Initial commit

1553534-李帅-动态流水线/ALU.v

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+`timescale 1ns / 1ps
+//////////////////////////////////////////////////////////////////////////////////
+// Company: 
+// Engineer: 
+// 
+// Create Date: 2017/11/02 20:49:25
+// Design Name: 
+// Module Name: ALU
+// Project Name: 
+// Target Devices: 
+// Tool Versions: 
+// Description: 
+// 
+// Dependencies: 
+// 
+// Revision:
+// Revision 0.01 - File Created
+// Additional Comments:
+// 
+//////////////////////////////////////////////////////////////////////////////////
+
+
+module ALU (
+
+	// Outputs
+
+	Result,overflow,
+
+	// Inputs
+
+	ALUCode, A, B
+
+);
+
+
+
+	input [4:0]	ALUCode;				// Operation select
+
+	input [31:0]	A, B;
+
+
+
+	output reg [31:0]	Result;
+
+	output reg overflow;
+
+
+
+
+
+	reg signed [31:0] B_reg;
+
+
+
+	always @(B) 
+
+	begin
+
+		B_reg = B;
+
+	end
+
+
+
+
+
+// Decoded ALU operation select (ALUsel) signals
+
+  parameter	 alu_add=  5'b00000;
+
+  parameter	 alu_and=  5'b00001;
+
+  parameter	 alu_xor=  5'b00010;
+
+  parameter	 alu_or =  5'b00011;
+
+  parameter	 alu_nor=  5'b00100;//00100
+
+  parameter	 alu_sub=  5'b00101;
+
+  parameter	 alu_andi= 5'b00110;
+
+	parameter	 alu_xori= 5'b00111;
+
+	parameter	 alu_ori = 5'b01000;
+
+	parameter  alu_jr =  5'b01001;
+
+	parameter	 alu_beq=  5'b01010;
+
+  parameter	 alu_bne=  5'b01011;
+
+	parameter	 alu_bgez= 5'b01100;
+
+  parameter	 alu_bgtz= 5'b01101;
+
+  parameter	 alu_blez= 5'b01110;
+
+  parameter	 alu_bltz= 5'b01111;
+
+	parameter  alu_sll=  5'b10000;
+
+	parameter	 alu_srl=  5'b10001;
+
+	parameter	 alu_sra=  5'b10010;
+
+	parameter	 alu_slt=  5'b10011;
+
+  parameter	 alu_sltu= 5'b10100;
+
+   parameter    alu_mul=  5'b10101;
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+	wire [31:0] sum;
+
+	wire co;
+
+	reg Binvert;																														//Judge add or sub
+
+	reg [31:0] B_adder;																											//B in adder
+
+    reg [63:0] mulre;
+
+
+//Adder//
+
+	always @(*)
+
+		begin
+
+ 			Binvert=~(ALUCode==alu_add);
+
+ 			if(Binvert)
+
+ 				B_adder=~B+1;
+
+ 			else
+
+ 				B_adder=B;
+
+		end	
+
+
+
+	adder_32bits adder_32bits_ALU(																					
+
+	.a(A),.b(B_adder),.ci(0),.s(sum),.co(co));
+
+
+
+//Result//
+
+ always @(*)
+
+ 	begin
+
+ 		case(ALUCode)
+
+			 alu_add:		Result=sum;
+
+			 alu_and:		Result=A&B;
+
+			 alu_xor:		Result=A^B;
+
+			 alu_or:		Result=A|B;
+
+			 alu_nor:		Result=~(A|B);
+
+			 alu_sub:		Result=sum;
+
+			 alu_andi:	Result=A&{16'b0,B[15:0]};
+
+			 alu_xori:	Result=A^{16'b0,B[15:0]};
+
+			 alu_ori:		Result=A|{16'b0,B[15:0]};
+
+			 alu_jr:		Result=A;
+
+			 alu_sll:		Result=B<<A;
+
+			 alu_srl:		Result=B>>A;
+
+			 alu_sra:		Result=B_reg>>>A;
+
+			 alu_slt:		Result=(A[31]&&(~B[31]))||((A[31]~^B[31])&&sum[31]);
+
+			 alu_sltu:	Result=((~A[31])&&B[31])||((A[31]~^B[31])&&sum[31]);
+
+
+
+			 default:		Result=32'b0;
+
+ 		endcase
+
+
+
+		//judge overflow
+
+ 		if(co==sum[31])
+
+ 				overflow=1'b1;
+
+ 		else
+
+ 				overflow=1'b0;
+
+
+
+ 	end
+
+
+
+
+
+endmodule