ALU (arithmetic logic unit) design in schematic & in ver

[mrthn]

i'm sorry the pictures arent seen.maybe you want to see pictures.you can visit: **broken link removed**

These codes are included everything what you need in ALU as a beginner. I compiled the codes in ISE Xilinx and I embedded the codes Spartan 3 FPGA. Everything is OK. I will give the schematic images. If you want , you can send a pm and I can give you the compiled program. Zero, overflow, less are also included.

This figure shows 32 bit ALU with 5 functions, most significant bit and 32 bit completed ALU without Zero output.


This figure shows zero output with 5 functions.



This figure shows 32 bit ALU with 6 functions with less and zero.

Verilog codes

Carry look ahead:


module carrybit(
input [30:0] ag,
input [30:0] bg,
input ai,
input bi,
input c0,
output [31:1] c
);

wire [30:0] a,b,g,p;
assign a=(ai)?~ag:ag;
assign b=(bi)?~bg:bg;
assign g[30:0]=a[30:0] & b[30:0];
assign p[30:0]=a[30:0] ^ b[30:0];
assign c[1]=g[0] | (p[0] & c0);
assign c[2]=g[1] | (p[1] & (g[0] | (p[0] & c0)));
assign c[3]=g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))));
assign c[4]=g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))));
assign c[5]=g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))));
assign c[6]=g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))));
assign c[7]=g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))));
assign c[8]=g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))));
assign c[9]=g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))));
assign c[10]=g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))));
assign c[11]=g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))));
assign c[12]=g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))));
assign c[13]=g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))));
assign c[14]=g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))));
assign c[15]=g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))));
assign c[16]=g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))));
assign c[17]=g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))));
assign c[18]=g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))));
assign c[19]=g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))));
assign c[20]=g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))));
assign c[21]=g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))))));
assign c[22]=g[21] | (p[21] & (g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))))))));
assign c[23]=g[22] | (p[22] & (g[21] | (p[21] & (g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))))))))));
assign c[24]=g[23] | (p[23] & (g[22] | (p[22] & (g[21] | (p[21] & (g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))))))))))));
assign c[25]=g[24] | (p[24] & (g[23] | (p[23] & (g[22] | (p[22] & (g[21] | (p[21] & (g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))))))))))))));
assign c[26]=g[25] | (p[25] & (g[24] | (p[24] & (g[23] | (p[23] & (g[22] | (p[22] & (g[21] | (p[21] & (g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))))))))))))))));
assign c[27]=g[26] | (p[26] & (g[25] | (p[25] & (g[24] | (p[24] & (g[23] | (p[23] & (g[22] | (p[22] & (g[21] | (p[21] & (g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))))))))))))))))));
assign c[28]=g[27] | (p[27] & (g[27] | (p[27] & (g[26] | (p[26] & (g[25] | (p[25] & (g[24] | (p[24] & (g[23] | (p[23] & (g[22] | (p[22] & (g[21] | (p[21] & (g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))))))))))))))))))))));
assign c[29]=g[28] | (p[28] & (g[27] | (p[27] & (g[27] | (p[27] & (g[26] | (p[26] & (g[25] | (p[25] & (g[24] | (p[24] & (g[23] | (p[23] & (g[22] | (p[22] & (g[21] | (p[21] & (g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))));
assign c[30]=g[29] | (p[29] & (g[28] | (p[28] & (g[27] | (p[27] & (g[27] | (p[27] & (g[26] | (p[26] & (g[25] | (p[25] & (g[24] | (p[24] & (g[23] | (p[23] & (g[22] | (p[22] & (g[21] | (p[21] & (g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))));
assign c[31]=g[30] | (p[30] & (g[29] | (p[29] & g[28] | (p[28] & (g[27] | (p[27] & (g[27] | (p[27] & (g[26] | (p[26] & (g[25] | (p[25] & (g[24] | (p[24] & (g[23] | (p[23] & (g[22] | (p[22] & (g[21] | (p[21] & (g[20] | (p[20] & (g[19] | (p[19] & (g[18] | (p[18] & (g[17] | (p[17] & (g[16] | (p[16] & (g[15] | (p[15] & (g[14] | (p[14] & (g[13] | (p[13] & (g[12] | (p[12] & (g[11] | (p[11] & (g[10] | (p[10] & (g[9] | (p[9] & (g[8] | (p[8] & (g[7] | (p[7] & (g[6] | (p[6] & (g[5] | (p[5] & (g[4] | (p[4] & (g[3] | (p[3] & (g[2] | (p[2] & (g[1] | (p[1] & (g[0] | (p[0] & c0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))));
endmodule

Multiplexer:

module mux4×1(
input a,
input b,
input c,
input d,
input s1,
input s0,
output y
);
wire s1d,s0d,ak,bk,ck,dk;
not (s1d,s1);
not (s0d,s0);
and (ak,s1d,s0d,a);
and (bk,s1d,s0,b);
and (ck,s1,s0d,c);
and (dk,s1,s0,d);
or (y,ak,bk,ck,dk);
endmodule

ALU1 bit:

module Alu(
input a,
input b,
input c,
input less,
input [3:0] operant,
output result
);
wire ak,bk,xab,ve,veya,toplam;
xor(ak,a,operant[3]);
xor(bk,b,operant[2]);
and(ve,ak,bk);
or(veya,ak,bk);
xor (xab,ak,bk);
xor (toplam,xab,c);
mux4×1 m(ve,veya,toplam,less,operant[1],operant[0],result);
endmodule

ALU significant bit:

module Alulast(
input a,
input b,
input c,
input less,
input [3:0] operant,
output sonuc,
output toplam,
output overflow
);
wire ak,bk,xab,ve,veya;
xor(ak,a,operant[3]);
xor(bk,b,operant[2]);
and(ve,ak,bk);
or(veya,ak,bk);
xor(xab,ak,bk);
xor(toplam,xab,c);
everflow t(a,b,toplam,overflow);
mux4×1 m(ve,veya,toplam,less,operant[1],operant[0],sonuc);
endmodule

ALU 32 bit

module Alu32(
input [31:0] a,
input [31:0] b,
input [3:0] operant,
output [31:0] s,
output zero
);
wire[31:1]c;
wire tplm,overflow;
carrybit e(a[30:0],b[30:0],operant[3],operant[2],operant[2],c);

Alu a00(a[0],b[0],operant[2],tplm,operant,s[0]),
a01(a[1],b[1],c[1],1′b0,operant,s[1]),
a02(a[2],b[2],c[2],1′b0,operant,s[2]),
a03(a[3],b[3],c[3],1′b0,operant,s[3]),
a04(a[4],b[4],c[4],1′b0,operant,s[4]),
a05(a[5],b[5],c[5],1′b0,operant,s[5]),
a06(a[6],b[6],c[6],1′b0,operant,s[6]),
a07(a[7],b[7],c[7],1′b0,operant,s[7]),
a08(a[8],b[8],c[8],1′b0,operant,s[8]),
a09(a[9],b[9],c[9],1′b0,operant,s[9]),
a10(a[10],b[10],c[10],1′b0,operant,s[10]),
a11(a[11],b[11],c[11],1′b0,operant,s[11]),
a12(a[12],b[12],c[12],1′b0,operant,s[12]),
a13(a[13],b[13],c[13],1′b0,operant,s[13]),
a14(a[14],b[14],c[14],1′b0,operant,s[14]),
a15(a[15],b[15],c[15],1′b0,operant,s[15]),
a16(a[16],b[16],c[16],1′b0,operant,s[16]),
a17(a[17],b[17],c[17],1′b0,operant,s[17]),
a18(a[18],b[18],c[18],1′b0,operant,s[18]),
a19(a[19],b[19],c[19],1′b0,operant,s[19]),
a20(a[20],b[10],c[20],1′b0,operant,s[20]),
a21(a[21],b[21],c[21],1′b0,operant,s[21]),
a22(a[22],b[22],c[22],1′b0,operant,s[22]),
a23(a[23],b[23],c[23],1′b0,operant,s[23]),
a24(a[24],b[24],c[24],1′b0,operant,s[24]),
a25(a[25],b[25],c[25],1′b0,operant,s[25]),
a26(a[26],b[26],c[26],1′b0,operant,s[26]),
a27(a[27],b[27],c[27],1′b0,operant,s[27]),
a28(a[28],b[28],c[28],1′b0,operant,s[28]),
a29(a[29],b[29],c[29],1′b0,operant,s[29]),
a30(a[30],b[30],c[30],1′b0,operant,s[30]);
Alulast a31(a[31],b[31],c[31],1′b0,operant,s[31],tplm,overflow);
assign zero=~(|s[31:0]);
endmodule

 

[user_asic]

Wow, way to go overboard there on the RTL

It would be great if you post comments in your code if you want others to learn from it. Its pretty useless for a beginner without comments. I can also guarantee that if you look back at your own code 2 months from now, you wont easily understand it.

 

[mrthn]

Re: ALU (arithmetic logic unit) design in schematic & in

yes you are rigth.i will restore my post soon. i will add the commens line by line thank you.
for now if you dont understand a part of this code,you can ask. it was hard to write this