csadder5b.v
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/**************************************************************************
* *
* Copyright (C) 1994, Silicon Graphics, Inc. *
* *
* These coded instructions, statements, and computer programs contain *
* unpublished proprietary information of Silicon Graphics, Inc., and *
* are protected by Federal copyright law. They may not be disclosed *
* to third parties or copied or duplicated in any form, in whole or *
* in part, without the prior written consent of Silicon Graphics, Inc. *
* *
*************************************************************************/
// $Id: csadder5b.v,v 1.1.1.1 2002/05/17 06:14:57 blythe Exp $
/////////////////////////////////////////////////////////////////////////
//
// Project Reality
//
// module: csadder5b
// description: a 5-bit adder
//
//
// designer: Mike M. Cai 10/5/94
//
/////////////////////////////////////////////////////////////////////////
module csadder5b(sum, a, base_adrs, shf_state);
output [4:0] sum;
input [4:0] a, base_adrs;
input [4:0] shf_state;
wire [4:0] sum0, sum1;
wire [4:0] sum0_co, sum1_co;
wire state_zero;
wire [4:0] sum_m;
wire [4:0] base_adrsbuf;
nr05d2 state0(.zn(state_zero), .a1(shf_state[0]), .a2(shf_state[1]),
.a3(shf_state[2]), .a4(shf_state[3]), .a5(shf_state[4]));
/*
ad01d1 sum0b2(.s(sum0[2]), .co(sum0_co[3]),
.a(a[2]), .b(base_adrs[2]), .ci(1'h0));
ad01d1 sum1b2(.s(sum1[2]), .co(sum1_co[3]),
.a(a[2]), .b(base_adrs[2]), .ci(1'h1));
ad01d1 sum0b3(.s(sum0[3]), .co(sum0_co[4]),
.a(a[3]), .b(base_adrs[3]), .ci(sum0_co[3]));
ad01d1 sum1b3(.s(sum1[3]), .co(sum1_co[4]),
.a(a[3]), .b(base_adrs[3]), .ci(sum1_co[3]));
ad01d1 sum0b4(.s(sum0[4]), // .co(sum0_co[5]),
.a(a[4]), .b(base_adrs[4]), .ci(sum0_co[4]));
ad01d1 sum1b4(.s(sum1[4]), // .co(sum1_co[5]),
.a(a[4]), .b(base_adrs[4]), .ci(sum1_co[4]));
mx21d1 sum2(.z(sum_m[2]), .i0(sum0[2]), .i1(sum1[2]), .s(sum0_co[2]));
mx21d1 sum3(.z(sum_m[3]), .i0(sum0[3]), .i1(sum1[3]), .s(sum0_co[2]));
mx21d1 sum4(.z(sum_m[4]), .i0(sum0[4]), .i1(sum1[4]), .s(sum0_co[2]));
ad01d1h sumb0(.s(sum_m[0]), .co(sum0_co[1]),
.a(a[0]), .b(base_adrs[0]), .ci(1'h0));
*/
ni01d2 base0(.z(base_adrsbuf[0]), .i(base_adrs[0]));
ni01d2 base1(.z(base_adrsbuf[1]), .i(base_adrs[1]));
ni01d2 base2(.z(base_adrsbuf[2]), .i(base_adrs[2]));
ni01d2 base3(.z(base_adrsbuf[3]), .i(base_adrs[3]));
ni01d2 base4(.z(base_adrsbuf[4]), .i(base_adrs[4]));
an02d1h sumb0_co(.z(sum0_co[1]), .a1(a[0]), .a2(base_adrsbuf[0]));
xo02d1 sumb0_sum(.z(sum_m[0]), .a1(a[0]), .a2(base_adrsbuf[0]));
ad01d1h sumb1(.s(sum_m[1]), .co(sum0_co[2]),
.a(a[1]), .b(base_adrsbuf[1]), .ci(sum0_co[1]));
ad01d1h sumb2(.s(sum_m[2]), .co(sum0_co[3]),
.a(a[2]), .b(base_adrsbuf[2]), .ci(sum0_co[2]));
ad01d1h sumb3(.s(sum_m[3]), .co(sum0_co[4]),
.a(a[3]), .b(base_adrsbuf[3]), .ci(sum0_co[3]));
ad01d1h sumb4(.s(sum_m[4]), // .co(sum0_co[1]),
.a(a[4]), .b(base_adrsbuf[4]), .ci(sum0_co[4]));
mx21d1h muxbout0(.z(sum[0]), .i0(sum_m[0]), .i1(base_adrsbuf[0]), .s(state_zero));
mx21d1h muxbout1(.z(sum[1]), .i0(sum_m[1]), .i1(base_adrsbuf[1]), .s(state_zero));
mx21d1h muxbout2(.z(sum[2]), .i0(sum_m[2]), .i1(base_adrsbuf[2]), .s(state_zero));
mx21d1h muxbout3(.z(sum[3]), .i0(sum_m[3]), .i1(base_adrsbuf[3]), .s(state_zero));
mx21d1h muxbout4(.z(sum[4]), .i0(sum_m[4]), .i1(base_adrsbuf[4]), .s(state_zero));
//initial
// $monitor($time, "sum = %b %h", sum, sum);
endmodule // csadder5b