Decoders Wilfrid Laurier University
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1 Decoders Wilfrid Laurier University Wilfrid Laurier University January 27, 2012
2
3 A decoder usually converts one type of input pattern into a corresponding output pattern.
4 A decoder usually converts one type of input pattern into a corresponding output pattern. In principle, virtually any combinational logic circuit could be thought of as some kind of decoder.
5 O7 I3 I2 I1 I0 O6 O5 O4 O3 O2 O1 Here s a generic decoder.
6
7 A common type of decoder is used to take a numeric input, and produce outputs which will drive some sort of display.
8 A common type of decoder is used to take a numeric input, and produce outputs which will drive some sort of display. A binary coded decimal, or BCD number, is simply a four bit value representing numbers from 0 to 9.
9 A common type of decoder is used to take a numeric input, and produce outputs which will drive some sort of display. A binary coded decimal, or BCD number, is simply a four bit value representing numbers from 0 to 9. (It s the same as hexadecimal, except that the combinations from A to F are not valid.)
10 A common type of decoder is used to take a numeric input, and produce outputs which will drive some sort of display. A binary coded decimal, or BCD number, is simply a four bit value representing numbers from 0 to 9. (It s the same as hexadecimal, except that the combinations from A to F are not valid.) A 7 segment display uses 7 LEDs in the shape of the number 8 to show any digit from 0 to 9, depending on which segments are lit.
11 A common type of decoder is used to take a numeric input, and produce outputs which will drive some sort of display. A binary coded decimal, or BCD number, is simply a four bit value representing numbers from 0 to 9. (It s the same as hexadecimal, except that the combinations from A to F are not valid.) A 7 segment display uses 7 LEDs in the shape of the number 8 to show any digit from 0 to 9, depending on which segments are lit. BCD to 7 segment conversion is a good example of the use of a decoder.
12 b I3 I2 I1 I0 a f g e d c Here s a BCD to 7 segment decoder, shown with a 7 segment display.
13 b I3 I2 I1 I0 a f g e d c Operation for the input number 0
14 b I3 I2 I1 I0 a f g e d c Operation for the input number 1
15 b I3 I2 I1 I0 a f g e d c Operation for the input number 2
16 b I3 I2 I1 I0 a f g e d c Operation for the input number 3
17 b I3 I2 I1 I0 a f g e d c Operation for the input number 4
18 b I3 I2 I1 I0 a f g e d c Operation for the input number 5
19 b I3 I2 I1 I0 a f g e d c Operation for the input number 6
20 b I3 I2 I1 I0 a f g e d c Operation for the input number 7
21 b I3 I2 I1 I0 a f g e d c Operation for the input number 8
22 b I3 I2 I1 I0 a f g e d c Operation for the input number 9
23 For a BCD to 7 segment decoder, hexadecimal inputs from A to F are not valid, so the behaviour in this example has not been specified.
24 For a BCD to 7 segment decoder, hexadecimal inputs from A to F are not valid, so the behaviour in this example has not been specified. There may be additional inputs on a decoder such as this to do things like turn all of the segments on or off for testing purposes.
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