Mon, 19 Sep 2011, 22:03

There was a disconnect in the solution sheet to Problem set 2.  It will get
fixed momentarily.  Meanwhile, the correct solution is as follows, compliments
of one of your classmates who noticed the error.

The correct solution to 6A is shown below:

A) Implement a 4-to-1 mux using only 2-to-1 muxes making sure to properly
connect all of the terminals. Remember that you will have 4 inputs (A, B, C,
and D), 2 control signals (S1 and S0), and 1 output (OUT). After
implementing the 4-1 mux, fill in the truth table below.

   A      B		        C      D
 __|______|__	              __|______|__
 \ 0      1  /	              \ 0      1  /
  \_________/<----- S0         \_________/<- S0
       |_____________      _________|
                  ___|_____|__
                  \  0     1 /
                   \________/<- S1
                       |
                       F

* You require 3 muxes. First, the input are A and B and the select line is
S0. Second, inputs are C and D and the select line is also S0. Third, is a
mux where both its inputs are the outputs of the first two muxes and select
line is S1.
* * Every time S1 and S0 are both 0, OUT is the same as A.
Every time S1 and S0 are 0 and 1 respectively, OUT is the same as B.
Every time S1 and S0 are 1 and 0 respectively, OUT is the same as C.
Every time S1 and S0 are 1 and 1 respectively, OUT is the same as D. *"

I apologize for any undue anxiety if you already looked at the incorrect 
solution sheet.

See you on Wednesday.

Yale Patt