l6_register.pdf - 1 E1122 DIGITAL LOGIC(B SPRING 2018...

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E1122 DIGITAL LOGIC (B) SPRING 2018 Lecture 6 Register 1
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2 Contents Register Introduction Simple register Register with parallel load Shift Register Shift Register Serial In/Serial Out Shift Register Serial In/Parallel Out Shift Register Parallel In/Serial Out Shift Register Parallel In/ Parallel Out Two way shift register
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Definitions A synchronous circuit is a sequential circuit whose input/output changes are synchronized by a reference signal called clock signal. Basic synchronous circuits include: Counters (sequential circuits configure in a specific form in order to count clock ticks). Registers (for elementary storage and shift operations) Random-Access Memories (RAMs) for Read/write operations.
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Basic Synchronous Circuits Characteristics: Clocked by stable clock signal (crystal oscillator) Set of input and output data lines Set of control signals Can be described using FSMs Can be implemented using basic synchronous cells (DFFs and JKFFs). Exist as MSI (medium scale integrated) circuits. Their designs often require the use of some combinational elements.
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5 Registers Group of storage elements read/written as a unit Store related values (e.g. a binary word) An n-bit register is made of n flip-flips and can store n bits
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