• Giáo trình Auto CAD - Phần 2 - Trường Cao đẳng kỹ thuật công nghệ TP HCMGiáo trình Auto CAD - Phần 2 - Trường Cao đẳng kỹ thuật công nghệ TP HCM

    Lệnh Wblock (Write block to file) sử dụng để l-u một block hoặc một số đối t-ợng của bản vẽ hiện hành thành một file bản vẽ mới. Block đ-ợc l-u thành file phải nằm trong bản vẽ hiện hành. File bản vẽ sau khi đu7ợc tạo bằng lệnh Wblock có thể chèn vào file bản vẽ khác. Nếu ta muốn chèn một block hoặc một số đối t-ợng của file bản vẽ hiện hành (ví...

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  • Digital Logic Design - Lecture 32: Datapath AnalysisDigital Logic Design - Lecture 32: Datapath Analysis

    Main computation unit in most computer systems ALUs perform a variety of different functions Add, subtract, OR, AND Example: ALU chip (74LS382) Has data and control inputs Individual chips can be chained together to make larger ALUs ALUs are important parts of datapaths ROMs often are used in the control path Build a data and control path

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  • Digital Logic Design - Lecture 31: PLAs and Arithmetic Logic Unit (ALU)Digital Logic Design - Lecture 31: PLAs and Arithmetic Logic Unit (ALU)

    1 Select the Wire Tool from the Toolbar. 2 Place the cursor on the emitter pin of the transistor (the pin with the arrow.) When the cursor gets close to the pin, a small rectangle appears. 3 Click and hold the left mouse button, then drag the wire to the pin of the Ground symbol. 4 Release the mouse button to make the connection. 5 Place the cu...

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  • Digital Logic Design - Lecture 30: Read Only Memory (ROM)Digital Logic Design - Lecture 30: Read Only Memory (ROM)

    ROMs provide stable storage for data ROMs have address inputs and data outputs ROMs directly implement truth tables ROMs can be used effectively in Mealy and Moore machines to implement combinational logic In normal use ROMs are read-only They are only read, not written ROMs are often used by computers to store critical information Unlike SR...

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  • Digital Logic Design - Lecture 29: Random Access Memory (RAM)Digital Logic Design - Lecture 29: Random Access Memory (RAM)

    Memories provide storage for computers Memories are organized in words Selected by addresses SRAMs store data in latches Accessed by surrounding circuitry RAM waveforms indicate the control signals needed for access Words in SRAMs are accessed with decoders Only one word selected at a time Error correction and detection codes (Hamming)

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  • Digital Logic Design - Lecture 28: Timing AnalysisDigital Logic Design - Lecture 28: Timing Analysis

    Maximum clock frequency is a fundamental parameter in sequential computer systems Possible to determined clock frequency from propagation delays and setup time The longest path determines the clock frequenct All flip-flop to flip-flop paths must be checked Hold time are satisfied by examining contamination delays The shortest contamination del...

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  • Digital Logic Design - Lecture 27: CountersDigital Logic Design - Lecture 27: Counters

    Binary counters can be ripple or synchronous Ripple counters use flip flop outputs as flop triggers Some delay before all flops settle on a final value Do no require a clock signal Synchronous counters are controlled by a clock All flip flops change at the same time Up/Down counters can either increment or decrement a stored binary value Con...

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  • Digital Logic Design - Lecture 26: Finite State Machine Design ProcedureDigital Logic Design - Lecture 26: Finite State Machine Design Procedure

    Deliver package of gum after 15 cents deposited Single coin slot for dimes, nickels No change Design the FSM using combinational logic and flip flops

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  • Digital Logic Design - Lecture 25: Shift RegistersDigital Logic Design - Lecture 25: Shift Registers

    Shift registers can be combined together to allow for data transfer Serial transfer used in modems and computer peripherals (e.g. mouse) D flip flops allow for a simple design Data clocked in during clock transition (rising or falling edge) Serial addition takes less chip area but is slow Universal shift register allows for many operations Th...

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  • Digital Logic Design - Lecture 23: More Sequential Circuit Analysis and DesignDigital Logic Design - Lecture 23: More Sequential Circuit Analysis and Design

    Sequential circuit consists of A combinational circuit that produces output A feedback circuit We use JK flip-flops for the feedback circuit Simple counter examples using JK flip-flops Provides alternative counter designs We know the output Need to know the input combination that produces this output Use an excitation table Built from th...

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