiment ( Group work) :