vi_lerp_csa.v
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////////////////////////////////////////////////////////////////////////
//
// Project Reality
//
// module: vi_lerp_csa
// description: Carry save adder tree for lerp for video interface.
// 10 partial products.
//
// designer: Phil Gossett
// date: 10/23/94
//
////////////////////////////////////////////////////////////////////////
// $Id: vi_lerp_csa.v,v 1.1.1.1 2002/05/17 06:14:58 blythe Exp $
module vi_lerp_csa (a, p0p, p1p, p2p, p3p, p4p, p5p, p6p, p7p, c, mp);
input [4:0] a;
input [5:0] p0p;
input [5:0] p1p;
input [5:0] p2p;
input [5:0] p3p;
input [5:0] p4p;
input [5:0] p5p;
input [5:0] p6p;
input [5:0] p7p;
input [7:0] c;
output [7:0] mp;
wire [5:0] sa; // intermediate carry save adder sums and carrys
wire [5:0] ca;
wire [7:0] sb;
wire [5:0] cb;
wire [6:0] sc;
wire [7:0] cc;
wire [7:0] sd;
wire [5:0] cd;
wire [7:0] se;
wire [6:0] ce;
wire [8:0] sf;
wire [7:0] cf;
wire [10:0] sg;
wire [7:0] cg;
wire [9:0] sh;
wire [9:0] ch;
wire [9:0] si;
assign sa[5] = p1p[5];
vi_lerp_csa_ha1 sag (.a(p0p[5]),
.b(p1p[4]),
.s(sa[4]), .co(ca[5]));
vi_lerp_csa_fa4 saf (.a(a[4:1]),
.b(p0p[4:1]),
.ci(p1p[3:0]),
.s(sa[3:0]), .co(ca[4:1]));
vi_lerp_csa_haco sah (.a(a[0]),
.b(p0p[0]), .co(ca[0]));
assign sb[7] = p3p[5];
vi_lerp_csa_ha1 sbg (.a(p3p[4]),
.b(p2p[5]),
.s(sb[6]), .co(cb[5]));
vi_lerp_csa_fa4 sbf (.a(p3p[3:0]),
.b(p2p[4:1]),
.ci(ca[5:2]),
.s(sb[5:2]), .co(cb[4:1]));
vi_lerp_csa_ha1 sbh (.a(p2p[0]),
.b(ca[1]),
.s(sb[1]), .co(cb[0]));
assign sb[0] = ca[0];
vi_lerp_csa_ha2 scg (.a(cb[5:4]),
.b(sb[7:6]),
.s(sc[6:5]), .co(cc[7:6]));
vi_lerp_csa_fa4 scf (.a(sa[5:2]),
.b(cb[3:0]),
.ci(sb[5:2]),
.s(sc[4:1]), .co(cc[5:2]));
vi_lerp_csa_ha1 sch (.a(sa[1]),
.b(sb[1]),
.s(sc[0]), .co(cc[1]));
vi_lerp_csa_haco sce (.a(sa[0]),
.b(sb[0]), .co(cc[0]));
assign sd[7] = p6p[5];
vi_lerp_csa_ha1 sdg (.a(p5p[5]),
.b(p6p[4]),
.s(sd[6]), .co(cd[5]));
vi_lerp_csa_fa5 sdf (.a(p4p[5:1]),
.b(p5p[4:0]),
.ci({p6p[3:0],1'b1}),
.s(sd[5:1]), .co(cd[4:0]));
assign sd[0] = p4p[0];
vi_lerp_csa_haso seg (.a(c[7]),
.b(p7p[5]),
.s(se[7]));
vi_lerp_csa_fa6 sef (.a(c[6:1]),
.b({p7p[4:0],1'b1}),
.ci(cd[5:0]),
.s(se[6:1]), .co(ce[6:1]));
assign se[0] = ~c[0];
assign ce[0] = c[0];
vi_lerp_csa_haso sfg (.a(ce[6]),
.b(se[7]),
.s(sf[8]));
vi_lerp_csa_fa6 sff (.a(sd[7:2]),
.b(ce[5:0]),
.ci(se[6:1]),
.s(sf[7:2]), .co(cf[7:2]));
vi_lerp_csa_ha2 sfh (.a(sd[1:0]),
.b({se[0],1'b1}),
.s(sf[1:0]), .co(cf[1:0]));
vi_lerp_csa_haso sgi (.a(cf[7]),
.b(sf[8]),
.s(sg[10]));
vi_lerp_csa_ha2 sgg (.a(cf[6:5]),
.b(sf[7:6]),
.s(sg[9:8]), .co(cg[7:6]));
vi_lerp_csa_fa5 sgf (.a(cc[7:3]),
.b(cf[4:0]),
.ci(sf[5:1]),
.s(sg[7:3]), .co(cg[5:1]));
vi_lerp_csa_ha1 sgh (.a(cc[2]),
.b(sf[0]),
.s(sg[2]), .co(cg[0]));
assign sg[1:0] = cc[1:0];
vi_lerp_csa_haso shi (.a(cg[7]),
.b(sg[10]),
.s(sh[9]));
vi_lerp_csa_ha3 shg (.a(cg[6:4]),
.b(sg[9:7]),
.s(sh[8:6]), .co(ch[9:7]));
vi_lerp_csa_fa4 shf (.a(sc[6:3]),
.b(cg[3:0]),
.ci(sg[6:3]),
.s(sh[5:2]), .co(ch[6:3]));
vi_lerp_csa_ha2 shh (.a(sc[2:1]),
.b(sg[2:1]),
.s(sh[1:0]), .co(ch[2:1]));
vi_lerp_csa_haco she (.a(sc[0]),
.b(sg[0]), .co(ch[0]));
vi_lerp_csa_add10 mpa (.b(sh[9:0]), // final carry-propagating adder
.a(ch[9:0]),
.s(si[9:0]));
assign mp = si[9:2];
endmodule // vi_lerp_csa