PLE12P8                                       PLE DESIGN SPECIFICATION
P5016                                            VINCENT COLI 02/10/83
PARTIAL PRODUCTS ADDER
MMI SANTA CLARA, CALIFORNIA
.ADD A0 A1 A2 B0 B1 B2 C0 C1 C2 D0 D1 D2
.DAT P0 P1 P2 P3 P4


P4,P3,P2,P1,P0 = A2,A1,A0 .+. B2,B1,B0 .+. C2,C1,C0 .+. D2,D1,D0


FUNCTION TABLE

A2 A1 A0 B2 B1 B0 C2 C1 C0 D2 D1 D0 P4 P3 P2 P1 P0

;AAA   BBB   CCC   DDD   PPPPP     COMMENTS
;210   210   210   210   43210     A + B + C + D =  P
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 LLL   LLL   LLL   LLL   LLLLL     0 + 0 + 0 + 0 =  0
 LLH   LLH   LLH   LLH   LLHLL     1 + 1 + 1 + 1 =  4
 LHL   LHL   LHL   LHL   LHLLL     2 + 2 + 2 + 2 =  8
 LHH   LHH   LHH   LHH   LHHLL     3 + 3 + 3 + 3 = 12
 HLL   HLL   HLL   HLL   HLLLL     4 + 4 + 4 + 4 = 16
 HHH   HHH   HHH   HHH   HHHLL     7 + 7 + 7 + 7 = 28
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DESCRIPTION

THIS PLE12P8 PERFORMS THE PARTIAL PRODUCTS REDUCTION FOR A
WALLACE TREE ADDER.  FOUR ROWS OF 3-BIT NUMBERS (A2-A0, B2-B0,
C2-C0, AND D2-D0) ARE ADDED TOGETHER TO PRODUCE A 5-BIT SUM (P4-P0).


                  A2 A1 A0
                  B2 B1 B0
                  C2 C1 C0
              +   D2 D1 D0
            ---------------
            P4 P3 P2 P1 P0