3. Indicate the dots required to be connected (1 to 8) to implement a NOR function using the PLD AND array shown below:

  1. Dots at 3, 8
  2. Dots at 2, 4, 7, 8
  3. Dots at 2, 4 (only)
  4. Dots at 5, 7, 1, 2
  5. Dots at 5, 7 (only)

5 is WRONG. Placing dots at 5 and 7 provides I1'I2' = (I1 + I2)' as one input to the OR gate. However, since no connections are specified for the second AND gate, the corresponding OR gate output is indeterminant (unspecified). Avoid this situation.

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