Re: HW #2

Arun Somani (arun@shasta.ee.washington.edu)
Fri, 17 Jan 1997 09:24:53 -0800

>
> I just had a couple of questions:
>
> On problem 5 I used the circuit that was described on Slide 11 of the
> Introduction where Z = (A and (not B)) or (B and (not A)). Is this the
> correct staircase light circuit?

I generally do not like to confirm if an answer is correct. I can clarify
problem without giving you the answer. In this case, I will make an exception
since we did it in the class. Yes, that represents the required logic.

>
> On problem 6 I am somewhat confused as to which of the following are the
> 1. 'Boolean expression in canonical ___term form',
> 2. 'Canonical ___term form'
> 3. 'little M/m notation'
> 4. 'canonical ___term expression'
>
> Ex.
> 5. SIGMAm(0,3) (or) PI M(1,2)
> 6. m(0)+m(3) (or) M(1)M(2)
> 7. ABC+... ABC+...
>
> I assumed that 1 = 2 = 4 = 7 and 3 = 5 = 6.

I did not get much time in Wednesday class to explain
the difference again as we ran out of time. But canonical
form has one term for each 1 (in SOP form) or 0 (POS form)
in the truth table.

And you are right in your interpretation
except that column 1 of (7) should be A'B'C' for m(0) and
column 2 of (7) should be (A + B + C') for M(1).

>
> Am I all screwed up?

No, just opposite. You are absolutely fine.