Sesion_03.ppt - Sesin 3 Circuitos Digitales Aviso El...

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Sesión 3 Circuitos Digitales
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Aviso El Laboratorio de circuitos digitales I, comienza la próxima semana:19 de Mayo de 2008. Tema: Tutorial de construcción de esquemáticos en el programa Xilinx, e implementación en la tarjeta de desarrollo.
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Multiplicación Binaria X 0 1 0 0 0 1 0 1
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División Binaria / 0 1 0 e 0 1 e 1
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Códigos Binario BCD BCD Exceso 3 BCD AIKEN GRAY ASCII
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Código decimal binario (BCD) El BCD (Binary Code Decimal ) expresa los diferentes dígitos decimales con un código binario. El código BCD ( 8421) indica los diferentes pesos de los cuatro bits binarios ( 2 3 , 2 2 , 2 1 , 2 0 ). Convertir a BCD los números decimales 24 y 6498 . 24 10 =0010 0100 6498 10 =0110 0100 1001 1000 BCD DEC Dígito en BCD 0 0000 1 0001 2 0010 3 0011 4 0100 5 0101 6 0110 7 0111 8 1000 9 1001
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BCD Exceso 3 DEC Dígito en BCD 0 0011 1 0100 2 0101 3 0110 4 0111 5 1000 6 1001 7 1010 8 1011 9 1100
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BCD AIKEN (2 4 2 1) DEC Dígito en BCD 0 0000 1 0001 2 0010 3 0011 4 0100 5 1011 6 1100 7 1101 8 1110 9 1111
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CODIGO GRAY DEC Dígito en BCD 0 0000 1 0001 2 0011 3 0010 4 0110 5 0111 6 0101 7 0100 8 1100 9 1101 Solo hay cambio de un bit en el siguiente número
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Variables lógicas En los sistemas digitales se manejan dígitos binarios, es decir 0’s (ceros) y 1’s (unos). Por ejemplo una variable lógica, solo puede tomar dos y solo dos valores de combinación: Por lo tanto dos variables lógicas A y B tomaran 4 posibles combinaciones A 0 1 A 0 0 1 1 B 0 1 0 1
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FUNCIONES LÓGICAS Todo circuito lógico por simple que sea tiene líneas de entrada y de salida La variable lógica puede tomar uno de dos valores posibles:
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FUNCIONES LÓGICAS Los dos valores posibles deben ser tales que sean mutuamente excluyentes.
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