PLE8P4                                        PLE DESIGN SPECIFICATION
P5015                                            VINCENT COLI 04/06/83
PARTIAL PRODUCTS ADDER
MMI SANTA CLARA, CALIFORNIA
.ADD A  B  C  D  E  F  G
.DAT P0 P1 P2


P2,P1,P0 = A .+. B .+. C .+. D .+. E .+. F .+. G  ; P = A+B+C+D+E+F+G


FUNCTION TABLE

A B C D E F G P2 P1 P0

;                             PPP     COMMENTS
;A   B   C   D   E   F   G    210     A + B + C + D + E + F + G = P
--------------------------------------------------------------------
 L   L   L   L   L   L   L    LLL     0 + 0 + 0 + 0 + 0 + 0 + 0 = 0
 L   H   L   H   L   H   L    LHH     0 + 1 + 0 + 1 + 0 + 1 + 0 = 3
 H   L   H   L   H   L   H    HLL     1 + 0 + 1 + 0 + 1 + 0 + 1 = 4
 H   H   H   H   H   H   H    HHH     1 + 1 + 1 + 1 + 1 + 1 + 1 = 7
--------------------------------------------------------------------


DESCRIPTION

THIS PLE8P4 PERFORMS THE PARTIAL PRODUCTS REDUCTION FOR A WALLACE
TREE ADDER.  SEVEN ROWS OF 1-BIT NUMBERS (A, B, C, D, E, F, AND G)
ARE ADDED TOGETHER TO PRODUCE A 3-BIT SUM.


                      A
                      B
                      C
                      D
                      E
                      F
                +     G
               ---------
               P2 P1 P0