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Write VHDL code for 3:8 decoder with active low truth table
written 5.1 years ago by
teamques10
★ 64k
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modified 2.0 years ago
by
sagarkolekar
★ 11k
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189views
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written 2.0 years ago by
sagarkolekar
★ 11k
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| X(2) | X(1) | X(0) | Y(0) | Y(1) | Y(2) | Y(3) | Y(4) | Y(5) | Y(6) | Y(7) |
|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 0 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 |
| 0 | 1 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 |
| 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 |
| 1 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 |
| 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
| 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
Entity decoder is port ( x : in std_logic_vector (2 down too)
Y : out std_logic_vector ( 0 down to 7 )
en : in std_logic) ;
End decoders;
Architecture behavioral of decoder is signal Y 1 : std_logic_vector (7 down to 0) ;
Begin Y1 < = “0111 111” when z = “ 000 “ else
“10111111” when x = “001” else
“11011111” when x = “010” else
“11101111” when x = 011” else
“11110111” when x = “100” else
“11111011” when x = “101” else
“11111101” when x = “110” else
“11111110” when x = “111” else
“11111111” when others;
Y < = y, when en = ‘0’ else “1111 1111” ;
End behavioral.
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