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Status register
Status register
Status register
Status register
Status register
Status register
Status register
Status register
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Status register

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Transcript

  • 1. Status register and Shift register Design
  • 2. Status register
    Relative magnitude of two numbers may be determined by subtracting one from the other.
    Also called as flag bits or condition code bits
    Status Bits
    C – Carry
    S – Sign bit
    Z – zero bit
    V – Overflow bit
  • 3. Status register
  • 4. Status register
    C – Carry bit
    Set if the output carry of ALU is 1
    S – Sign bit
    Set if the highest order bit is 1
    Z – Zero bit
    Set if the ALU’s output contains all zeros
    V - Overflow bit
    Set if there is any overflow. For a 8bit ALU, V is set if the result is greater than 127 and less than -128
  • 5. (A-B) of unsigned numbers
    A and B are unsigned numbers
  • 6. SHIFTER
  • 7. Shifter

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