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GATE | GATE-IT-2004 | Question 49

  • Last Updated : 19 Nov, 2018

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 ?
(A) T1.I1 + T2.I3 + T4.I3 + T3
(B) (T1 + T2 + T3).I3 + T1.I1
(C) (T1 + T2 ).I1 + (T2 + T4).I3 + T3
(D) (T1 + T2 ).I2 + (T1 + T3).I1 + T3

Answer: (A)


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