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| library ieee; | |
| use ieee.std_logic_1164.all; | |
| entity multiplex is | |
| port(A, B, S3, S2, S1, S0, enable: in std_logic; Y: out std_logic); | |
| end multiplex; | |
| ARCHITECTURE comportamento OF multiplex IS | |
| signal f : std_logic_vector(15 downto 0); | |
| signal s : std_logic_vector(15 downto 0); | |
| BEGIN | |
| f(0) <= '0'; | |
| f(1) <= A and B; | |
| f(2) <= A AND NOT B; | |
| f(3) <= A; | |
| f(4) <= NOT A AND B; | |
| f(5) <= B; | |
| f(6) <= A xor B; | |
| f(7) <= A OR B; | |
| f(8) <= NOT(A OR B); | |
| f(9) <= A xnor B; | |
| f(10) <= NOT B; | |
| f(11) <= A OR NOT B; | |
| f(12) <= NOT A; | |
| f(13) <= NOT A OR B; | |
| f(14) <= NOT (A AND B); | |
| f(15) <= '1'; | |
| s(0) <= (NOT S3) AND (NOT S2) AND (NOT S1) AND (NOT S0) AND f(0); | |
| s(1) <= (NOT S3) AND (NOT S2) AND (NOT S1) AND (S0) AND f(1); | |
| s(2) <= (NOT S3) AND (NOT S2) AND (S1) AND (NOT S0) AND f(2); | |
| s(3) <= (NOT S3) AND (NOT S2) AND (S1) AND (S0) AND f(3); | |
| s(4) <= (NOT S3) AND (S2) AND (NOT S1) AND (NOT S0) AND f(4); | |
| s(5) <= (NOT S3) AND (S2) AND (NOT S1) AND (S0) AND f(5); | |
| s(6) <= (NOT S3) AND (S2) AND (S1) AND (NOT S0) AND f(6); | |
| s(7) <= (NOT S3) AND (S2) AND (S1) AND (S0) AND f(7); | |
| s(8) <= (S3) AND (NOT S2) AND (NOT S1) AND (NOT S0) AND f(8); | |
| s(9) <= (S3) AND (NOT S2) AND (NOT S1) AND (S0) AND f(9); | |
| s(10) <= (S3) AND (NOT S2) AND (S1) AND (NOT S0) AND f(10); | |
| s(11) <= (S3) AND (NOT S2) AND (S1) AND (S0) AND f(11); | |
| s(12) <= (S3) AND (S2) AND (NOT S1) AND (NOT S0) AND f(12); | |
| s(13) <= (S3) AND (S2) AND (NOT S1) AND (S0) AND f(13); | |
| s(14) <= (S3) AND (S2) AND (S1) AND (NOT S0) AND f(14); | |
| s(15) <= (S3) AND (S2) AND (S1) AND (S0) AND f(15); | |
| Y <= enable and (s(0) OR s(1) OR s(2) OR s(3) OR s(4) OR s(5) OR s(6) OR s(7) | |
| OR s(8) OR s(9) OR s(10) OR s(11) OR s(12) OR s(13) OR s(14) OR s(15)); | |
| END comportamento; |
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