Flipper
=======

Inputs:   DATA_IN  (8)
          ADDR     (3)

Outputs:  DATA_OUT (8)

Functional description:
  Copies DATA_IN to DATA_OUT, except the bit referred to by ADDR is 
complemented.

Timing:
  This block is combinational with a depth of 3.

Subcells:
  nah - this is pretty easy

Leaf cells:
  8 3-input NAND gates           8 @ 6T each = 48T
  8 2-input XNOR gates		 8 @ 8T each = 64T
  3 inverters for ADDR           3 @ 2T each =  6T
                                              ----
                                              118T

Possible deficiencies of this design:
  seems reasonable