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1. 레지스터(Register)
레지스터는 여러 비트를 저장하는 기억 소자입니다. 일반적으로 D 플립플롭으로 구성되어 있으며, 하나의 플립플롭은 1비트를 구성합니다. 즉, 8개의 플립플롭은 8비트, 16개의 플립플롭은 16비트 레지스터가 됩니다.
레지스터는 주로 CPU 내부에서 연산결과를 중간저장하거나 데이터를 선택할 때 사용합니다.
2. 로드(Load) 신호
로드 신호는 레지스터를 동작시키는 신호입니다. 레지스터에 저장된 데이터를 입력값으로 변경시키는 역할을 합니다.
ClrN 신호는 비동기 카운터로 우선은 무시하시면 됩니다.
로드(Load)는 클럭(Clk)과 AND 게이트로 연결하여 로드가 1일때 클럭 신호에 따라 레지스터 값을 변경할 수 있습니다. 그러나 클럭 신호가 다른 신호와 묶이는 경우 타이밍 문제가 발생할 수 있습니다.
이러한 문제를 해결하기 위해서 다음과 같이 레지스터의 CE(Clock Enable)에 로드를 연결하여 사용합니다.
로드가 0인 경우 클럭 신호와 상관없이 레지스터에 저장된 데이터는 이전 상태를 유지하게 되며, 로드가 1인 경우 클럭 신호에 따라 레지스터의 데이터가 입력값으로 변경됩니다.
3. 쉬프트 레지스터(Shift Register)
쉬프트 레지스터는 플립플롭에 출력과 입력을 연결하는 방법에 따라 데이터를 왼쪽 또는 오른쪽으로 자리이동하는 레지스터 입니다.
쉬프트 레지스터의 종류는 직렬 쉬프트 레지스터와 병렬 쉬프트 레지스터가 있습니다.
1) 직렬 쉬프트 레지스터
직렬 쉬프트 레지스터는 직렬 입력(Serial in, SI)과 직렬 출력(Serial out, SO)을 가지는 레지스터로, 데이터가 한 번에 한 비트씩 쉬프트 됩니다.
Shift 신호는 CE와 연결되며, 신호가 1인 경우 쉬프트 레지스터가 동작하며, 신호가 0인 경우 데이터가 쉬프트 되지 않고 상태를 유지합니다.
예를 들어 초기 레지스터 값이 0101이고 직렬 입력(SI)이 1101인 경우 타이밍도는 다음과 같습니다.
한 번의 클럭 주기마다 데이터가 쉬프트 됨을 확인 할 수 있습니다. 또한 Q0는 직렬 출력(SO)이 되는데, 4번의 클럭 주기동안 SO는 초기 레지스터 값인 0101이 출력됨을 확인할 수 있습니다.
2) 병렬 쉬프트 레지스터
병렬 쉬프트 레지스터는 병렬 입력(Parallel in, PI)과 병렬 출력(Parallel out, PO)을 가지는 레지스터 이며, 다음과 같이 플립플롭과 멀티플렉서(MUX)를 통해 만들 수 있습니다.
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)
직렬 쉬프트 레지스터와 달리 한 클럭에 모든 데이터가 동시에 로드되고 동시에 출력됩니다. 이때 쉬프트 신호와 로드 신호가 멀티플렉서의 제어신호가 됩니다.
쉬프트 신호가 1인 경우 로드 신호에 상관없이 데이터가 쉬프트되며, 쉬프트 신호가 0, 로드 신호가 1이면 레지스터에 데이터가 저장됩니다. 두 신호가 모두 0인 경우에는 레지스터 상태가 유지됩니다.
위에 그림과 같이 Q0는 직렬 출력(SO)이 되므로 병렬 데이터를 직렬 데이터로 변환하기 위해 해당 레지스터를 사용할 수도 있습니다. |