PLE12P8                                       PLE DESIGN SPECIFICATION
P5017                                            VINCENT COLI 08/10/83
PARTIAL PRODUCTS ADDER
MMI SANTA CLARA, CALIFORNIA
.ADD A0 A1 A2 A3 B0 B1 B2 B3 C0 C1 C2 C3
.DAT P0 P1 P2 P3 P4 P5


P5,P4,P3,P2,P1,P0 = A3,A2,A1,A0 .+. B3,B2,B1,B0 .+. C3,C2,C1,C0


FUNCTION TABLE

A3 A2 A1 A0 B3 B2 B1 B0 C3 C2 C1 C0 P5 P4 P3 P2 P1 P0

;AAAA   BBBB   CCCC   PPPPPP     COMMENTS
;3210   3210   3210   543210     A  +  B  +  C  =  P
------------------------------------------------------
 LLLL   LLLL   LLLL   LLLLLL     0  +  0  +  0  =  0
 LLLH   LLLH   LLLH   LLLLHH     1  +  1  +  1  =  3
 LLHL   LLHL   LLHL   LLLHHL     2  +  2  +  2  =  6
 LHLL   LHLL   LHLL   LLHHLL     4  +  4  +  4  = 12
 HLLL   HLLL   HLLL   LHHLLL     8  +  8  +  8  = 24
 HHHH   HHHH   HHHH   HLHHLH    15  + 15  + 15  = 45
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DESCRIPTION

THIS PLE12P8 PERFORMS THE PARTIAL PRODUCTS REDUCTION FOR A
WALLACE TREE ADDER.  THREE ROWS OF 4-BIT NUMBERS (A3-A0, B3-B0,
AND C3-C0) ARE ADDED TOGETHER TO PRODUCE A 6-BIT SUM.


                  A3 A2 A1 A0
                  B3 B2 B1 B0
              +   C3 C2 C1 C0
            ------------------
            P5 P4 P3 P2 P1 P0