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ISSN 0249-6399 ISRN INRIA/RR--4494--FR+ENG
apport de rechercheSmallMultiplier-basedMultiplicationand
DivisionOperatorsforVirtex-IIDevices
Jean-LucBeuchat,ArnaudTisserand
No4494
July2002
TH`EME2
Unit´ederechercheINRIARhˆone-Alpes
LUT LUT 11 0 01 LUT 0 LUT101LUT
LUT10 1 0 LUT 0 LUT 10 FF FF FF FF FF FF FF FF FF FFMULT18x18
MULT18x18S
pipeline stage(c) Embedded multiplier with an internal FF FF FF FF FF FFSlice 0Slice 1
Slice 2Slice 3
CLBFirst carry chain
Second carry chain
(a) Virtex-II CLB(b) Embedded multiplier netnet netTmultckTioockTmultTiockiq TioockCritical path
Critical path
library virtex2; use virtex2.components.all mult: MULT18x18S port map (P => XY,
A => X,
B => Y,
C => Clk,
CE => Ce,
R => Clr);. . .
m X0X=X0+2nX1=n1X
i=0x i2i+2nmn1X i=0x n+i2i; XY X0 ?????Y0 X ?????Y X0 ?X1 ?Y0 ???????Y1 X0 Y0 X1 Y1 X0 Y1 X1Y0concatenation5:03:0
7:4X0 * Y0
X1 * Y0 * k
X0 * Y1 * k
X1 * Y1 * k * k
X1X0 Y1Y0Optional pipeline leveln bits
?(X1+X0)(Y1+Y0) ???????X0Y0 (X1+X0) ?????(Y1+Y0) ???X1X0 X0 X1 Y1Y0 X0 Y0 X1Y113:43:0
X0X1Y1Y0
X0 * Y0
X1 * Y1 * k * k-X1 * Y1 * kSign extension
(X0+X1) * (Y0+Y1) * k -X0 * Y0 * k m X ?????Y X1Y0 xiyj m17 i i (2mi1) i=m1iX j=0x iyj2i+j+m1X j=i+1x jym1i2j+mi1: max( i)=m1iX j=02 i+j+m1X j=i+12 j+mi1 m1iX j=02 i+j+2m2i2X j=mi2 i+j=2i22m2i11: max( i+ i+1)=22mi1+22mi22i+12i =101111|{z}2m2i40100|{z}
i i+ i+1 ?????(2mi) 0+ 1)+( 2+ 3) max( 0+1)|{z}
422+
3)|{z}
40=101111| {z}
3801+101111|{z}
340100:
i m ?????n n = 17 X0 Y0 X1 Y1 n = 17 PP3PP2PP0PP1
0 00000 00 00 0 0000 0PP0PP1PP2PP3
n = 17 n = 17 (a) Proposed multiplierm bitsMULT18x18
m-n partial products PP0 PP1 PP2 PP3 (c) Adding the partial products(b) Adding the partial products (tree structure) m=18 ?????m=19 m m=23 50182
=8 n n=17 n n n=m=2 n=17 n 0 50
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450
500
550
1820222426283032
slicenumber operandsize33333333rrrrrrrreeeeeeee
13 14 15 16 17 18 19 20 2122
1820222426283032
[ns] operandsize rrr rrrrr eeeeeeee33333333
3 ??X0 ?????Y0 20 2530
35
40
45
50
55
182022242628303234
slicenumber operandsize333333333
rrrrrrrrr 10 11 12 13 14 15 16 17 18 19182022242628303234
[ns] operandsize333333333
rrrrrrrrr eeeeeeeee ?n=17 ?n=m=2 ?n=17 n<<17 r t=dn=ke x=d qj x rwj ?????d ?nr ?????nd qj+1 qj+1d wjwj+1 q j+1rwj d shiftQsel table
r=2k k qj+1d 2k nr ?????nd f;+1;:::;0;:::;1;g k f2;1;0;1;2g ?=2 f3;2;1;0;1;2;3g ?=3 nr+nd qj+1d wj wj nr;nd 270050
100
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16243240
123area [slice number]
MULT18x18 block number
operand size std r2 r4/2 r4/3 r8/5 r8/6 #MULT 200250
300
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450
500
550
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700
16243240
121416182022242628
division time [ns] iteration delay [ns] operand size std r2 r4/2 r4/3 r8/5 r8/6 n qj+1d qj+1d´Editeur
http://www.inria.frISSN0249-6399
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