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//This file is based on YACC ->alu.v 
 
 
 
/////////////////////////////////////////////////////////////////////
////  Author: Liwei                                              ////
////                                                             ////
////                                                             ////
////  If you encountered any problem, please contact :           ////
////  Email: mcupro@yahoo.com.hk or mcupro@opencores.org         ////
////                                                             ////
////  Downloaded from:                                           ////
////     http://www.opencores.org/pdownloads.cgi/list/mips789    ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
//// Copyright (C) 2006-2007 Liwei                               ////
////                         mcupro@yahoo.com.hk                 ////
////                                                             ////
////                                                             ////
//// This source file may be used and distributed freely without ////
//// restriction provided that this copyright statement is not   ////
//// removed from the file and any derivative work contains the  ////
//// original copyright notice and the associated disclaimer.    ////
////                                                             ////
//// Please let the author know if it is used                    ////
//// for commercial purpose.                                     ////
////                                                             ////
////     THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY     ////
//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   ////
//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS   ////
//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR      ////
//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,         ////
//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    ////
//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE   ////
//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        ////
//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  ////
//// LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT  ////
//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT  ////
//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         ////
//// POSSIBILITY OF SUCH DAMAGE.                                 ////
////                                                             ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
////                                                             ////
//// Date of Creation: 2007.8.1                                  ////
////                                                             ////
//// Version: 0.0.1                                              ////
////                                                             ////
//// Description:                                                ////
////                                                             ////
////                                                             ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
//// Change log:                                                 ////
////                                                             ////
/////////////////////////////////////////////////////////////////////
 
`define                ALU_ADD      12
`define                ALU_ADDU     13
`define                ALU_SUB      14
`define                ALU_SUBU     15
`define                ALU_SLTU     16
`define                ALU_SLT      17
`define                ALU_OR       18
`define                ALU_AND      19
`define                ALU_XOR      20
`define                ALU_NOR      21
`define                ALU_PA       22
`define                ALU_PB       23
 
module alu (a,b,alu_out,alu_func);
 
    input [31:0] a,b;
    output reg [31:0] alu_out;
    input [4:0]  alu_func;
 
    wire [31:0] c;
 
    reg [32:0] sum;
 
    always @(*)
    begin
        case (alu_func)
            `ALU_PA     : alu_out=a;
            `ALU_PB     : alu_out=b;
            `ALU_ADD    : alu_out=a+b;
            `ALU_SUB  ,
            `ALU_SUBU      : alu_out=a + (~b)+1;
            `ALU_OR     : alu_out=a | b;
            `ALU_AND     : alu_out=a & b;
            `ALU_XOR       : alu_out=a ^ b;
            `ALU_NOR        : alu_out=~(a | b);
            `ALU_SLTU : alu_out=(a < b)?1:0;
            `ALU_SLT :
            begin
                sum={a[31],a}+~{b[31],b}+33'h0_0000_0001;
                alu_out={31'h0000_0000,sum[32]};
            end
            default : alu_out=32'h0;
        endcase
    end
endmodule
 
/*
this file is based on YACC's alu.v
*/

Line No.	Rev	Author	Line
1	2	mcupro	`//This file is based on YACC ->alu.v`
2
3
4
5			`/////////////////////////////////////////////////////////////////////`
6			`//// Author: Liwei ////`
7			`//// ////`
8			`//// ////`
9			`//// If you encountered any problem, please contact : ////`
10			`//// Email: mcupro@yahoo.com.hk or mcupro@opencores.org ////`
11			`//// ////`
12			`//// Downloaded from: ////`
13			`//// http://www.opencores.org/pdownloads.cgi/list/mips789 ////`
14			`/////////////////////////////////////////////////////////////////////`
15			`//// ////`
16			`//// Copyright (C) 2006-2007 Liwei ////`
17			`//// mcupro@yahoo.com.hk ////`
18			`//// ////`
19			`//// ////`
20			`//// This source file may be used and distributed freely without ////`
21			`//// restriction provided that this copyright statement is not ////`
22			`//// removed from the file and any derivative work contains the ////`
23			`//// original copyright notice and the associated disclaimer. ////`
24			`//// ////`
25			`//// Please let the author know if it is used ////`
26			`//// for commercial purpose. ////`
27			`//// ////`
28			//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
29			`//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////`
30			`//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////`
31			`//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////`
32			`//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////`
33			`//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////`
34			`//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////`
35			`//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////`
36			`//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////`
37			`//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////`
38			`//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////`
39			`//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////`
40			`//// POSSIBILITY OF SUCH DAMAGE. ////`
41			`//// ////`
42			`/////////////////////////////////////////////////////////////////////`
43			`//// ////`
44			`//// ////`
45			`//// Date of Creation: 2007.8.1 ////`
46			`//// ////`
47			`//// Version: 0.0.1 ////`
48			`//// ////`
49			`//// Description: ////`
50			`//// ////`
51			`//// ////`
52			`/////////////////////////////////////////////////////////////////////`
53			`//// ////`
54			`//// Change log: ////`
55			`//// ////`
56			`/////////////////////////////////////////////////////////////////////`
57
58			`define ALU_ADD 12
59			`define ALU_ADDU 13
60			`define ALU_SUB 14
61			`define ALU_SUBU 15
62			`define ALU_SLTU 16
63			`define ALU_SLT 17
64			`define ALU_OR 18
65			`define ALU_AND 19
66			`define ALU_XOR 20
67			`define ALU_NOR 21
68			`define ALU_PA 22
69			`define ALU_PB 23
70
71			`module alu (a,b,alu_out,alu_func);`
72
73			`input [31:0] a,b;`
74			`output reg [31:0] alu_out;`
75			`input [4:0] alu_func;`
76
77			`wire [31:0] c;`
78
79			`reg [32:0] sum;`
80
81			`always @(*)`
82			`begin`
83			`case (alu_func)`
84			`ALU_PA : alu_out=a;
85			`ALU_PB : alu_out=b;
86			`ALU_ADD : alu_out=a+b;
87			`ALU_SUB ,
88			`ALU_SUBU : alu_out=a + (~b)+1;
89			`ALU_OR : alu_out=a \| b;
90			`ALU_AND : alu_out=a & b;
91			`ALU_XOR : alu_out=a ^ b;
92			`ALU_NOR : alu_out=~(a \| b);
93			`ALU_SLTU : alu_out=(a < b)?1:0;
94			`ALU_SLT :
95			`begin`
96			`sum={a[31],a}+~{b[31],b}+33'h0_0000_0001;`
97			`alu_out={31'h0000_0000,sum[32]};`
98			`end`
99			`default : alu_out=32'h0;`
100			`endcase`
101			`end`
102			`endmodule`
103
104			`/*`
105			`this file is based on YACC's alu.v`
106			`*/`

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[/] [mips789/] [branches/] [mcupro/] [verilog/] [mips_core/] [alu.v] - Blame information for rev 55