A CPU has only three instructions I1, I2 and I3, which use the following…

GATE · 2004 · IT

A CPU has only three instructions I1, I2 and I3, which use the following signals in time steps T1-T5:

I1 : T1 : Ain, Bout, Cin

T2 : PCout, Bin

T3 : Zout, Ain

T4 : Bin, Cout

T5 : End

I2 : T1 : Cin, Bout, Din

T2 : Aout, Bin

T3 : Zout, Ain

T4 : Bin, Cout

T5 : End

I3 : T1 : Din, Aout

T2 : Ain, Bout

T3 : Zout, Ain

T4 : Dout, Ain

T5 : End

Which of the following logic functions will generate the hardwired control for the signal Ain ?

  1. A.

    T1.I1 + T2.I3 + T4.I3 + T3

  2. B.

    (T1 + T2 + T3).I3 + T1.I1

  3. C.

    (T1 + T2 ).I1 + (T2 + T4).I3 + T3

  4. D.

    (T1 + T2 ).I2 + (T1 + T3).I1 + T3

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Correct answer: A

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