pg 8.


inc




                          1 ----------+-----+
				      |     |
	A0 -----------------------+-------- xor -------------- C0
                                  |   |
				  |   +---- and ----+
				  +---------+       |
				                    |
                                                    |
                                      +-------------+
	 		              |
                           	      +-----+
				      |     |
	A1 -----------------------+-------- xor -------------- C1
                                  |   |
				  |   +---- and ----+
				  +---------+       |
						    |
                                                    |
                                      +-------------+
	 		              |
                           	      +-----+
				      |     |
	A2 -----------------------+-------- xor -------------- C2
                                  |   |
				  |   +---- and ----+
				  +---------+       |
                                                    |
                                                    |
                                      +-------------+
	 		              |
                           	      +-----+
				      |     |
	A3 -----------------------+-------- xor -------------- C3
                                  |   |
				  |   +---- and ----+
				  +---------+       |
                                                    |
                                                    |
                                      +-------------+
	 		              |
                           	      +-----+
				      |     |
	A4 -----------------------+-------- xor -------------- C4
                                  |   |
				  |   +---- and ----+
				  +---------+       |
                                                    |
                                                    |
                                      +-------------+
	 		              |
                           	      +-----+
				      |     |
	A5 -----------------------+-------- xor -------------- C5
                                  |   |
				  |   +---- and ----+
				  +---------+       |
                                                    |
                                                    |
                                      +-------------+
	 		              |
                           	      +-----+
				      |     |
	A6 -----------------------+-------- xor -------------- C6
                                  |   |
				  |   +---- and ----+
				  +---------+       |
                                                    |
                                                    |
                                      +-------------+
	 		              |
                           	      +-----+
				      |     |
	A7 -----------------------+-------- xor -------------- C7
                                  |   |
				  |   +---- and ----+
				  +---------+       |
						    |
						    +-- overflw.









nt used.



                                                      +----------+-----+
                 				                 |     |
	-------------------------------------------------------------- xor ----
                                                                 |   |
				                                 |   +---- and ----
				                                 +---------+
 

		                                                                   +----------+-----+
                 				                                              |     |
	------------------------------------------------------------------------------------------- xor ----
                                                                                              |   |
				                                                              |   +---- and ----
				                                                              +---------+



			                                                                                        +----------+-----+
                 				                                                                           |     |
	------------------------------------------------------------------------------------------------------------------------ xor ----
                                                                                                                           |   |
				                                                                                           |   +---- and ----
				                                                                                           +---------+



			                                                                                                                     +----------+-----+
                 				                                                                                                        |     |
	----------------------------------------------------------------------------------------------------------------------------------------------------- xor ----
                                                                                                                                                        |   |
				                                                                                                                        |   +---- and ----
				                                                                                                                        +---------+



