FF - Universidade Estadual do Cear UECE Cincias da Computao...

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Universidade Estadual do Ceará – UECE Ciências da Computação Circuitos Lógicos e Digitais – 2008/2 Flip-Flops Domingos Sávio Março de 2009
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Flip-Flops Os Latches implementam os elementos de memória para os circuitos sequênciais assíncronos, enquanto os Flip-flops implementam para os circuitos sequênciais síncronos A principal diferença entre eles é a forma como mudam de estado Os latches são transparentes,isto é, uma mudança nas entradas alteram imediatamente as saídas Os FF não são transparentes Com os FF é possível ler e escrever ao mesmo tempo
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Sinal de Relógio Determina os momentos exatos em que os circuitos devem mudar de estados Um sinal de clock é um trêm de pulsos de onda quadrado Sinal ideal Trem de pulso tempo Vcc tensão
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Latch SR Controlado por Relógio Ainda possui o comportamento transparente quando o clk é 1 R S Q Q CK Símbolo Circuito
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Flip-Flops acionados por bordas
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