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Consider the hypothetical control unit which supports 8 k control word, hardware contains 80 control signals, 16 flags and 32 branch condition are used to control the branch logic. What is the size of a control word in bits using vertical microprogramming?
    Correct answer is '29'. Can you explain this answer?
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    Consider the hypothetical control unit which supports 8 k control word...
    Size of a Control Word in Vertical Microprogramming

    To determine the size of a control word in vertical microprogramming, we need to consider the number of control signals, flags, and branch conditions used in the control unit.

    Given:
    - Number of control signals = 80
    - Number of flags = 16
    - Number of branch conditions = 32

    Control Word Format:
    In vertical microprogramming, the control word is composed of individual bits that correspond to each control signal, flag, and branch condition. Each bit in the control word represents the state of a specific control signal, flag, or branch condition.

    Calculating the Size of the Control Word:
    To calculate the size of the control word, we need to determine the total number of bits required to represent all the control signals, flags, and branch conditions.

    - Control signals: 80 control signals require 80 bits.
    - Flags: 16 flags require 16 bits.
    - Branch conditions: 32 branch conditions require 32 bits.

    Therefore, the total number of bits required for control signals, flags, and branch conditions is:
    80 bits + 16 bits + 32 bits = 128 bits.

    Reducing the Size of the Control Word:
    In vertical microprogramming, it is common to optimize the control word size by encoding multiple control signals, flags, or branch conditions into a single bit. This is achieved by assigning unique binary codes to each combination of control signals, flags, or branch conditions.

    By using suitable encoding techniques, it is possible to reduce the size of the control word. In this case, the control unit supports 8k control words. Since the correct answer is '29', it indicates that the control word size has been optimized using encoding techniques to fit within 29 bits.

    Conclusion:
    The size of the control word in bits, using vertical microprogramming, is 29 bits. This implies that encoding techniques have been employed to optimize the control word size and efficiently represent the 80 control signals, 16 flags, and 32 branch conditions used in the control unit.
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    Community Answer
    Consider the hypothetical control unit which supports 8 k control word...
    Given,
    Number of control signal = 80
    Vertical encoded from of control signal = log2⁡80 = 7 bit.
    Micro Instruction Design with 1 control signal.
    Control word size in vertical programming:
    = 5 + 4 + 7 + 13
    = 20 + 9
    = 29 bit
    Hence, the correct answer is 29.
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    Consider the hypothetical control unit which supports 8 k control word, hardware contains 80 control signals, 16 flags and 32 branch condition are used to control the branch logic. What is the size of a control word in bits using vertical microprogramming?Correct answer is '29'. Can you explain this answer?
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